tuuuaaaallllaaaattttiiiinnnn ......b u ris c r e e k mc fe e cr ek h e a t o n c r c r b a k e r c h...

prepared by

Tualatin River at Stafford Road Bridge

Bernie Bonn for

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Tualatin River at Haines Falls

2003Annual Report

Photo Credits:Tualatin River at Haines Falls, Stewart Rounds, USGS, Summer 2001

Tualatin River at Stafford Road Bridge, Tirian Mink, USGS, Summer 1998

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2222000000003333 AAAAnnnnnnnnuuuuaaaallll RRRReeeeppppoooorrrrtttt

Prepared by:Bernie Bonn

For:Clean Water Services, Watershed Management Division

In cooperation with:Oregon Water Resources Department, District 18 Watermaster

TTTTUUUUAAAALLLLAAAATTTTIIIINNNN RRRRIIIIVVVVEEEERRRR FFFFLLLLOOOOWWWW MMMMAAAANNNNAAAAGGGGEEEEMMMMEEEENNNNTTTT TTTTEEEECCCCHHHHNNNNIIIICCCCAAAALLLL CCCCOOOOMMMMMMMMIIIITTTTTTTTEEEEEEEECCCCoooommmmmmmmiiiitttttttteeeeeeee MMMMeeeemmmmbbbbeeeerrrrssss,,,, 2222000000003333 OOOOrrrrggggaaaannnniiiizzzzaaaattttiiiioooonnnnJan Miller, Chair Clean Water Services

Charlie Harrison City of Beaverton

Randy Smith City of Forest Grove

Bernadine Bonn Clean Water ServicesTom VanderPlaat

Mark Rosenkranz Lake Oswego Corporation

Chuck Kingston Joint Water Commission

Darrell Hedin, Secretary Oregon Water Resources Department

Wally Otto Tualatin Valley Irrigation District

Scott Porter Washington County Emergency Management

Chris Wayland Washington County Parks — Hagg Lake

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FULL NAME ACRONYM

Facilities

Springhill Pumping Plant SHPP

Wastewater Treatment Plant WWTP

Organization

Clean Water Services(formerly Unified Sewerage Agency)

CWS

Joint Water Commission JWC

Lake Oswego Corporation LOC

National Marine Fisheries Service NMFS

Oregon Department of Environmental Quality ODEQ

Oregon Department of Transportation ODOT

Oregon Water Resources Department OWRD

Tualatin Basin Technical Advisory Committee TBTAC

Tualatin Valley Irrigation District TVID

U.S. Army Corps of Engineers ACE

U.S. Bureau of Reclamation BOR

U.S. Geological Survey USGS

Water Resources Commission WRC

Water Quality Parameters

Dissolved Oxygen DO

Sediment Oxygen Demand SOD

Units of Measurement

Acre-Feet AC-FT

Cubic Feet per Second CFS

Micrograms per liter µg/L

Milligrams per Liter mg/L

Million Gallons per Day MGD

Pounds lbs

Pounds per Square Inch PSI

River Mile RM

Water Year WY

Other

Endangered Species Act ESA

Load Allocation LA

Total Maximum Daily Load TMDL

Wasteload Allocation WLA

Willamette Restoration Initiative WRI

FULL NAME ACRONYM

2003 Tualatin River Flow Management Report 3

TTTTAAAABBBBLLLLEEEE OOOOFFFF CCCCOOOONNNNTTTTEEEENNNNTTTTSSSS2003 Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

BackgroundBasin Description and Tualatin River Basin Map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Tualatin Basin Flow Management Technical Committee . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Member Reports for 2003Reservoir Status . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Clean Water Services . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Hagg Lake Monitoring Program . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Joint Water Commission/Joint Barney Commission . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Lake Oswego Corporation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Oregon Water Resources Department . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Tualatin Valley Irrigation District . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Water Quality Status Report . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

AAAAppppppppeeeennnnddddiiiicccceeeessssA. Flow Monitoring Sites—Hydrographs of Monthly Data

B. Natural Flow Determination—Data Tables and Hydrographs

C. Scoggins Reservoir (Henry Hagg Lake) Operations—Monthly Data Reports

D. Barney Reservoir Operations—Monthly Data Reports

E. Stream Gauge Records—Data Tables and Hydrographs of Monthly Data

F. Temperature Records—Data Tables and Graphs

G. Hagg Lake—Monitoring Results for 2003

H. Precipitation Records—

I. River Mile Indices—

4 2003 Tualatin River Flow Managment Report

2222000000003333 SSSSUUUUMMMMMMMMAAAARRRRYYYYThis is the sixteenth year that the Tualatin River Flow Management Technical Committee has prepared an annual report documenting the flow management of the Tualatin River. Members of the committee include Clean Water Services (CWS), Tualatin Valley Irrigation District (TVID), Joint Water Commission (JWC), Lake Oswego Corporation (LOC) and Oregon Water Resources Department (OWRD).

Water management in 2003 was largely routine. The reports and graphs that follow describe the activities of the committee members, river flows, and water allocations. Some of the highlights include

• Both Barney and Scoggins Reservoirs filled.

• All partners (Clean Water Services, Tualatin Valley Irrigation District and the cities of Beaverton, Hillsboro and Forest Grove and Lake Oswego Corporation) received their normal water allocations from the reservoirs.

• Concerns about installation vulnerability continued.

• Dissolved oxygen levels and pH levels in the mainstem Tualatin River at RM 24.5 met water quality standards during the entire low-flow period (May through mid-December). At RM 3.4 (Oswego Dam), there were 27 days between May 1, 2003 and November 15, 2003 when dissolved oxygen lev-els did not meet water quality standards.


BBBBAAAACCCCKKKKGGGGRRRROOOOUUUUNNNNDDDDBBBBaaaassssiiiinnnn DDDDeeeessssccccrrrriiiippppttttiiiioooonnnnThe Tualatin River Basin comprises an area of 712 square miles situated in the Northwest corner of Oregon and is a subbasin of the Willamette River. The headwaters are in the Coast Range and flow in a generally east-erly direction to the confluence with the Willamette River. The basin lies almost entirely in Washington County. (See map below)

The Tualatin River is about 80 miles long and changes dramatically from its headwaters to its mouth. The mountain or headwater reach (upstream of RM 55) is narrow (about 15 ft) and steep with an average slope of about 74 ft/mi. The meander reach (RM 55–33) is wider with an average slope of about 1.3 ft/mi. The reser-voir reach (RM 33–3.4) is very wide (up to 150 ft) and has an estimated slope of only 0.08 ft/mi. It includes several deep pools. Travel times through this reach are very long. The slow movement of the water causes this reach to act much like a lake. In the riffle reach (RM 3.4–0), the Tualatin River flows through a short reservoir section and then drops into a narrow gorge near the City of West Linn before it enters the Willamette River just upstream of Willamette Falls. The average slope in this reach is 10 ft/mi.

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Beaverton

Tualatin

Sherwood

Scholls

Farmington

Hillsboro

Banks

Cornelius

Dilley

ForestGrove

NorthPlains

CherryGrove

5

205

Basin boundary

C L A C K A M A S

C O L U M B I A WA S H I N GT O N

T I L L A M O O K

YA M H I L L

Scoggin

Creek

HenryHaggLake

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Beaverton

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RIVER

O R E G O N

WA S H I N GT O N

123°00' 122°37'30''122°45'123°15'123°22'30''

45°45'

45°30'

45°15'Base modified from U.S. Geological Survey

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5 10 MILES

Portland

O R E G O N

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TUALATIN

26

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WestLinn

1:100,000 topographic quadrangles, 1978–84 Designated urban growth area from Metro, 1998 RM10

River mile

M U LT N O M A H

Tualatin River Basin


Water sources to the Tualatin RiverPrecipitation: Seasonal rainfall accounts for most of the flow in the Tualatin Basin; stream flow from snowmelt is minimal. The amount of rainfall ranges from 110 inches on the eastern slopes of the Coast Range to 37 inches in the southeastern area of the drainage basin. Peak months for rainfall are November through February while the driest months are normally June through October. The peak streamflow month is usually February, and the lowest streamflow month is August.

Barney Reservoir: Barney Reservoir is located on the Middle Fork of the North Fork of the Trask River. It has a capacity 20,000 acre-feet and stores water for the Cities of Beaverton, Hillsboro and Forest Grove, Clean Water Services, and Tualatin Valley Water District. Water released from Barney Reservoir enters the Tualatin River at RM 78 via an aqueduct over a low Coast Range divide and via a pipeline. Water is released during the summer low-flow season to supplement shortages in natural flow.

Scoggins Reservoir: Scoggins Creek enters the Tualatin River at RM 60.0. In the early 1970's the Bureau of Reclamation built an earthen dam on Scoggins Creek. Scoggins reservoir (Henry Hagg Lake) has an active storage capacity of 53,640 acre-feet. It is a multipurpose facility with contracted water for irriga-tion, municipal and industrial, and water quality uses. Recreation is a major activity during the summer months on the reservoir. During the winter it serves as a flood control structure.

Clean Water Services: Clean Water Services (CWS) provides sanitary and stormwater services to the urban areas of Washington County. CWS has two major wastewater treatment plants (WWTPs) that have permits to discharge water into the Tualatin River. The Rock Creek WWTP discharges an average of 41 cfs (27 MGD) at RM 38.1; the Durham WWTP discharges an average of 26 cfs (17 MGD) at RM 9.4. CWS also releases storage water from Scoggins Reservoir for flow augmentation during the seasonal low flow periods. The goal is to maintain 150 cfs (100 MGD) at the Tualatin River at Farmington Road Bridge gauge (RM 33.3).

Tualatin Valley Irrigation District: Tualatin Valley Irrigation District (TVID) is the agricultural water service agency for the area and serves approximately 20,000 acres of irrigated cropland. TVID operates the Patton Valley Pump Station near RM 5 on Scoggins Creek which can divert water via a low-pressure pipeline into the upper Tualatin River above the city of Gaston (outfalls at RM 63.2 and RM 64). This water is used to serve irrigators upstream of the Scoggins confluence (RM 60.0).

Water diversions from the Tualatin RiverCherry Grove Intake (RM 73.2): The City of Hillsboro diverts water for municipal and industrial uses at the Cherry Grove Intake.

Springhill Pumping Plant (RM 56.3): The Springhill Pumping Plant (SHPP) is the largest diversion facility on the river. It is operated jointly by the Tualatin Valley Irrigation District (TVID) and the Joint Water Commission (JWC). TVID delivers water from SHPP to about 12,000 acres of irrigated cropland via a pressure pipeline. TVID has a pumping capacity of approximately 90 MGD (140 cfs) at the SHPP. JWC delivers water from SHPP to the cities of Beaverton, Hillsboro, and Forest Grove. JWC has a pump-ing capacity of approximately 60 MGD (90 cfs) at the SHPP. Both TVID and JWC have natural flow water rights that are used when flows are high; they release contracted stored water from Scoggins and Barney Reservoirs to augment declined natural flow in the summer.

Irrigation withdrawals: Water is obtained directly from the Tualatin River for irrigation purposes by members of the Wapato Improvement District (Wapato Lake), members of the TVID, and irrigators with natural flow water rights. About 5,000 acres of cropland served by TVID is irrigated with water obtained directly from the Tualatin River.

Lake Oswego Canal Diversion: The Lake Oswego Corporation (LOC) diverts a portion of the Tualatin flow into the Lake Oswego Canal at RM 6.7. A headwork structure regulates the flow into this mile long


canal that feeds into Lake Oswego. The water is used to generate power below the dam at the east end of Lake Oswego. The Lake Oswego Corporation has a natural flow water right for 57.5 cfs (priority date: 1906) and has 500 acre-feet of contracted stored water for consumptive uses from Hagg Lake. At RM 3.4, a combination diversion dam/fish ladder structure is used during low flow periods to elevate the Tualatin River enough to divert the flow into the canal. During most of year, river elevation is adequate to allow diversion of the LOC water right; in the summer, however, flash boards are installed to increase the water level. This dam raises the Tualatin 2–3 feet which affects the water surface elevation for about 25 river miles.

TTTTuuuuaaaallllaaaattttiiiinnnn RRRRiiiivvvveeeerrrr FFFFlllloooowwww MMMMaaaannnnaaaaggggeeeemmmmeeeennnntttt TTTTeeeecccchhhhnnnniiiiccccaaaallll CCCCoooommmmmmmmiiiitttttttteeeeeeeeThe Tualatin River Flow Management Technical Committee provides a mechanism for the coordination and management of flow in the Tualatin River. The members of the committee are technical staff with detailed knowledge of the specific characteristics of flow in this river. The committee meets monthly from February through November. Meetings focus mainly on the review of the hydrographs and current status of the reservoirs. In addition, a variety of other water issues and any problems are discussed. Each mem-ber updates the committee on any changes that could impact the flow management of the Tualatin. Min-utes are recorded and reviewed at the next meeting.

Data collection systemA coordinated information system was developed to provide flow information to all members of the com-mittee. Because use or release of water by any one of the entities can impact the other users, coordination of flow information is an important aspect of the committee's work. The data are collected by field staff from the cooperating entities or from the Corps of Engineers via telemetry. A system of gauging stations, precipitation and other flow monitoring equipment has been developed during the past several years to monitor the flows on the Tualatin and the major tributaries. Significant releases and diversions are also monitored. The data collected is relayed to the District 18 Watermaster office on a weekly basis. Hydro-graphs (Appendix A) which show the previous year and current year's data, were developed to identify and address problems related to the flow. Rainfall is shown as total weekly accumulation and three sta-tions are currently being graphed.

A second set of hydrographs (Appendix B) was developed to show the available natural flow at various points on the mainstem of the Tualatin. These graphs depict the volume of natural flow by taking the mea-sured flow and subtracting the storage flow. The storage flow is calculated on the releases from Scoggins (Hagg Lake) and Trask (Barney) Reservoirs. An evaporation loss factor reduces the storage flow and is based on an estimated loss of 0.25 percent of the flow per river mile. The main purpose for calculation of the natural flow is to determine when natural flow is no longer adequate in various river reaches. The key point in the analysis of the graphs is to determine when the reach does not have adequate water. When the natural flow graphs show flows less than zero, the reach does not have adequate water to serve all users and regulation is needed. Regulation is handled by the local Watermaster office and is done on a priority basis as required by Oregon Water Law.

An expanding, on-going flow monitoring system continues to provide valuable information for the man-agement of stored water and natural flow availability in the basin. It also makes the calculation of pollut-ant loads possible, which is necessary to the Total Maximum Daily Load program (TMDL). New monitoring includes temperature as well as flow at some sites. As water quality issues have come to the forefront, the monitoring system has been an excellent example of interagency cooperation.


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Both Scoggins and Barney Reservoirs filled in 2003. The fill curves for 2003 and the reservoir filling his-tories are shown below.

10/1

10/1

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Rule Curve Water Years1981-2000, 2002

Water Year 2003

Water Year 2001

10/1

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1/29

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Water Year 2001

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CCCCLLLLEEEEAAAANNNN WWWWAAAATTTTEEEERRRR SSSSEEEERRRRVVVVIIIICCCCEEEESSSSBY JAN MILLER, CLEAN WATER SERVICESWater is released by Clean Water Services (CWS) from Scoggins and Barney reservoirs to improve water quality in the Tualatin River and to provide flexibility to the wastewater treatment plants (WWTP) relative to their ammonia discharge limits. When downstream dissolved oxygen levels are high, the WWTP can release slightly more ammonia. This provides the WWTP with windows of time when maintenance can be done. The primary water quality issue in the lower Tualatin River is dissolved oxygen. The most critical time period starts in mid-September when algal growth is reduced due to lower light conditions. This reduces the amount of oxygen produced by algae in the river. During the earlier parts of the summer, the oxygen produced by algae effectively meets the needs of the decaying substances in the river sediment (sediment oxygen demand). Once algal production is reduced, the sediment oxygen demand can deplete the dissolved oxygen concentration in the river. By increasing the flow of water when the algal oxygen production decreases, the impact of sediment oxygen demand can be minimized because the water moves past the sediment faster.

2222000000003333 WWWWaaaatttteeeerrrr AAAAvvvvaaaaiiiillllaaaabbbbiiiilllliiiittttyyyy aaaannnndddd RRRReeeelllleeeeaaaasssseeeessssThe goal for the summer of 2003 was to release water very conservatively to minimize the need to buy water at the end of the season. This was based on the lessons learned in previous years when buying water at the end of the summer of 2000 resulted in an additional 2658 acre-feet of water being deducted from the CWS allocation in the drought summer of 2001. Although Scoggins Reservoir was 50% full in 2001, CWS only received 27% of its normal allocation (3429 acre-feet) that year.

Clean Water Services’ allocation from Scoggins Reservoir is 16,900 acre-ft, provided that the reservoir fills. Of this amount, 4282 acre-ft is ascribed to natural flow for the months of May, June, October and November. Clean Water Services released water from Scoggins Reservoir starting on July 11, 2003 and continued until November 17, 2003 when the fall rains raised the flow at Farmington gauge (river mile 33.3) to 367 CFS. This left a reserve of 849 Acre-Feet that would have been used if the river flows did not stay above 350 CFS. This water was not needed.

Clean Water Services owns 10% of the 20,000 acre-foot Barney Reservoir. Each year the Joint Water Commission decides how much water is to be released for the Department of Fish and Wildlife. This, plus the dead pool, is subtracted from the available water and the remainder is allocated to the owners. Clean Water Services initiated a constant rate of release of 14 CFS from Barney Reservoir on August 15, 2003. It was maintained it until October 14, 2003 when Clean Water Services had exhausted its allocation of 1,742 acre-feet.

The amount of water available to and released by Clean Water Services during 2003 is summarized in the following table.

CLEAN WATER SERVICES WATER AVAILABILITY AND USE

ReservoirMaximum Available

(acre-ft)Available(acre-ft)

Total CWS Release(acre-ft)

Scoggins Reservoir

Storage 12,618 12,618 11,765

Natural flow portion (credit) 4,282 — 0

Purchased — — 0

Barney Reservoir

Storage 2,000 1,667 1,667

Summer storage — 75 75

Purchased — — 0

Total 13,507


Natural flow creditFor the months of May, June, October and November, if the natural flow in the Tualatin River measured at West Linn is less than the target flow, CWS receives a natural flow credit of up to 4282 acre-ft. Natural flow is calculated as the actual measured flow minus the CWS released flow. The table below shows that CWS was not entitled to a natural flow credit in 2003 because the natural flow at West Linn exceeded the target flow.

Details of 2003 CWS water releases

BUREAU OF RECLAMATION NATURAL FLOW CREDIT

Month

Mean Daily Measured Flow

at West Linn(cfs)

Mean Daily CWS Release

(cfs)

Calculated Natural Flow at

West Linn(cfs)

Target Natural Flow at West

Linn(cfs)

CWS Natural Flow Portion (max credit)(cfs) [acre-ft]

CWS Natural Flow Credit

(cfs)

May 869 0 869 85 13 [798] 0

June 294 0 294 140 21 [1250] 0

October 304 55 249 95 16 [984] 0

November 509 55.3 454 110 21 [1250] 0

CLEAN WATER SERVICES WATER RELEASE SCHEDULE

Month

Scoggins Release Barney ReleaseTotal Release

(acre-ft)Average Release*

(cfs)Volume(acre-ft)

DaysVolume(acre-ft)

Dates

May 0 0 0 0 0 0

June 0 0 0 0 0 0

July 688 21 0 0 688 16.5

August 3,384 31 492 18 3,876 63.0

September 2,834 30 833 30 3,667 61.6

October 2,995 31 417 15 3,412 55.0

November 1-17 1,864 17 0 0 1,864 55.3

Total release 11,765 130 1,742 63 13,507 52.4

*Average release is calculated only for days with water releases.


FFFFlllloooowwww TTTTaaaarrrrggggeeeettttssssClean Water Services began actively managing the release of its stored water in 1987. Prior to 1987, the water was released according to the contract with the BOR based on minimum flows at West Linn (RM 1.8). Beginning in 1987, Clean Water Services released its water with the goal of maintaining a monthly average of 150 CFS at the Tualatin River at Farmington (RM 33.3). Work by the US Geological Survey in the early 1990’s indicated that it was more important to have higher flows in the fall to maintain dissolved oxygen levels rather than in the early summer to prevent algal blooms. The flow goals were changed to maintaining 120 cfs in the early summer, 150 cfs in August and 180–200 cfs from September until the winter flows start. (The onset of winter flows is assumed if either of the following occur for the Tualatin River at Farmington: the seven-day median of the daily mean flow values exceeds 350 cfs, OR the daily mean flow exceeds 1,000 cfs.)

FLOW TARGETS AND MEASURED FLOWS FOR TUALATIN RIVER AT FARMINGTON (RM 33.3)

Month

Current Farmington Flow Targets Measured Flows

Minimum(cfs)

Mean(cfs)

Minimum(cfs)

Mean(cfs)

Maximum(cfs)

May 120 120 235 596 1,546

June 120 120 130 180 229

July 120 120 107 127 151

August 120 150 121 156 289

September 120 180 123 160 316

October 120 180 152 200 316

November 120 180 149 178 367


HHHHiiiissssttttoooorrrriiiiccccaaaallll ppppeeeerrrrssssppppeeeeccccttttiiiivvvveeee Clean Water Services releases from Scoggins Reservoir are summarized below.

Clean Water Services releases water from Barney Reservoir at a constant rate during the late summer to supplement the water released from Scoggins Reservoir. The following table summarizes the releases of water from Barney Reservoir.

CLEAN WATER SERVICES — SCOGGINS RESERVOIR RELEASES

Year Start Date End DateTotal

Release Days

Total Release(acre-ft)

Average per Release Day

(cfs)

Minimum Monthly Flow at Farmington (RM 33.3)

(cfs)

1987 6/9 11/30 175 16,722 48.2 138

1988 7/2 11/4 126 15,071 60.3 149

1989 6/27 11/15 141 16,586 59.3 158

1990 7/12 11/1 113 11,889 53.0 172

1991 7/12 11/4 116 13,024 56.6 181

1992 6/5 11/19 168 12,730 38.2 138

1993 7/3 12/1 150 11,486 38.6 154

1994 6/21 10/27 129 10,917 42.7 137

1995 6/24 11/8 138 9,824 35.9 174

1996 7/27 11/10 114 10,952 48.4 205

1997 7/4 10/2 91 6,716 37.2 202

1998 8/12 11/7 87 9,407 54.5 175

1999 7/27 11/12 109 12,001 55.5 188

2000 7/21 11/27 130 15,275 59.2 174

2001 9/25 11/14 50 2,403 24.0 114

2002 6/12 11/9 151 12,618 42.0 103

2003 7/11 11/17 130 11,765 52.4 107

CLEAN WATER SERVICES — BARNEY RESERVOIR RELEASES

Year Start Date End DateTotal

Release(acre-ft)

Daily Release Rate(cfs)

Comment

1998 7/12 8/27 2,779 24.6 extra water released to draw down reservoir

1999 9/1 10/19 1,025 10 10 cfs also released 6/4–6/10

2000 9/8 10/23 1,461 18 —

2001 9/18 10/29 1,416 171000 acre-ft purchased in addition to allocationreservoir did not fill;4,000 acre-ft held in reserve

2002 8/26 10/24 1,667 14 —

2003 8/15 10/14 1,742 14 —


HHHHAAAAGGGGGGGG LLLLAAAAKKKKEEEE MMMMOOOONNNNIIIITTTTOOOORRRRIIIINNNNGGGG PPPPRRRROOOOGGGGRRRRAAAAMMMMBY BERNIE BONN FOR CLEAN WATER SERVICES

OOOOvvvveeeerrrrvvvviiiieeeewwwwA five-year comprehensive Hagg Lake monitoring program was initiated in August of 1999. The monitor-ing program is designed to provide information about lake water sources and sinks, including inflow vol-ume, discharge volume, and evaporative losses; nutrient concentrations in the lake and its tributaries; concentrations of petroleum hydrocarbon compounds in the lake; bacteria concentrations in the lake and its tributaries; and biological communities (phytoplankton, zooplankton, and macroinvertebrate) in the watershed. This information will be used to develop water and nutrient budgets for the lake and character-ize the water quality of Hagg Lake and determine its trophic level.

MMMMoooonnnniiiittttoooorrrriiiinnnnggggSamples are collected from the deepest location in Hagg Lake and from the three main tributaries to the lake, Scoggins, Sain, and Tanner Creeks. The program is conducted year-round, although the sampling frequency and analyses vary with the season. Lake samples are collected twice a month from May to October and once a month during the remainder of the year. Tributaries are sampled monthly. Tributary samples collected between May and October represent baseflow conditions; those collected from Novem-ber to April target storm events. The monitoring schedule and actual sampling for 2003 is shown in the table below.

HAGG LAKE MONITORING — 2003[First value is the number of actual dates with analytic results; value in parenthesis is the number that was scheduled]

Field DataNutrient

ConcentrationChlorophyll a

SuspendedSolids

Total PetroleumHydrocarbon

Bacteria PhytoplanktonZooplankton Macroinver-

tebratesID Length

Hagg Lake

January 1 (1) 1 (1) 1 (1) — — 1 (1) 1 (1) 1 (1) — —

February 1 (1) 1 (1) 1 (1) — — 1 (1) 1 (1) 1 (1) — —

March 1 (1) 1 (1) 1 (1) — — 1 (1) 1 (1) 1 (1) — —

April 1 (1) 1 (1) 1 (1) — — 1 (1) 1 (1) 1 (1) 1 (1) —

May 2 (2) 2 (2) 2 (2) — 1 (1) 2 (2) 2 (2) 2 (2) 1 (2) —

June 2 (2) 2 (2) 2 (2) — — 2 (2) 2 (2) 2 (2) 1 (2) —

July 2 (2) 2 (2) 2 (2) — 0 (1) 2 (2) 1 (2) 2 (2) 1 (2) —

August 2 (2) 2 (2) 2 (2) — — 2 (2) 2 (2) 2 (2) 0 (2) —

September 1 (2) 1 (2) 1 (2) — 0 (1) 1 (2) 1 (2) 1 (2) 1 (2) —

October 2 (2) 2 (2) 2 (2) — 0 (1) 2 (2) 2 (2) 2 (2) 1 (2) —

November 0 (1) 0 (1) 0 (1) — — 0 (1) 0 (1) 0 (1) — —

December 1 (1) 1 (1) 1 (1) — — 1 (1) 1 (1) 1 (1) — —

Tributaries (Scoggins, Sain and Tanner Creeks)

January 1 (1) 1 (1) — 1 (1) — 1 (1) — — — —

February 1 (1) 1 (1) — 1 (1) — 1 (1) — — — —

March 1 (1) 1 (1) — 1 (1) — 1 (1) — — — —

April 1 (1) 1 (1) — 1 (1) — 1 (1) — — — —

May 1 (1) 1 (1) — 1 (1) — 1 (1) — — — —

June 1 (1) 1 (1) — 1 (1) — 1 (1) — — — —

July 1 (1) 1 (1) — 1 (1) — 1 (1) — — — —

August 1 (1) 1 (1) — 1 (1) — 1 (1) — — — —

September 1 (1) 1 (1) — 1 (1) — 1 (1) — — — 0 (1)

October 1 (1) 1 (1) — 1 (1) — 1 (1) — — — —

November 2 (1) 2 (1) — 2 (1) — 1 (1) — — — 1 (0)

December 1 (1) 1 (1) — 1 (1) — 1 (1) — — — —


All samples are collected by JWC, except macroinvertebrate samples which are collected by Clean Water Services. JWC also collects all field measurements and weather conditions. Most of the chemical analyses are done by the Bureau of Reclamation laboratory in Boise, Idaho. JWC makes, arranges and pays for bac-teria testing. Clean Water Services arranges and pays for macroinvertebrate, zooplankton, phytoplankton, and total petroleum hydrocarbon analyses.

Additional information about Hagg Lake is also available.

• OWRD maintains gauges on the tributaries that flow into Hagg Lake. • The USGS maintains a gauge on Scoggins Creek downstream of Scoggins Dam. • TVID is responsible for flow releases and maintains records of reservoir height and discharge. They

also collect weekly data for water turbidity, transparency, and temperature. In addition, CWS collects weekly water samples immediately downstream of the discharge from Scoggins Dam during the sum-mer; these samples are analyzed for nutrients and major ions by Clean Water Services laboratory.

• The Washington County Parks Department collects weekly samples at key sites around Hagg Lake; these samples are sent to the Oregon State Health Department for bacteria analysis.

RRRReeeessssuuuullllttttssss ffffoooorrrr 2222000000003333Hagg Lake began to thermally stratify in April this year and continued to be stratified through October (see graphs with yellow or pink backgrounds on the opposite page). Dissolved oxygen levels in the hypolimnion (the lower level of the lake) fell sharply from June through July. By August, the bottom of the lake was nearly anoxic (see graphs with pink backgrounds on the opposite page).

Once the oxygen is depleted, denitrification can occur which produces ammonia. There was concern that if the intake structure in the reservoir tapped into the hypolimnion, ammonia would be discharged into Scoggins Creek. If the ammonia concentrations were high enough, several problem could result.

• It could be toxic to fish; • Nitrification of the ammonia could deplete oxygen levels in Scoggins Creek;• If the water reaching JWC’s drinking water plant at Springhill contained significant ammonia, it

would consume extra chlorine in the disinfection process, causing an increase in costs and in the con-centration of choramines in the treated water.

Sporadic ammonia detections occurred throughout the winter and spring, but these were near the detection limit. Ammonia remained at low or undetectable concentrations until early October when it was 0.25 mg/L in the deepest sample. By the late October when the next sample was collected, the level was 0.08 mg/L; the lake was still stratified, however. By the time the next sample was collected in December, the lake had turned over and was well mixed. At that time, ammonia concentrations at all lake depths were low (0.02 mg/L as N or less).

Ammonia production in the lower parts of Hagg Lake probably did not cause significant problems. Flows in the Tualatin River were high enough that the ammonia was diluted before it reached the intake for JWC.

DATA QUALITY NOTE: Preliminary review of the field data by the U.S. Geological Survey indicates that there may be some intermittent problems with the quality of the dissolved oxygen data for 2003.


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JJJJOOOOIIIINNNNTTTT WWWWAAAATTTTEEEERRRR CCCCOOOOMMMMMMMMIIIISSSSSSSSIIIIOOOONNNN &&&& JJJJOOOOIIIINNNNTTTT BBBBAAAARRRRNNNNEEEEYYYY CCCCOOOOMMMMMMMMIIIISSSSSSSSIIIIOOOONNNNBY CHUCK KINGSTON, WATER SUPPLY & WATER TREATMENT PLANT SUPERVISORJWC provides potable water to its member agencies: the Cities of Hillsboro, Forest Grove, and Beaverton, and to the Tualatin Valley Water District. About 250,000 people receive at least a portion of their water from JWC. JWC's water production averages approximately 25 million gallons per day. During the peak periods of the summer, production has reached 58 million gallons per day.

JWC's water treatment plant is supplied water from the nearby Tualatin River. Water is pumped from an intake facility that was constructed by the Bureau of Reclamation and is shared with the Tualatin Valley Irrigation District (TVID). Flows in the Tualatin River are supplemented from water that is impounded behind Scoggins Dam (Hagg Lake) and water that is stored in Barney Reservoir. Scoggins Dam is owned by the Bureau of Reclamation and is operated by TVID. The Barney Joint Operating Commission (BJOC) is the owner of Barney Reservoir, which is formed behind the Eldon Mills Dam on the Trask River. The BJOC includes all members of the JWC as well as Clean Water Services.

The JWC water treatment plant uses conventional, dual media filtration, along with disinfection to pro-duce potable water. Treated water is pumped from the plant to the member agencies either directly through finished water pipelines leaving the plant or via the Fern Hill Reservoir. Fern Hill Reservoir is a 20 million gallon covered, concrete tank located about one-third mile to the east of the water treatment plant. The JWC finished water pipelines include master meter and pressure reducing stations at the con-nection points to the member agencies.

This year JWC continued the cooperative water quality monitoring project with the BOR and CWS. The data collected is a model for other reservoirs and will greatly enhance the picture we have of this reservoir as it continues to meet the M & I, irrigation and recreation needs of the future.

JWC began a concerted effort to better track and capture the water released from the two reservoirs this year. I would again like to thank Jean Woll of the Hillsboro—JWTP staff for her magnificent work at making this effort through the use of compounded spreadsheets. Her work gives us a tool that we didn't have before and takes what was a monument to objectivity and puts it closer to reality. A summary table for 2003 is shown below.

We appreciate the efforts of our partners on the Flow Management Committee and extend our thanks for all of their involvements. The communication and coordination that comes from this committee is invalu-able.

WATER USE ALLOCATIONS (ALL VALUES IN ACRE-FEET)

JWC Partner

Scoggins Reservoir Barney Reservoir Purchased Water Shared Natural

Flow

Total UseStarting

BalanceEnding Balance

UseStarting Balance

InflowEnding Balance

Use StorageNatural

Flow

Hillsboro 5,000 1,083 3,917 5,127 243 3,855 1,515 0 0 4,342 9,773

Forest Grove 4,500 2,408 2,092 413 20 277 156 0 0 99 2348

Beaverton 4,000 0 4,000 3,556 168 2,041 1,683 0 0 186 5,869

TVWD — — — 5,789 274 0 6,063 582 311 110 7,066

Total 13,500 3,491 10,009 14,886 705 6,173 9,418 582 311 4,737 25,056


LLLLAAAAKKKKEEEE OOOOSSSSWWWWEEEEGGGGOOOO CCCCOOOORRRRPPPPOOOORRRRAAAATTTTIIIIOOOONNNNBY MARK ROSENKRANZ, WATER RESOURCE SPECIALIST

IIIInnnnttttrrrroooodddduuuuccccttttiiiioooonnnnThe Lake Oswego Corporation (LOC), a non-profit organization, owns and manages Oswego Lake, a 168-hectare (403 acre) reservoir located 10 miles south of Portland, Oregon. LOC was formed in 1942 when the Oregon Iron and Steel Company, then owner of the land around the Lake, deeded to LOC the land, three dam structures, and all water rights. The original dam was constructed in 1871 and later upgraded in 1921. Oswego Lake is a private water body whose primary water right is hydropower genera-tion. Secondary uses include irrigation, aesthetic viewing, contact recreation, fishing, and boating.

OOOOsssswwwweeeeggggoooo LLLLaaaakkkkeeee aaaannnndddd WWWWaaaatttteeeerrrrsssshhhheeeedddd MMMMoooorrrrpppphhhhoooollllooooggggyyyyThe original natural lake, called Waluga, was formed 10,000 years ago by the Missoula glacial floods, altering the old Tualatin River channel. Today, the Lake is comprised of three basins: West Bay, the Main Lake, and Lakewood Bay. There are also two shallow, man-made canals, Blue Heron Canal and Oswego Canal (inlet). Oswego Canal is the 2.4-km conduit from the Tualatin River (RM 6.7). The total surface area of these waterbodies is 1.63 km2 (403 acres). Total volume of the Lake is 12.7 x 10+6 m3 (10,300 acre-feet). The shoreline length, including bays and canals, is 18.62 km (11.56 mi.). Oswego Lake has a 5.08-km (3.15-mi) fetch and a narrow 0.56-km (0.34-mi) width. The hydraulic residence time is 390 days.

Oswego Lake's two watersheds include the natural, 7.5-mi2 urban basin around the Lake (10:1 watershed to lake-area ratio) and the larger 700-mi2 Tualatin River basin (1,000:1 ratio) when the LOC Headgate is opened. Major inflows from the watershed include Springbrook Creek, Lostdog Creek, Blue Heron Creek, and 60+ storm drains from the City of Lake Oswego.

LLLLOOOOCCCC WWWWaaaatttteeeerrrr RRRRiiiigggghhhhttttssssHydro PowerThe primary hydro power water right is 57.5 cubic feet per second (cfs) obtained in 1906 that allows year around diversion. To guarantee this flow during the dry season, LOC owns and operates a “flaps dam” located downstream of the Oswego Canal (RM 3.4). Flaps are erected on an “as needed” basis. In 2003, 11 out of 45 flaps were erected on 6/11, 10 on 6/30 and 8 on 7/19, and 11 on 8/18 for a total of 30. Ten flaps were lowered on 9/4, 14 on 10/8 and the remaining 16 on 10/16.

IrrigationThere is also a 1974 irrigation water right of 500 acre-feet for the March–October irrigation season. LOC proved up their irrigation water right in 2000 with the Bureau of Reclamation and the Oregon Water Resources Department. The largest irrigator on the Lake is the Lake Oswego Country Club (approxi-mately 175 acre-feet). Due to the lack of water, the Bureau of Reclamation reduced LOC's water right to 383 acre-feet.

Maintenance/EvaporationThe third water right is the 1985 maintenance/evaporation water right of 3.36 cfs. This water can be diverted between September 16th and July 30th.


2222000000003333 OOOOsssswwwweeeeggggoooo LLLLaaaakkkkeeee MMMMaaaannnnaaaaggggeeeemmmmeeeennnntttt SSSSuuuummmmmmmmaaaarrrryyyyWater quality improvements and safety are the top priorities for LOC. The goal for the annual LOC Water Quality Management Plan is to reduce Cyanobacteria productivity and maximize the aesthetic values of the Lake by focusing on flow management, water quality treatment, and macrophyte issues.

Lake Water QualityIn 2003, the Oswego Lake water quality-monitoring program included six sites where water clarity, nutri-ent content, biological productivity, and chemical profiles were recorded. The year-round monitoring was conducted weekly with more emphasis during the summer season, June–September.

2003 OSWEGO LAKE WATER QUALITY SUMMARY AVERAGES

Algae: The dominant alga in 2003 were various species of Cyanophyta. In previous years Gleotrichia dominated the system, creating surface mats. Although dominated by Cyanophytes, the algae species have become more diverse and change throughout the summer. The mat-forming Gleoetrichia, which was once the dominant alga in the lake, is present but in very small numbers.

Macrophytes: Macrophytes continue to be controlled by spring herbicide treatments that target non-native plants in Oswego Canal, Blue Heron Canal, Lakewood Bay and Half Moon Bay. Lakewood Bay was historically dominated by the non-native plant Potamogeton crispus (Curly-leaf Pondweed) resulting in impaired navigation but annual spring treatments to the bay have dramatically reduced the plant prob-lem. Oswego Canal and Blue Heron Canal have a small, pioneering population of Egeria densa (Brazilian elodea) that was controlled effectively with herbicides and physical removal methods.

Dissolved Oxygen (DO): Low DO levels in Blue Heron Canal and the Main Lake have been a major water quality problem in past years. Since 2001 an aeration system has been operating in Blue Heron Canal. Prior to aeration, anoxia from decaying organic matter would cause fish mortality and odor prob-lems. Aeration during 2003 kept DO levels above 6 mg/L year around and there were no reports of major fish mortality in the canal.

A layered aeration system was installed in the Main Lake during the summer of 2001 and activated in August that same year. The first full year of Main Lake aeration was in 2002. Prior to aeration the entire

Location SeasonChlorophyll-a

(µg/L)Total P(µg/L)

SRP(µg/L)

Total N(µg/L)

Secchi(m)

Turbidity(NTU)

Lakewood Bay Annual 12 49 5 471 1.9 3.4

Summer 15 57 4 512 1.3 4.5

Main Lake Annual 17 58 10 808 1.9 6.6

Summer 21 58 3 670 1.2 10.3

West Bay Annual 26 173 15 1693 0.8 11.5

Summer 33 244 97 1029 0.6 20.8

Oswego Canal Annual 7 142 80 3741 1.3 2.9

Summer 8 131 52 3045 1.3 3.2

Blue HeronCanal

Annual 45 236 46 1554 0.7 18.2

Summer 81 314 46 2085 0.4 36.7

Outlet Annual 10 46 10 808 2.4 4.8

Summer 11 44 3 709 1.5 6.9

Bold = highest average during the summer; Underline = lowest average during the summer Summer=June–September

Abbreviations: Total P = Total Phosphorus, SRP = Soluble Reactive Phosphorus, Total N = Total Nitrogen, Secchi = Secchi depth, Turb = Turbidity; ug/L = micrograms per liter, m = meters, NTU = nephelometric turbidity units, C = Celsius


hypolimnion would be anoxic. In 2002 only the bottom meter was anoxic.The summer of 2003 showed an additional increase in the volume of oxygenated water in the hypolimnion.

Chemical Treatments: No copper was used in Oswego Lake in 2003. Chemical treatments were limited to herbicide applications to control non-native aquatic weeds. In spring of 2003 Lakewood Bay, Half Moon Bay, Oswego Canal and Blue Heron Canal were treated with herbicide.

OOOOsssswwwweeeeggggoooo LLLLaaaakkkkeeee WWWWaaaatttteeeerrrrsssshhhheeeedddd MMMMaaaannnnaaaaggggeeeemmmmeeeennnnttttTo provide long-term water quality solutions and to be pro-active in preserving the quality of the Lake, watershed activities are a major part of the LOC management plan.

Tualatin River Flows: The 2003 flow policy called for daytime flows of approximately 3 cfs and night-time flow of 30 cfs. Nighttime flow occurred only when water was necessary to maintain lake level.

Lake-Friendly Fertilizer: LOC developed an inorganic non-phosphorus turf fertilizer in 2000 that has been very popular. The next step was to initiate a turf fertilizer ordinance with the City of Lake Oswego. Additional soil samples were collected around the City and City engineers researched the possibility of having restrictions on what people apply to their lawns. The goal is to improve water quality for all three water bodies, the Tualatin River, the Willamette River, and Oswego Lake. No additional work towards a City ordinance was performed in 2003.

Stream Restoration: The City of Lake Oswego installed a flow meter on Springbrook Creek in August of 2000 and added an autosampler in 2001. The City's largest stream restoration project was completed in 2001. The City spent $300,000 restoring 2,316 feet of Springbrook Creek. The goal of the project was to reintroduce the natural floodplain and to lengthen the stream with new meanders. Although the City had plans to restore a section of Springbrook Creek near its outfall into Oswego Lake, no progress was made on the project during 2003. A stream evaluation project performed by the LOC is scheduled to take place during 2004.

OOOOsssswwwweeeeggggoooo LLLLaaaakkkkeeee WWWWaaaatttteeeerrrr QQQQuuuuaaaalllliiiittttyyyy IIIImmmmpppprrrroooovvvveeeemmmmeeeennnntttt PPPPrrrroooojjjjeeeeccccttttIn 2001, LOC installed and operated a 2-layer aeration system for the Main Lake. During the summer of 2003 one compressor was turned on April 3 and the second compressor on June 10. The aeration system was turned off on October 16th. During this second full year of aeration the dissolved oxygen levels in the main lake hypolimnion were slightly higher than in 2002.

OOOOsssswwwweeeeggggoooo LLLLaaaakkkkeeee FFFFiiiisssshhhh SSSSccccrrrreeeeeeeennnn PPPPrrrroooojjjjeeeeccccttttDuring the summer of 2002 a mandatory fish screen was installed on the Oswego Canal intake structure. Along with preventing salmonids from becoming trapped in Oswego Lake, the fish screen was beneficial in keeping floating leaves and debris from passing through the headgate and into the lake.

MMMMaaaannnnaaaaggggeeeemmmmeeeennnntttt iiiinnnn tttthhhheeee FFFFuuuuttttuuuurrrreeeeLOC continues to monitor the Lake and watershed to better understand the ecosystem. Future plans are:

• Continue to implement the integrated aquatic plant management plan involving herbicides and har-vesting

• Continue educating watershed residents about water quality impacts• Assess conditions in bays and canals and propose localized solutions• Work with City to improve surface water runoff to the Lake• Import all water quality data into a database to improve management decisions• Maximize the water quality improvements with the 2-layer lake aeration system


OOOORRRREEEEGGGGOOOONNNN WWWWAAAATTTTEEEERRRR RRRREEEESSSSOOOOUUUURRRRCCCCEEEESSSS DDDDEEEEPPPPAAAARRRRTTTTMMMMEEEENNNNTTTTBY DARRELL C. HEDIN, WATERMASTER, DISTRICT 18IIIInnnnttttrrrroooodddduuuuccccttttiiiioooonnnnThe District 18 Watermaster's Office is a field office of the Oregon Water Resources Department (OWRD) in cooperation with Washington County, and is responsible for water supply management within the Tual-atin, Lake Oswego, and Lower Willamette Drainage Basins.

The Watermaster's Office is part of the Field Services Division of OWRD. There are twenty Watermaster Districts statewide, organized into five regions. The Watermaster functions as a local contact for landown-ers, elected officials, and watershed councils, as well as other governmental agencies at the local, state and federal level. Duties include conducting streamflow measurements and maintaining gaging stations, in addition to performing well inspections and collecting groundwater level data. Information is also pro-vided to landowners and others on water rights and Oregon Water Law. The Watermaster is also responsi-ble for regulating water use during times of shortage.

PPPPrrrriiiioooorrrr AAAApppppppprrrroooopppprrrriiiiaaaattttiiiioooonnnnOregon's water laws are based on the principle of prior appropriation. This means that the first person to obtain a water right on a stream is the last to be shut off in times of low streamflow. In water-short times, the water right holder with the oldest date of priority can demand the water speci-fied in his water right, regard-less of the needs of junior users. If there is a surplus beyond the needs of the senior right holder, the water right holder with the next oldest pri-ority date can divert the quan-tity allowed under his right, and so on down the line. The date of application for a permit to use water usually becomes the priority date of the right.

The prior-appropriation doctrine is the basis of water law for most of the states west of the Mississippi River. In Oregon, the appropriation doctrine has been law since February 24, 1909, when passage of the first unified water code introduced state control over the right to use water. Before then, water users had to depend on themselves to defend their right to water.


WWWWaaaatttteeeerrrr RRRRiiiigggghhhhtttt RRRReeeegggguuuullllaaaattttiiiioooonnnnThe regulation season within the Tualatin River Basin for 2003 is summarized below. The year proved to be hotter and drier than last year, which resulted in an increase in water right regulation.

WWWWaaaatttteeeerrrrmmmmaaaasssstttteeeerrrr,,,, DDDDiiiissssttttrrrriiiicccctttt 11118888 SSSSttttaaaaffffffffFrom left to right, Matt Welsh- Hydrological Technician, Darrell Hedin- Watermaster, Karen Frone- Senior Administrative Specialist, Bob Wood- Assistant Watermaster, and Cole Beaman- Hydrological Technician.

GGGGaaaaggggiiiinnnngggg SSSSttttaaaattttiiiioooonnnnssssA complete listing of streamflow gaging stations that are operated by OWRD within the Tualatin River Basin is given on the following page

2003 was the first full year of operation of the Tualatin River below Lee Falls Gaging Station. This site was established to provide flow information within the upper basin and is located at Tualatin River mile 70.7. Cooperators at this site include the landowner Ralph Raines, Clean Water Services, Joint Water Commission, and the Bureau of Reclamation. The station operates using the latest in electronic technol-ogy, including a Rittmeyer pressure transducer and a Stevens Water Monitoring recording system, linked by telemetry using the GOES Satellite network. Real-time stream flow information from this site and oth-ers within the Tualatin Basin are accessible at http://owrd.e-monitoring.net

2003 WATER RIGHTS REGULATIONDate On/Off Regulatory Activity Mile Back To

No regulatory activity at this time

6/3/2003 Off Tualatin River & tributaries above Dairy CreekCity of Hillsboro (P-46423)City of Beaverton (P-45455)City of Forest Grove (P-40615)

> 44.73 2/19/1963

7/24/2003 Off City of Hillsboro (Sain Cr, P-2443)City of Hillsboro (Sain Cr, P-1136)

n/a 1/22/1912

7/31/2003 Off Tualatin River and tributaries above Gales Creek > 56.8 1/1/1940

8/4/2003 Off McKay Creek and tributaries above Northrup Road > 15.5 2/26/1966

8/25/2003 Off Tualatin River and tributaries above Dairy Creek to RM 56.9 > 44.74, < 56.9 7/12/1950

8/25/2003 Off Tualatin River and tributaries above Gales CreekCity of Hillsboro (4 cfs shutoff under P-10408)

> 56.8 8/15/1930

9/2/2003 Off EF Dairy Creek above RM 13 > 13.0 5/26/1966

9/10/2003 On City of Hillsboro (4 cfs under P-10408) 77.3 n/a

10/6/2003 On City of Hillsboro (5 cfs under P-10408) 77.3 n/a

10/22/2003 On City of Hillsboro (P-46423)City of Beaverton (P-45455)City of Forest Grove (P-40615)

> 44.73 2/6/1974

11/17/2003 On All back on > 0.00 all


WATERMASTER DISTRICT 18 GAUGING STATIONS FOR 2003Station Number

Stream Stream Mile Latitude Longitude Type

14206933 Ash Creek @ Metzger Park @ Metzger, OR 1.25 45°27’00”N 122°45’45”W Logger

14206435 Beaverton Creek @ 216th Ave near Orenco, OR. 1.2 45°31’15”N 122°53’59”W Logger

14206400 Beaverton Creek @ 170th near Aloha, OR 5.0 45°30’03”N 122°51’03”W Staff

14206360 Beaverton Creek @ Cedar Hills Blvd @ Beaverton, OR 7.45 45°49’31”N 122°81’05”W Logger

14206423 Bronson Creek @ Bronson Rd near Orenco, OR 2.1 45°32’18”N 122°51’15”W Logger

14206421 Bronson Creek @ West Union near Orenco, OR 3.1 45°32’42”N 122°50’18”W Staff

14206419 Bronson Creek @ Saltzman Rd near Orenco, OR 5.1 45°33’19”N 122°48’25”W Logger

14206748 Cedar Creek @ Edy Rd near Sherwood, OR 0.62 45°22’05”N 122°51’22”W Logger

14206395 Cedar Mill Creek @ Murray Blvd near Beaverton, OR 1.64 45°30’37”N 122°49’18”W Logger

14206750 Chicken Creek @ Scholls-Sherwood Rd near Sherwood, OR 2.3 45°22’31”N 122°51’24”W Logger

14206200 Dairy Creek at Hwy 8 near Hillsboro, OR 2.06 45°30’38”N 123°06’56”W *Logger

14205480 E. Fk. Dairy Creek at Dairy Creek Rd near Mountaindale, OR 12.33 45°40’32”N 123°03’54”W Staff

14205000 W. Fk. Dairy Creek @ Banks, OR 7.7 45°37’26”N 123°06’59”W Staff

14205160 W. Fk. Dairy Creek @ Evers Rd near Roy, OR 1.96 45°34’34”N 123°05’34”W Staff

14206443 Dawson Creek @ Brookwood Rd near Hillsboro, OR 0.7 45°31’27”N 122°56’01”W Logger

14206441 Dawson Creek @ Airport Rd near Hillboro, OR 2.2 45°32’18”N 122°56’05”W Staff

14206365 Erickson Creek @ Menlo Dr @ Beaverton, OR 0.76 45°29’14”N 122°58’54”W Logger

14206950 Fanno Creek @ Durham Rd near Tigard, OR 1.2 45°24’12”N 122°45’18”W *Logger

14206928 Fanno Creek nr SW Parkview Loop near Metzger, OR 7.3 45°27’27”N 122°47’43”W Staff

14206925 Fanno Creek @ Scholls Ferry Rd near Garden Home, OR 9.4 45°28’16”N 122°46’25”W Staff

14204530 Gales Creek @ Old Hwy 47 @ Forest Grove, OR 2.36 45°30’39”N 123°06’56”W *Logger

14204540 Gales Creek @ Clapshaw Hill Rd near Gales Creek, OR 12.36 45°35’39”N 123°12’38”W Staff

14206957 Hedges Creek Wetland near Tualatin, OR 1.2 45°22’53”N 122°46’35”W Logger

14206958 Hedges Creek @ Tualatin Park @ Tualatin, OR 0.3 45°23’08”N 122°45’37”W Logger

14206372 Johnson Creek @ Davis Rd near Beaverton, OR 1.3 45°28’30”N 122°49’52”W Logger

14206070 McKay Creek above Waible Cr @ Scotch Church Rd near North Plains, OR 6.3 45°57’21”N 122°99’18”W Logger

14206180 McKay Creek @ near Hillsboro, OR (Hornecker Rd.) 2.2 45°32’33”N 123°00’14”W Staff

14205980 McKay Creek @ Northrup Rd near North Plains, OR 15.5 45°38’36”N 122°59’32”W Staff

14205960 E. Fk. McKay Creek above Neil Cr @ Dixie Mtn. Rd near North Plains, OR 0.5 45°39’15”N 122°58’33”W Staff

14207000 Oswego Canal near Lake Oswego, OR 6.7 45°23’18”N 122°43’10”W Logger

14206450 Rock Creek @ Hwy 8 near Hillsboro, OR 1.2 45°30’08”N 122°56’52”W Logger

14206347 Rock Creek @ Quatama Rd @ Orenco, OR 4.9 45°31’25”N 122°54’34”W Logger

14206305 Rock Creek @ Rock Creek Rd near Bowers Junction, OR 15.8 45°37’04”N 122°53’13”W Logger

14206338 Rock Creek near Bethany, OR (West Union Rd) 9.0 45°33’34”N 122°52’30”W Logger

14202920 Sain Creek above Hagg Lake near Gaston, OR 1.6 45°28’50”N 123°14’40”W Logger

14202850 Scoggins Creek above Hagg Lake near Gaston, OR 8.0 45°30’06”N 123°15’06”W *Logger

14211116 Springbrook Creek @ Iron Mtn Rd near Lake Oswego, OR 0.18 45°24’46”N 122°42’13”W Logger

SLAB Summer Creek above Summer Lake near Tigard, OR 1.52 45°26’20”N 122°48’38”W Logger

14206938 Summer Creek @ 121st Ave near Tigard, OR 1.0 45°26’06”N 122°47’55”W Logger

14206905 Sylvan Creek @ Raleighwood Ln near West Slope, OR 1.0 45°29’35”N 122°44’48”W Logger

14202860 Tanner Creek above Hagg Lake near Gaston, OR 1.6 45°30’21”N 123°13’10”W Staff

14202450 Tualatin River below Lee Falls near Cherry Grove, OR 70.7 45°30’21”N 123°13’06”W Logger

14202510 Tualatin River @ Gaston, OR 62.3 45°26’21”N 123°07’85”W *Logger


14204800 Tualatin River @ Golf Course Rd near Cornelius, OR 51.5 45°30’08”N 123°03’22”W *Logger

14206241 Tualatin River @ Hwy 219 near Hillsboro, OR 44.4 45°30’01”N 122°59’24”W Staff

14206295 Tualatin River @ Rood Bridge 38.4 45°29’24”N 122°57’06”W *Logger

14206500 Tualatin River @ Farmington 33.3 45°26’58”N 122°57’02”W *Logger

14206600 Tualatin River @ Elsner 16.2 45°23’17”N 122°51’03”W Staff

14206960 Tualatin River @ Tualatin 8.9 45°23’14”N 122°45’46”W Logger

14206990 Tualatin River @ Oswego Canal near Lake Oswego, OR 6.7 45°22’57”N 122°43’17”W Logger

14206100 Waible Creek at Jackson School Rd near Hillsboro, OR 1.0 45°33’55”N 122°58’12”W Logger

WAPO Wapato Canal near Gaston, OR (from Tualatin R) 61.9 Staff

14206410 Willow Creek @ NW 143rd Ave near Beaverton, OR 3.5 45°32’12”N 122°49’24”W Logger

14206413 Willow Creek @ Heritage Pkwy near Beaverton, OR 0.75 45°31’12”N 122°51’35”W Logger

*Telemetry

WATERMASTER DISTRICT 18 GAUGING STATIONS FOR 2003Station Number

Stream Stream Mile Latitude Longitude Type

Gauging station at Tualatin River below Lee Falls near Cherry Grove, OR


SSSSttttrrrreeeeaaaammmmfffflllloooowwww MMMMeeeeaaaassssuuuurrrreeeemmmmeeeennnnttttssssWatermaster staff conducted over 500 streamflow measurements in 2003 to verify discharge in relation to water level elevation. Thirty-eight gages compile continuous elevation read-ings, or stage, recorded at 15-minute intervals. The discharge measurement made at a site corresponds to the stage of the water at that time. These points are then plotted on a graph. The mea-surement points are used to create a “curve of best fit” which is then used to generate a rating table for a particu-lar site. Each increment of stage has a corresponding discharge value associ-ated with it. This rating will become more refined over time as more dis-charge measurements are made. In addition, stream and river channels are constantly changing over time. As they change, the rating may be adjusted to reflect that change.

.


To accomplish the goal of obtaining frequent high quality streamflow measurements, the District 18 Watermaster's office recently purchased an Acoustic Doppler Current Profiler, or ADCP. In operation by the United States Geological Survey for several years, this system uses the “Doppler Effect” to transmit sound energy at a fixed frequency and listens to echoes returning from sound scatterers in the water. Course and position are recorded using an internal compass as the transducer tracks the bottom, while it is manually towed across the waterway to obtain a total flow. This system has made it possible for staff to obtain highly accurate measurements of streamflow in a fraction of the time that it takes using conven-tional methods.

For many years, the methods for directly measuring stream discharge changed very little. Methods using mechanical devices, which are still used today, range from hanging the sensor from a bridge to setting up cross-river cableways. The ADCP represents a revolutionary advancement in velocity and discharge mea-surement and is now capable of measuring low channel velocities in very shallow water.


TTTTUUUUAAAALLLLAAAATTTTIIIINNNN VVVVAAAALLLLLLLLEEEEYYYY IIIIRRRRRRRRIIIIGGGGAAAATTTTIIIIOOOONNNN DDDDIIIISSSSTTTTRRRRIIIICCCCTTTTBY WALLY OTTO, RESERVOIR SUPERINTENDENT

IIIInnnnttttrrrroooodddduuuuccccttttiiiioooonnnnThe Tualatin Valley Irrigation District (TVID) was formed in 1962 and is located in Forest Grove Oregon. According to County records, in 1915, about 15 acres were irrigated in the Washington County. By 1933, that total had grown to 130 acres. In 1951, there was a total of 18,455 acres with water rights in the County. When the District was formed in 1962, the total had increased to 33,885 acres. TVID was formed to assist in delivery of irrigation water to about half of those acres (17,000) in the Tualatin Basin. The water is supplied from natural flow, return flow and since 1975, from water stored in the Winter behind Scoggins dam. Most of the water from these three sources is pumped from the Tualatin River at the Spring Hill Pump Plant. It is then delivered to patrons through approximately 120 miles of pressurized pipeline. Additional water flows down the river and is withdrawn by irrigators at their individual pump sites. When natural flow no longer meets demand, water is discharged from Scoggins Dam storage to augment the river flow and supply the irrigation needs of the District patrons. Water for some of the District members on the lower Tualatin River is supplied by reuse water discharged from the two Clean Water Services treatment plants. Crops irrigated with District water range from row crops including blueberries, black-caps, corn, pumpkins and other vegetables to nursery stock.

2222000000003333 TTTTVVVVIIIIDDDD OOOOvvvveeeerrrrvvvviiiieeeewwwwThe water year can be best characterized as normal. The first month (October 2002) of the year began drier than normal with only 0.73" (21% of normal) precipitation recorded. The result was that District patrons continued to use storage water. By Nov. 15th however, 3.71" of precipitation had arrived and stor-age use became very minimal for the remainder of the month. Winter rains produced adequate inflow for Scoggins Reservoir to hit the fill curve just before January 15, 2003 and it was at 100% capacity (53,640 Acre feet) on May 1, 2003-meeting the fill schedule. The Tualatin river natural flows remained adequate for District water needs until early June 2003. Tualatin River water regulation began on June 2nd when both the TVID and the Joint Water Commission (JWC) began using stored water to meet their demands. TVID continued its use of stored water until November 23rd

2222000000003333 TTTTVVVVIIIIDDDD OOOOppppeeeerrrraaaattttiiiioooonnnn aaaannnndddd MMMMaaaaiiiinnnntttteeeennnnaaaannnncccceeee Construction of the two “Round About” projects on Martin and Cornelius Schefflin roads was completed in the Fall of 2003. As a result of careful planning, communication, and supervision, the entire project was completed without injury or significant interruption of TVID service in the area. The District, in coopera-tion with the Joint Water Commission and the Bureau of Reclamation, also performed extensive fore bay maintenance at the Springhill Pump Plant in late October, 2003. An estimated 6,000 yards of channel silt and aquatic weeds that were choking the channel were removed and placed in a holding pond nearby. The finished fore bay is now four to six feet deep for summer time operations. Another major project occurred at the Spring Hill Pump Plant and began in November 2003. This involved relocating the new 72" Joint Water Commission transmission line from the Fernhill Treatment Plant to Forest Grove. It had been installed over the 60" TVID discharge line from the Pump Plant. The 72" line had to be relocated to below the TVID line as originally approved. This significant relocation project was funded by the Joint Water Commission and was finished by March 1, 2004.

The Oregon Water Resources Dept. reviewed the TVID “Final Proof.” Additional primary supplemental affidavits are still required before a determination is made by the Department. On a different note, TVID water assessments were increased for pipeline, river and interruptible water users for next season.

2222000000003333 TTTTVVVVIIIIDDDD WWWWaaaatttteeeerrrr UUUUsssseeeeSmall amounts of water were delivered beginning in May and continued until late November. The heavy usage was during the months of June through September. The water at the beginning and end of the season was used primarily for frost control and by the container nursery industry. The District used 19,633 acre feet of storage water during the season. This compared to 19,093 acre feet used in 2002 and to 10,702 acre feet used during the drought year of 2001. The average annual TVID use for the past ten years from stor-


age has been 16,613 AF including the low use year of 2001. The District had 6,414 acre feet remaining in storage on Nov. 17th when all deliveries were shut down for the season.

SSSSccccooooggggggggiiiinnnnssss DDDDaaaammmmScoggins Dam, the primary feature of the Tualatin Project, is located on Scoggins Creek, a tributary of the Tualatin River. Owned by Reclamation, Scoggins Dam was built in the early 1970's for the purpose of storing water in the winter to augment low summertime flows in the Tualatin River. Operation and Main-tenance of the dam is conducted under contract between the TVID and Reclamation. Scoggins Dam pro-vides flood control for the cities of Gaston, Forest Grove, Cornelius and other downstream communities. Irrigation water is supplied to 17,000 acres in the Tualatin basin from the Project. The Lake Oswego Cor-poration receives 500 additional acre feet for irrigation. Municipal and Industrial water users include the Cities of Forest Grove, Hillsboro and Beaverton who have claims to 13,500 acre feet. Clean Water Ser-vices has 16,900 acre feet contracted from the Project which includes 12,618 acre feet from storage. This water is used to augment the low Summer Tualatin River stream flows to help meet water quality stan-dards set for the River. The reservoir (Henry Hagg Lake) is also a major recreational destination. In 2003, there were 677,755 user days recorded at the 2,851 acre site. The Park and Lake opened on the first week-end of March and closed the third weekend of November. Recreational uses included boating, fishing, pic-nicking, swimming, hiking, biking and relaxation.

A Reclamation “Safety of Dams” project was completed in November of 2003. Extensive investigation by Reclamation resulted in the modification of the spillway gate arms. This was done to meet new earthquake loading standards. The arms were strengthened by welding additional flatbar to the sides and tops of the arms. When finished, all arms were again painted with protective coating for corrosion protection.

Security at Scoggins dam remains a priority. The Department of Homeland Security (DHS) initiated a five level alert system. Reclamation's Advisory System and Response Measures correspond to the levels and were enforced on the Project as follows:

The alert level was at Yellow during most of the year but was elevated to Orange four separate times. The Project is inspected thoroughly seven days a week when at this heightened level. None of the alert level elevations were due to specific threats to Scoggins Dam. According to Reclamation guidelines, Scoggins Dam is required to follow the national security threat level criteria as set forth by the DHS.

Numerous tours were given to grade school classes from the West Metro area. These tours followed the release of fish “frye” which each classroom had hatched and raised to fry stage. The tours were sometimes limited to “off-dam” sites due to the alert level being at Orange. The purpose of these tours is to familiar-ize students, teachers and adults with the purposes of Scoggins Dam and its benefit to the Basin and com-munity. For the same reason, several Power Point presentations were given to community organizations.

“Catch A Special Thrill” (CAST) continued to be a special thrill on Sept 7th. Twenty seven children ages 7-16 years old participated. These kids have a variety of physical or developmental disabilities and in some cases, a terminal illness. Each child was given fishing gear, fun packs and a variety of goodies donated by the local community. There were 17 boats with drivers and 60 volunteers. Many fish were caught by excited youngsters. It is unknown how many hamburgers & hotdogs were cooked by the Kiwa-nis Clubs but everyone who attended had plenty to eat. While it is thrilling to catch fish, nothing brings on a bigger smile than “going fast!” Partners in this event include: Reclamation, CAST for Kid Foundation, Oregon State BASS anglers, Oregon Department of Fish and Wildlife, Washington County Parks, the Tualatin Valley Irrigation District and the event was hosted by the local Kiwanis Clubs.

Green alert Low risk of terrorist attacks

Blue alert General risk of terrorist attacks

Yellow alert Significant risk of terrorist attacks

Orange alert High risk of terrorist attacks

Red alert Severe risk of terrorist attacks


Flood Control: The Project operated under flood control restrictions several times during the year. Dur-ing these high inflow periods, minimum discharges were made. This allowed the reservoir to capture all runoff from the 39 square mile watershed. The excess water collected above the fill curve was later dis-charged safely into Scoggins Creek. A total of 49.90" of precipitation or 93.3% of normal was collected at the dam for the Water Year 2003 (October 2002 to September 2003). The flood control benefit attributed to Scoggins Dam is $25,148,000 from 1974 to 2002, the last available date. This is the amount of damage that would have occurred to streams, structures, lands, roads, fields and other infrastructure and conve-niences if the Dam had not been in place.

SUMMARY OF HISTORICAL WATER DELIVERIES FROM SCOGGINS DAM—ALL VALUES IN ACRE-FTThe following totals reflect water delivered from storage and is in addition to all water used by the contracting agencies from natural and return flow. One-acre foot equals 325,390 gallons. Reservoir full pool is 53,640-acre-ft.

Agency 2003 2002 2001 2000 1999 1998 1997

TVID 19,633 19,093 10,704 15,012 18,248 14,758 16,463

CWS 11,606 12,618 2,403 15,276 11,971 9,407 6,716

Hillsboro 3,996 3,712 3,490 2,867 4,543 4,522 2,286

Forest Grove 2,013 3,664 2,243 572 910 818 253

Beaverton 3,998 1,508 3,053 2,236 2,912 3,719 1,807

Lake Oswego 501 496 383 500 500 499 500

Other 978 898 * 825 1,309 878 687

Total 42,725 41,989 22,276 37,688 41,530 34,599 28,712

(*Provisions were made to supply other M & I needs)


WWWWAAAATTTTEEEERRRR QQQQUUUUAAAALLLLIIIITTTTYYYY SSSSTTTTAAAATTTTUUUUSSSS RRRREEEEPPPPOOOORRRRTTTTBY JAN MILLER, CLEAN WATER SERVICES

TTTTuuuuaaaallllaaaattttiiiinnnn BBBBaaaassssiiiinnnn TTTTMMMMDDDDLLLLssssThe new Tualatin Total Maximum Daily Load (TMDL) became effective in August 2001. The Depart-ment of Environmental Quality revised the 1988 total phosphorus (for excessive algae and pH concerns) and ammonia (for low dissolved oxygen in the mainstem river) TMDLs and added TMDLs for tempera-ture, bacteria, and total suspended solids (for low dissolved oxygen in the tributaries). Although the TMDLs were approved prior to 2003, the Watershed NPDES permit was not issued until February 2004. This review shows data for TMDL parameters for treatment plant effluents and for river conditions for 2003. In some cases, comparisons to previous years are included to demonstrate trends. This evaluation is for general information and not to determine compliance. The statistics and reporting periods shown in this review may not match those used to judge compliance with the permits or to compare the river condi-tions to the TMDLs.

Total PhosphorusThe 2001 Tualatin TMDL set river and tributary loading capacities in mg/L. The following table shows the loading capacities and the data for the key sites both historically (1990 and 1995) and in recent years (2000 to 2003).

MEDIAN TOTAL PHOSPHORUS CONCENTRATIONS FOR SUMMER SEASON (MAY 1–OCT 31)

Location Code

LocationRiver Mile

2001 TMDL Loading Capacity(mg/L as P)

1990 TP(mg/L as P)

1995 TP(mg/L as P)

2000 TP(mg/L as P)

2001 TP(mg/L as P)

2002 TP(mg/L as P)

2003 TP(mg/L as P)

Tualatin River

3701715 Cherry Grove 71.5 0.04 — 0.01 0.01 0.03 0.01 0.02

3701612 Springhill 61.2 0.04 0.04 0.03 0.03 0.04 0.01 0.02

3701528 Golf Course Road 52.8 0.04 0.05 0.04 0.03 0.04 0.03 0.03

3701450 Hwy 219 44.4 0.04 — 0.07 0.05 0.07 0.05 0.06

3701391 Rood Bridge Road 39.1 0.09 0.10 0.08 0.06 0.08 0.05 —

3701333 Farmington Road 33.3 0.10 0.43 0.08 0.09 0.10 0.07 0.07

3701271 Scholls 27.1 0.10 0.15 0.09 0.08 0.10 0.08 0.08

3701165 Elsner 16.5 0.11 0.14 0.09 0.08 0.09 0.07 0.08

3701087 Boones Ferry Road 8.7 0.11 0.23 0.09 0.08 0.09 0.08 0.09

3701054 Stafford Road 5.4 0.10 0.23 0.09 0.08 0.09 0.08 0.08

3701002 Weiss Bridge 0.2 0.10 0.22 0.09 0.08 0.09 0.07 0.08

Tributaries

3805017 Scoggins @ Hwy 47 0.04 — 0.03 0.01 0.04 0.01 0.03

3810015 Gales @ New Hwy 47 0.04 0.06 0.05 0.04 0.05 0.04 0.05

3815021 Dairy @ Hwy 8 0.09 0.13 0.11 0.11 0.13 0.12 0.12

3820022 Rock @ Brookwood 0.19 0.21 0.21 0.18 0.20 0.20 0.22

3824001 Bronson @ 205th 0.13 0.13 0.12 0.12 0.15 0.10 0.15

3835020 Chicken @ SCH-SHER 0.14 0.23 0.12 0.11 0.13 0.12 0.11

3838001 Nyberg @ Brown 0.14 — — 0.17 — — 0.14

3840012 Fanno @ Durham 0.13 0.15 0.15 0.15 0.15 0.14 0.15


Clean Water Services received its Watershed NPDES permit on February 26, 2004. The following table shows the treatment plant performance relative to total phosphorus. The limits shown in this table were not the permit limits in 2003, but they would have been if the new permit had been in effect.

The phosphorus TMDL was developed to protect the beneficial use of (1) aesthetics, as measured by chlo-rophyll-a; and (2) fish and wild life, as measured by pH.

Three-month stratified mean chlorophyll-a for selected sites in the Tualatin Basin is shown in the follow-ing table. The water quality guidance level is 15 µg/L.

High pH values can result from photosynthetic activities of the algae. This causes a negative impact on aquatic resources. The data from the continuous recorder at the Lake Oswego dam at river mile 3.4 were evaluated. This is the area of the river with the maximum algal production. There were three hours on July 5, 2003 when the pH exceeded 8.5. Low pH values are not a problem on the Tualatin River system.

2003 MONTHLY MEDIAN TOTAL PHOSPHORUS CONCENTRATIONS IN WWTP EFFLUENT

May(mg/L as P)

June(mg/L as P)

July(mg/L as P)

Aug(mg/L as P)

Sept(mg/L as P)

Oct(mg/L as P)

Rock Creek WWTP Effluent 0.07 0.05 0.04 0.06 0.03 0.06

Limit 0.10 0.10 0.10 0.10 0.10 0.10

Durham WWTP Effluent 0.04 0.03 0.07 0.06 0.02 0.06

Limit 0.11 0.11 0.11 0.11 0.11 0.11

2003 THREE-MONTH MEAN CHLOROPHYLL-a CONCENTRATIONS

LocationRiver Mile

Mar–May(µg/L as P)

Apr–Jun(µg/L as P)

May–Jul(µg/L as P)

Jun–Aug(µg/L as P)

Jul–Sep(µg/L as P)

Aug–Oct(µg/L as P)

Tualatin River

Rood Bridge Road 39.1 no sampling 2003; bridge under construction

Farmington Road 33.3 2.81 3.06 2.53 1.95 1.51 1.32

Scholls 27.1 2.82 3.02 3.46 3.36 2.94 1.75

Elsner 16.5 3.67 8.50 17.90 17.42 12.93 2.91

Boones Ferry Road 8.7 4.05 11.77 12.17 11.85 5.23 4.28

Stafford Road 5.4 4.11 16.81 21.47 22.41 11.92 6.73

Tributaries

Dairy @ Hwy 8 3.94 3.46 2.97 3.25 3.57 5.81

Chicken @ SCH-SHER 1.35 1.61 2.23 2.14 2.35 1.71

Fanno @ Durham 2.33 2.32 1.80 1.58 2.01 2.45


AAAAmmmmmmmmoooonnnniiiiaaaa TTTTMMMMDDDDLLLLThe 2001 TMDL revised the ammonia TMDL. It allows higher loads of ammonia in the spring and early summer when river conditions are favorable for the assimilation of ammonia and lower ammonia loads in the fall when sediment oxygen demand consumes more oxygen. The Watershed NPDES permit outlines the ammonia discharge limits that are a function of the previous weeks Farmington flow and the down-stream dissolved oxygen levels.

The following table compares the effluent ammonia load with the most restrictive ammonia limit. A less restrictive limit would be in place if dissolved oxygen levels were higher downstream of the treatment plants. The actual permit is based on weekly ammonia discharges.

The ammonia TMDL is designed to protect the dissolved oxygen levels in the reservoir-like section of the Tualatin River. The water quality criteria for this section of the river, which is considered “Cool Water Habitat”, are.

• Grab samples: DO > 6.5 mg/L • Continuous Monitoring:–

– 30-day average of daily mean DO > 6.5 mg/L (no credit for supersaturation)– 7-day average of daily minimum DO > 5.0 mg/L– Daily minimum DO > 4.0 mg/L

The following table shows the river conditions relative to dissolved oxygen.

2003 MONTHLY AMMONIA CONCENTRATIONS, LOADS AND LIMITS FOR WWTP EFFLUENT

May June July August Sept October Nov 1–17

River conditions and limits

Farmington median flow (cfs) 505 185 127 146 147 195 161

Allowed river concentration (mg/L as N). 1.4 1.4 0.8 0.3 0.21 0.21 0.21

Rock Creek WWTP conditions and limits

Monthly mean effluent flow (MGD) 32.2 28.4 28.3 28.4 25.6 26.9 26.2

Monthly mean effluent flow (cfs) 49.8 44 43.8 44 39.6 41.6 40.6

Monthly median load (lb/day) 8.7 7.4 5.2 5.4 3.5 7.3 4

Effluent limit (lb/day) 3811 1396 548 236 166 221 182

Durham WWTP conditions and limits

Monthly mean effluent flow (MGD) 20.3 16.1 15.2 15.4 14.9 16.3 17.6

Monthly mean effluent flow (cfs) 31.4 24.9 23.5 23.8 23.1 25.2 27.2

Monthly median load (lb/day) 8.8 6 4.8 4.2 7.3 5 8

Effluent limit (lb/day) 3811 1396 548 236 166 221 182

NUMBER OF DAYS THAT DID NOT MEET DISSOLVED OXYGEN CRITERIA

Criterion May June July Aug Sept Oct Nov1-17Summer

Percentage

Tualatin River at RM 24.5

30 day 0 0 0 0 0 0 0 0 %

7 day 0 0 0 0 0 0 0 0 %

Daily 0 0 0 0 0 0 0 0 %

Tualatin River at Oswego Dam

30 day 0 0 0 13 2 5 7 13.4 %

7 day 0 0 0 0 0 0 0 0 %

Daily 0 0 0 1 0 0 0 0.5 %


The days when the 30-day mean dissolved oxygen levels at the Oswego Dam were below 6.5 mg/L corre-spond to days with low algal growth and, consequently, low dissolved oxygen production. The day with a dissolved oxygen level below 4.0 mg/L corresponds to a period of time when the river turned over. During this time the weather conditions cooled down so the upper layers of water mixed with the lower layers of water resulting in a low dissolved oxygen level for one day.

The new TMDLs are for temperature, bacteria on both the mainstem of the Tualatin River and the tributar-ies and for tributary total suspended solids for dissolved oxygen. The best way to display the data concern-ing these parameters is being developed. Graphs of dissolved oxygen levels measured by continuous monitors are shown for the summer period. These data are available at http://oregon.usgs.gov/cgi-bin/grapher/graph_setup.pl?basin_id=tualatin.

0

10

20

30

40

50

60

70

80

90

100

110

120

130

140

150

Oxy

gen

% S

atu

rati

on

(%

sat

.)

5-0

1-20

03

5-1

5-20

03

5-2

9-20

03

6-1

2-20

03

6-2

6-20

03

7-1

0-20

03

7-2

4-20

03

8-0

7-20

03

8-2

1-20

03

9-0

4-20

03

9-1

8-20

03

10-0

2-20

03

10-1

6-20

03

10-3

0-20

03

11-1

3-20

030

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

Dis

solv

ed O

xyg

en (

mg

/L)

Scoggins Creek below Henry Hagg Lake near Gaston, OR (14202980)Data from U.S. Geological Survey

Data gaps are due to sensor malfunction or data that did not meet quality criteria.


0

10

20

30

40

50

60

70

80

90

100

110

120

130

140

150

Oxy

gen

% S

atu

rati

on

(%

sat

.)

5-0

1-20

03

5-1

5-20

03

5-2

9-20

03

6-1

2-20

03

6-2

6-20

03

7-1

0-20

03

7-2

4-20

03

8-0

7-20

03

8-2

1-20

03

9-0

4-20

03

9-1

8-20

03

10-0

2-20

03

10-1

6-20

03

10-3

0-20

03

11-1

3-20

03

0

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

Dis

solv

ed O

xyg

en (

mg

/L)

Gales Creek at Old Hwy 47, Forest Grove, OR (453040123065201)Data from U.S. Geological Survey


0

10

20

30

40

50

60

70

80

90

100

110

120

130

140

150

Oxy

gen

% S

atu

rati

on

(%

sat

.)

5-0

1-20

03

5-1

5-20

03

5-2

9-20

03

6-1

2-20

03

6-2

6-20

03

7-1

0-20

03

7-2

4-20

03

8-0

7-20

03

8-2

1-20

03

9-0

4-20

03

9-1

8-20

03

10-0

2-20

03

10-1

6-20

03

10-3

0-20

03

11-1

3-20

03

0

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

Dis

solv

ed O

xyg

en (

mg

/L)

Dairy Creek at Hwy 8, Hillsboro, OR (453113123003501)Data from U.S. Geological Survey



0

10

20

30

40

50

60

70

80

90

100

110

120

130

140

150

Oxy

gen

% S

atu

rati

on

(%

sat

.)

5-0

1-20

03

5-1

5-20

03

5-2

9-20

03

6-1

2-20

03

6-2

6-20

03

7-1

0-20

03

7-2

4-20

03

8-0

7-20

03

8-2

1-20

03

9-0

4-20

03

9-1

8-20

03

10-0

2-20

03

10-1

6-20

03

10-3

0-20

03

11-1

3-20

03

0

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

Dis

solv

ed O

xyg

en (

mg

/L)

Rock Creek at Woll Pond Way, Hillsboro, OR (453104122551201)Data from U.S. Geological Survey


0

10

20

30

40

50

60

70

80

90

100

110

120

130

140

150

Oxy

gen

% S

atu

rati

on

(%

sat

.)

5-0

1-20

03

5-1

5-20

03

5-2

9-20

03

6-1

2-20

03

6-2

6-20

03

7-1

0-20

03

7-2

4-20

03

8-0

7-20

03

8-2

1-20

03

9-0

4-20

03

9-1

8-20

03

10-0

2-20

03

10-1

6-20

03

10-3

0-20

03

11-1

3-20

03

0

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

Dis

solv

ed O

xyg

en (

mg

/L)

Beaverton Creek at 170th Ave, Beaverton, OR (453004122510301)Data from U.S. Geological Survey



0

10

20

30

40

50

60

70

80

90

100

110

120

130

140

150

Oxy

gen

% S

atu

rati

on

(%

sat

.)

5-0

1-20

03

5-1

5-20

03

5-2

9-20

03

6-1

2-20

03

6-2

6-20

03

7-1

0-20

03

7-2

4-20

03

8-0

7-20

03

8-2

1-20

03

9-0

4-20

03

9-1

8-20

03

10-0

2-20

03

10-1

6-20

03

10-3

0-20

03

11-1

3-20

03

0

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

Dis

solv

ed O

xyg

en (

mg

/L)

Chicken Creek at Scholls-Sherwood Hwy, Sherwood, OR (452230122512201)Data from U.S. Geological Survey


0

10

20

30

40

50

60

70

80

90

100

110

120

130

140

150

Oxy

gen

% S

atu

rati

on

(%

sat

.)

5-0

1-20

03

5-1

5-20

03

5-2

9-20

03

6-1

2-20

03

6-2

6-20

03

7-1

0-20

03

7-2

4-20

03

8-0

7-20

03

8-2

1-20

03

9-0

4-20

03

9-1

8-20

03

10-0

2-20

03

10-1

6-20

03

10-3

0-20

03

11-1

3-20

03

0

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

Dis

solv

ed O

xyg

en (

mg

/L)

Fanno Creek at Durham Road (14206950)Data from U.S. Geological Survey



0

10

20

30

40

50

60

70

80

90

100

110

120

130

140

150

Oxy

gen

% S

atu

rati

on

(%

sat

.)

5-0

1-20

03

5-1

5-20

03

5-2

9-20

03

6-1

2-20

03

6-2

6-20

03

7-1

0-20

03

7-2

4-20

03

8-0

7-20

03

8-2

1-20

03

9-0

4-20

03

9-1

8-20

03

10-0

2-20

03

10-1

6-20

03

10-3

0-20

03

11-1

3-20

03

0

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

Dis

solv

ed O

xyg

en (

mg

/L)

Tualatin River at River Mile 24.5 (14206694)Data from U.S. Geological Survey


0

10

20

30

40

50

60

70

80

90

100

110

120

130

140

150

Oxy

gen

% S

atu

rati

on

(%

sat

.)

5-0

1-20

03

5-1

5-20

03

5-2

9-20

03

6-1

2-20

03

6-2

6-20

03

7-1

0-20

03

7-2

4-20

03

8-0

7-20

03

8-2

1-20

03

9-0

4-20

03

9-1

8-20

03

10-0

2-20

03

10-1

6-20

03

10-3

0-20

03

11-1

3-20

03

0

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

Dis

solv

ed O

xyg

en (

mg

/L)

Tualatin River at Oswego Diversion Dam (14207200)Data from U.S. Geological Survey


AAAAppppppppeeeennnnddddiiiixxxx AAAA

HHHHyyyyddddrrrrooooggggrrrraaaapppphhhhssss ffffoooorrrr FFFFlllloooowwww MMMMoooonnnniiiittttoooorrrriiiinnnngggg SSSSiiiitttteeeessssaaaannnndddd RRRReeeesssseeeerrrrvvvvooooiiiirrrr RRRReeeelllleeeeaaaasssseeeessss

The following information is used at monthly meetings to evaluate flows in the Tualatin Basin. These are provisional data and have not been reviewed or edited. Some of the data represent daily mean flows and some represent instantaneous measurements.

The data in Appendix E have been reviewed and edited for quality.

APPENDIX A—Hydrographs for Flow Monitoring SitesA-2 2003 Tualatin River Flow Management Report

FLOW MONITORING SITES — LOCATIONS

North

SSSSCCCCHHHHEEEEMMMMAAAATTTTIIIICCCC MMMMAAAAPPPPNot to Scale

Fanno Creek

Cr

Cr

Cr

S. Rock

McF

ee C

r

Christensen

Creek

Creek

Rock

Gales

SCHO

TANOSCOO

DLLO

TRTRTRNF

CGIC

TRLF

PVR1 & PVR2

WAPO

PVPP

Scog

Barney Reservoir

Scoggins Reservoir

SHPP

DAIRY

TRJB

ROODRCTV

TRGC

USARC

FRMO

USADH

FANO

LOCL

Lake Oswego

SDMO

WI L L A M

E T T E RI V

ER

TU

AL

R

Sampling and Flow Sites

Withdrawal Points

Wastewater Treatment Plants

Precipitation Monitoring Station

JWCS

WSLO

TBRC

HFOP

SCOP

JWOP

FGOP

Dairy

Creek

Burris Cr

He Cr

Baker CrChicken

Cedar Cr

Canal

(Hagg Lake)SCO

GASO & GSTP

Ash C

r

Hedges C

r

Sain Cr

Ta

gins

Car

pe

Dawson Cr

Beav

erto

n Cre

ek

nner Cr

nter

Cr

onat

Lake Oswego

AT

IN

VE

RI

SCHO

Coun

cil

Cr

S. Johns on Cr

Springbrook Cr

Saum Cr

Butternut Cr

CreekMcKay

East

West Fork

Fork

Brons

CedarMill Cr

on Cr

GALES

Creek

SCLO

SECO

APPENDIX A—Hydrographs for Flow Monitoring Sites2003 Tualatin River Flow Management Report A-3

FLOW MONITORING SITES — ALPHABETICAL LISTING BY SITE CODESITE CODE SITE NAME RIVER MILE STATION ID PAGE

CGIC Cherry Grove Intake — Hillsboro 73.3 — A-6DAIRY Dairy Creek at Hwy 8 near Hillsboro, Oregon 2.06 14206200 A-14DLLO Tualatin River near Dilley, Oregon 58.82 14203500 A-12FANO Fanno Creek at Durham Road 1.2 14206950 A-16FRMO Tualatin River at Farmington, Oregon 33.3 14206500 A-15GALES Gales Creek at Old Hwy 47 near Forest Grove, Oregon 2.36 14204530 A-12GASO Tualatin River at Gaston 62.3 14202510 A-7JWCS Joint Water Diversion at SHPP Plant 56.1 — A-13LOCL Lake Oswego Corp. Canal Diversion 6.7 — A-16PVPP TVID—Patton Valley Pump Plant Diversion — A-12PVR1 TVID—Patton Valley River Turnout #1 63.13 — A-7PVR2 TVID—Patton Valley River Turnout #2 64.26 — A-7RCTV Rock Creek at Hwy 8 near Hillsboro, Oregon 1.2 14206450 A-15ROOD Tualatin River at Rood Bridge Road near Hillsboro, Oregon 38.4 14206440 A-14SCHO Sain Creek above Hagg Lake 1.6 14202920 A-8SCLO Scoggins Creek above Henry Hagg Lake near Gaston, Oregon 8.0 14202850 A-8SCO Scoggins Reservoir — — A-4SCOO Scoggins Creek below Henry Hagg Lake near Gaston, Oregon 4.80 14202980 A-11SHPP TVID–Springhill Pump Plant Diversion 56.1 — A-13TANO Tanner Creek above Hagg Lake 1.6 14202860 A-9TBRC Barney Reservoir — — A-4TRGC Tualatin River at Golf Course Road near Cornelius, Oregon 51.5 14204800 A-13TRJB Tualatin River at Hwy 219 Bridge 44.4 14206239 A-14TRLF Tualatin River below Lee Falls 70.7 14202450 A-6TRNF Barney Release to North Fork Trask River — — A-6TRTR Barney Release to Tualatin River 78.0 — A-5USADH CWS Durham WWTP 9.33 — A-16USARC CWS Rock Creek WWTP 38.08 — A-15WAPO Wapato Canal Diversion 61.9 — A-8WSLO Tualatin River at West Linn 1.75 14207500 A-17

OTHER — ALPHABETICAL LISTING BY SITE CODESITE CODE SITE NAME PAGE

PrecipitationStations

FGOP Forest Grove Precipitation Station A-18GSTP Tualatin River at Gaston Precipitation Station A-17HFOP Haines Falls Precipitation Station A-18JWOP Joint Water Plant Precipitation Station A-19SCOP Scoggins Reservoir Precipitation Station A-18SDMO Saddle Mountain Precipitation Station A-19SECO Sain Creek Precipitation Station A-19

ScogginsReleases

SCO Other Scoggins Reservoir Other Deliveries A-4SRBV Beaverton Release from Scoggins Reservoir A-10SRCI Scoggins Reservoir Measured Inflow A-11SRFG Forest Grove Release from Scoggins Reservoir A-10SRHL Hillsboro Release from Scoggins Reservoir A-9SRLO LOC Release from Scoggins Reservoir A-11SRTV TVID Release from Scoggins Reservoir A-9SRUS CWS Release from Scoggins Reservoir A-10

BarneyReleases

TRWQ CWS/Barney Release for Water Quality A-5TREX Barney Release for Exchange A-5


2002

2003

2002

2003

BARNEY RESERVOIR CONTENT(TBRC)

0

5,000

10,000

15,000

20,000

25,000

5/1

5/16

5/31

6/15

6/30

7/15

7/30

8/14

8/29

9/13

9/28

10/1

3

10/2

8

11/1

2

11/2

7

12/1

2

12/2

7

Acr

e F

eet

2002

2003

SCOGGINS RESERVOIR STORAGE CONTENT(SCO)

0

20,000

40,000

60,000

SCOGGINS RESERVOIR OTHER DELIVERIES(SCO Other)

0

2

4

6

Source Agency: District 18 Watermaster

25

50

75

100 Percen

t of F

ull P

oo

l

Acr

e F

eet


37.3

55.9

93.2 Percen

t of F

ull P

oo

l

5/1

5/16

5/31

6/15

6/30

7/15

7/30

8/14

8/29

9/13

9/28

10/1

3

10/2

8

11/1

2

11/2

7

12/1

2

12/2

7

CF

S


5/1

5/16

5/31

6/15

6/30

7/15

7/30

8/14

8/29

9/13

9/28

10/1

3

10/2

8

11/1

2

11/2

7

12/1

2

12/2

7

74.6

18.6

50,000

30,000

20,000


2002

2003

2002

2003

2002

2003

BARNEY RELEASE (TOTAL) TO TUALATIN RIVER [RM 78.0](TRTR)

0

20

40

60

80

CWS/BARNEY RELEASE FOR WATER QUALITY(TRWQ)

0

10

20

30

40

BARNEY RELEASE FOR EXCHANGE(TREX)

0.0

0.5

1.0

1.5

2.0

CF

S


CF

S


5/1

5/16

5/31

6/15

6/30

7/15

7/30

8/14

8/29

9/13

9/28

10/1

3

10/2

8

11/1

2

11/2

7

12/1

2

12/2

7

5/1

5/16

5/31

6/15

6/30

7/15

7/30

8/14

8/29

9/13

9/28

10/1

3

10/2

8

11/1

2

11/2

7

12/1

2

12/2

7

CF

S


5/1

5/16

5/31

6/15

6/30

7/15

7/30

8/14

8/29

9/13

9/28

10/1

3

10/2

8

11/1

2

11/2

7

12/1

2

12/2

7


2002

2003

2002

2003

2002

2003

BARNEY RELEASE TO NORTH FORK TRASK RIVER(TRNF)

0

2

4

6

8

10

CHERRY GROVE INTAKE – HILLSBORO [RM 73.3](CGIC)

0

1

2

3

4

TUALATIN RIVER BELOW LEE FALLS [RM 70.7](TRLF — 14202450)

0

20

40

60

80

100

120

140

CF

S


5/1

5/16

5/31

6/15

6/30

7/15

7/30

8/14

8/29

9/13

9/28

10/1

3

10/2

8

11/1

2

11/2

7

12/1

2

12/2

7

CF

S


5/1

5/16

5/31

6/15

6/30

7/15

7/30

8/14

8/29

9/13

9/28

10/1

3

10/2

8

11/1

2

11/2

7

12/1

2

12/2

7

CF

S


5/1

5/16

5/31

6/15

6/30

7/15

7/30

8/14

8/29

9/13

9/28

10/1

3

10/2

8

11/1

2

11/2

7

12/1

2

12/2

7


2002

2003

CF

S


5/1

5/16

5/31

6/15

6/30

7/15

7/30

8/14

8/29

9/13

9/28

10/1

3

10/2

8

11/1

2

11/2

7

12/1

2

12/2

7

TUALATIN RIVER AT GASTON [RM 62.3](GASO — 14202510)

0

50

100

150

200

TVID — PATTON VALLEY RIVER TURNOUT #1 [RM 63.13](PVR1)

0

1

2

3

4

5

TVID — PATTON VALLEY RIVER TURNOUT #2 [RM 64.26](PVR2)

0.0

0.5

1.0

1.5

2.0

2.5

CF

S


5/1

5/16

5/31

6/15

6/30

7/15

7/30

8/14

8/29

9/13

9/28

10/1

3

10/2

8

11/1

2

11/2

7

12/1

2

12/2

7

CF

S


5/1

5/16

5/31

6/15

6/30

7/15

7/30

8/14

8/29

9/13

9/28

10/1

3

10/2

8

11/1

2

11/2

7

12/1

2

12/2

7

2002

2003

2002

2003


2002

2003

2002

2003

2002

2003

WAPATO CANAL DIVERSION [RM 62.0](WAPO)

0

5

10

15

20

25

30

SCOGGINS CREEK ABOVE HENRY HAGG LAKE NEAR HILLSBORO, OREGON [RM 8.0](SCLO — 14202850)

0

10

20

30

40

50

60

70

80

90

100

SAIN CREEK ABOVE HAGG LAKE [RM 1.6](SCHO — 14202920)

0

5

10

15

20

CF

S


5/1

5/16

5/31

6/15

6/30

7/15

7/30

8/14

8/29

9/13

9/28

10/1

3

10/2

8

11/1

2

11/2

7

12/1

2

12/2

7

CF

S


5/1

5/16

5/31

6/15

6/30

7/15

7/30

8/14

8/29

9/13

9/28

10/1

3

10/2

8

11/1

2

11/2

7

12/1

2

12/2

7

CF

S


5/1

5/16

5/31

6/15

6/30

7/15

7/30

8/14

8/29

9/13

9/28

10/1

3

10/2

8

11/1

2

11/2

7

12/1

2

12/2

7


2002

2003

2002

2003

2002

2003

TANNER CREEK ABOVE HAGG LAKE [RM 1.6](TANO — 14202860)

0.0

0.5

1.0

1.5

2.0

2.5

3.0

3.5

4.0

SCOGGINS RESERVOIR MEASURED INFLOW(SRCI)

0

15

30

45

60

75

90

105

120

135

150

TVID RELEASE FROM SCOGGINS RESERVOIR(SRTV)

0

25

50

75

100

125

CF

S


5/1

5/16

5/31

6/15

6/30

7/15

7/30

8/14

8/29

9/13

9/28

10/1

3

10/2

8

11/1

2

11/2

7

12/1

2

12/2

7

CF

S


5/1

5/16

5/31

6/15

6/30

7/15

7/30

8/14

8/29

9/13

9/28

10/1

3

10/2

8

11/1

2

11/2

7

12/1

2

12/2

7

CF

S


5/1

5/16

5/31

6/15

6/30

7/15

7/30

8/14

8/29

9/13

9/28

10/1

3

10/2

8

11/1

2

11/2

7

12/1

2

12/2

7


2002

2003

2002

2003

2002

2003

CWS RELEASE FROM SCOGGINS RESERVOIR(SRUS)

0

20

40

60

80

100

BEAVERTON RELEASE FROM SCOGGINS RESERVOIR(SRBV)

0

5

10

15

20

25

FOREST GROVE RELEASE FROM SCOGGINS RESERVOIR(SRFG)

0

2

4

6

8

10

CF

S

5/1

5/16

5/31

6/15

6/30

7/15

7/30

8/14

8/29

9/13

9/28

10/1

3

10/2

8

11/1

2

11/2

7

12/1

2

12/2

7

CF

S


5/1

5/16

5/31

6/15

6/30

7/15

7/30

8/14

8/29

9/13

9/28

10/1

3

10/2

8

11/1

2

11/2

7

12/1

2

12/2

7

CF

S


5/1

5/16

5/31

6/15

6/30

7/15

7/30

8/14

8/29

9/13

9/28

10/1

3

10/2

8

11/1

2

11/2

7

12/1

2

12/2

7



2002

2003

2002

2003

2002

2003

HILLSBORO RELEASE FROM SCOGGINS RESERVOIR(SRHL)

0

10

20

30

LOC RELEASE FROM SCOGGINS RESERVOIR(SRLO)

0

1

2

6

7

SCOGGINS CREEK BELOW HENRY HAGG LAKE NEAR GASTON, OREGON [RM 4.8](SCOO – 14202980)

0

50

100

150

200

250

CF

S


5/1

5/16

5/31

6/15

6/30

7/15

7/30

8/14

8/29

9/13

9/28

10/1

3

10/2

8

11/1

2

11/2

7

12/1

2

12/2

7

CF

S


5/1

5/16

5/31

6/15

6/30

7/15

7/30

8/14

8/29

9/13

9/28

10/1

3

10/2

8

11/1

2

11/2

7

12/1

2

12/2

7

CF

S


5/1

5/16

5/31

6/15

6/30

7/15

7/30

8/14

8/29

9/13

9/28

10/1

3

10/2

8

11/1

2

11/2

7

12/1

2

12/2

7

5

4

3


2002

2003

2002

2003

2002

2003

TVID — PATTON VALLEY PUMP PLANT DIVERSION(PVPP)

0

1

2

3

4

5

TUALATIN RIVER NEAR DILLEY, OREGON [RM 58.82](DLLO — 14203500)

0

50

100

150

200

250

300

350

GALES CREEK ON OLD HWY 47 BRIDGE NEAR FOREST GROVE, OREGON [RM 2.36](GALES — 14204530)

0

30

60

90

120

150

180

CF

S


5/1

5/16

5/31

6/15

6/30

7/15

7/30

8/14

8/29

9/13

9/28

10/1

3

10/2

8

11/1

2

11/2

7

12/1

2

12/2

7

CF

S


5/1

5/16

5/31

6/15

6/30

7/15

7/30

8/14

8/29

9/13

9/28

10/1

3

10/2

8

11/1

2

11/2

7

12/1

2

12/2

7

CF

S


5/1

5/16

5/31

6/15

6/30

7/15

7/30

8/14

8/29

9/13

9/28

10/1

3

10/2

8

11/1

2

11/2

7

12/1

2

12/2

7


2002

2003

2002

2003

2002

2003

CF

S


5/1

5/16

5/31

6/15

6/30

7/15

7/30

8/14

8/29

9/13

9/28

10/1

3

10/2

8

11/1

2

11/2

7

12/1

2

12/2

7

TVID — SPRINGHILL PUMP PLANT DIVERSION [RM 56.1](SHPP)

0

20

40

80

100

JOINT WATER DIVERSION AT SHPP PLANT [RM 56.1](JWCS)

0

15

30

45

90

TUALATIN RIVER AT GOLF COURSE ROAD NEAR CORNELIUS, OREGON [RM 51.5](TRGC — 14204800)

0

75

150

225

300

375

450

CF

S


5/1

5/16

5/31

6/15

6/30

7/15

7/30

8/14

8/29

9/13

9/28

10/1

3

10/2

8

11/1

2

11/2

7

12/1

2

12/2

7

CF

S


5/1

5/16

5/31

6/15

6/30

7/15

7/30

8/14

8/29

9/13

9/28

10/1

3

10/2

8

11/1

2

11/2

7

12/1

2

12/2

7

60

75

60


2002

2003

2002

2003

2002

2003

CF

S


5/1

5/16

5/31

6/15

6/30

7/15

7/30

8/14

8/29

9/13

9/28

10/1

3

10/2

8

11/1

2

11/2

7

12/1

2

12/2

7

DAIRY CREEK AT HWY 8 NEAR HILLSBORO, OREGON [RM 2.06](DAIRY — 14206200)

0

200

300

400

TUALATIN RIVER AT HWY 219 BRIDGE [RM 44.4](TRJB — 14206239)

0

300

600

900

TUALATIN RIVER AT ROOD BRIDGE ROAD NEAR HILLSBORO, OREGON [RM 38.4](ROOD — 14206440)

0

200

400

600

800

CF

S


5/1

5/16

5/31

6/15

6/30

7/15

7/30

8/14

8/29

9/13

9/28

10/1

3

10/2

8

11/1

2

11/2

7

12/1

2

12/2

7

CF

S


5/1

5/16

5/31

6/15

6/30

7/15

7/30

8/14

8/29

9/13

9/28

10/1

3

10/2

8

11/1

2

11/2

7

12/1

2

12/2

7

150

100

750

450

Station removed for bridge construction project.Estimated to be back online April 2004.


2002

2003

2002

2003

2002

2003

CF

S


5/1

5/16

5/31

6/15

6/30

7/15

7/30

8/14

8/29

9/13

9/28

10/1

3

10/2

8

11/1

2

11/2

7

12/1

2

12/2

7

ROCK CREEK AT HWY 8 NEAR HILLSBORO, OREGON [RM 1.2](RCTV — 14206450)

0

40

60

80

CWS ROCK CREEK WWTP DISCHARGE [RM 38.08 Tualatin R](USARC)

0

10

40

50

60

TUALATIN RIVER AT FARMINGTON RD BRIDGE [RM 33.3](FRMO – 14206500)

0

200

800

1000

CF

S


5/1

5/16

5/31

6/15

6/30

7/15

7/30

8/14

8/29

9/13

9/28

10/1

3

10/2

8

11/1

2

11/2

7

12/1

2

12/2

7

CF

S


5/1

5/16

5/31

6/15

6/30

7/15

7/30

8/14

8/29

9/13

9/28

10/1

3

10/2

8

11/1

2

11/2

7

12/1

2

12/2

7

20

30

20

600

400


2002

2003

2002

2003

2002

2003

CF

S


5/1

5/16

5/31

6/15

6/30

7/15

7/30

8/14

8/29

9/13

9/28

10/1

3

10/2

8

11/1

2

11/2

7

12/1

2

12/2

7

FANNO CREEK AT DURHAM ROAD [RM 1.2](FANO — 14206950)

0

40

160

CWS DURHAM WWTP DISCHARGE [RM 9.33 Tualatin R](USADH)

0

20

30

40

LAKE OSWEGO CORP. CANAL DIVERSION [RM 6.7](LOCL)

CF

S


5/1

5/16

5/31

6/15

6/30

7/15

7/30

8/14

8/29

9/13

9/28

10/1

3

10/2

8

11/1

2

11/2

7

12/1

2

12/2

7

CF

S


5/1

5/16

5/31

6/15

6/30

7/15

7/30

8/14

8/29

9/13

9/28

10/1

3

10/2

8

11/1

2

11/2

7

12/1

2

12/2

7

10

120

80

0

10

30

35

40

20

25

5

15


2003

TUALATIN RIVER AT GASTON STATION [RM 3.45] (GSTP)PREVIOUS 7 DAYS ACCUMULATED PRECIPITATION

Inch

es


5/1

5/16

5/31

6/15

6/30

7/15

7/30

8/14

8/29

9/13

9/28

10/1

3

10/2

8

11/1

2

11/2

7

12/1

2

12/2

7

0.0

0.5

1.0

2.0

1.5

2002

2003

TUALATIN RIVER AT WEST LINN [RM 1.75](WSLO — 14207500)

CF

S


5/1

5/16

5/31

6/15

6/30

7/15

7/30

8/14

8/29

9/13

9/28

10/1

3

10/2

8

11/1

2

11/2

7

12/1

2

12/2

7

0

800

1000

1400

400

600

200

1200


2002

2003

2002

2003

2002

2003

Inch

es


5/1

5/16

5/31

6/15

6/30

7/15

7/30

8/14

8/29

9/13

9/28

10/1

3

10/2

8

11/1

2

11/2

7

12/1

2

12/2

7

SCOGGINS RESERVOIR STATION (SCOP)PREVIOUS 7 DAYS ACCUMULATED PRECIPITATION

0.0

0.25

0.50

1.00

1.50

FOREST GROVE STATION (FGOP)PREVIOUS 7 DAYS ACCUMULATED PRECIPITATION

HAINES FALLS STATION (HFOP)PREVIOUS 7 DAYS ACCUMULATED PRECIPITATION

Inch

es


5/1

5/16

5/31

6/15

6/30

7/15

7/30

8/14

8/29

9/13

9/28

10/1

3

10/2

8

11/1

2

11/2

7

12/1

2

12/2

7

Inch

es


5/1

5/16

5/31

6/15

6/30

7/15

7/30

8/14

8/29

9/13

9/28

10/1

3

10/2

8

11/1

2

11/2

7

12/1

2

12/2

7

0.75

1.25

0.0

0.5

1.0

2.0

1.5

0.0

0.5

1.0

2.0

3.5

3.0

1.5

2.5


Inch

es


5/1

5/16

5/31

6/15

6/30

7/15

7/30

8/14

8/29

9/13

9/28

10/1

3

10/2

8

11/1

2

11/2

7

12/1

2

12/2

7

JOINT WATER PLANT STATION (JWOP)PREVIOUS 7 DAYS ACCUMULATED PRECIPITATION

0.0

0.50

0.75

1.25

1.50

SAIN CREEK STATION (SECO)PREVIOUS 7 DAYS ACCUMULATED PRECIPITATION

SADDLE MOUNTAIN STATION (SDMO)PREVIOUS 7 DAYS ACCUMULATED PRECIPITATION

Inch

es


5/1

5/16

5/31

6/15

6/30

7/15

7/30

8/14

8/29

9/13

9/28

10/1

3

10/2

8

11/1

2

11/2

7

12/1

2

12/2

7

Inch

es


5/1

5/16

5/31

6/15

6/30

7/15

7/30

8/14

8/29

9/13

9/28

10/1

3

10/2

8

11/1

2

11/2

7

12/1

2

12/2

7

1.00

0

0.5

3.0

1.5

1.0

2.5

2.0

0

0.5

3.0

1.5

1.0

2.5

2.0

0.25

2002

2003

2002

2003

2002

2003

(this page intentionally blank)

AAAAppppppppeeeennnnddddiiiixxxx BBBB

DDDDaaaattttaaaa TTTTaaaabbbblllleeeessss &&&& HHHHyyyyddddrrrrooooggggrrrraaaapppphhhhssssffffoooorrrr NNNNaaaattttuuuurrrraaaallll FFFFlllloooowwww DDDDeeeetttteeeerrrrmmmmiiiinnnnaaaattttiiiioooonnnn

The following information is used at monthly meetings to evaluate flows in the Tualatin Basin. These are provisional data and have not been reviewed or edited. Some of the data represent daily mean flows and some represent instantaneous measurements.

The data in Appendix E have been reviewed and edited for quality.

APPENDIX B—Data Tables & Hydrographs for Natural Flow DeterminationB-2 2003 Tualatin River Flow Management Report

NATURAL FLOW SITES — LOCATION

Fanno Creek

Cr

Cr

Cr

S. Rock

McF

ee C

r

Christensen

Creek

Creek

Rock

Gales

Creek

SCHO

DLLO

TRLF

Scog

Barney Reservoir

Scoggins Reservoir

TRJB

ROOD

TRGC

FRMO

Lake Oswego

WI L L A M

E T T E RI V

ER

TU

AL

R


Withdrawal Points


WSLO

Dairy

Creek

Burris Cr

He Cr

Baker CrChicken

Cedar Cr

Canal

(Hagg Lake)

Ash C

r

Hedges C

r

Sain Cr

Ta

gins

Car

pe

Dawson Cr

Beav

erto

n Cre

ek

nner Cr

nter

Cr

onat

Lake Oswego

AT

IN

VE

RI

Coun

sil

Cr

S. Johns on Cr

Saum Cr

GASO

Springbrook Cr

Butternut Cr

CreekMcKay

East

West Fork

Fork

Brons

CedarMill Cr

on Cr

North


APPENDIX B—Data Tables & Hydrographs for Natural Flow Determination2003 Tualatin River Flow Management Report B-3

*Rood Bridge station removed for bridge construction project; estimated to be back on line April 2004.

NATURAL FLOW SITES — ALPHABETICAL LISTING BY SITE CODESITE CODE SITE NAME RIVER MILE STATION ID PAGE

DLLO Tualatin River at Dilley 58.82 14203500 B-6

FRMO Tualatin River at Farmington Rd Bridge 33.3 14206500 B-9

GASO Tualatin River at Gaston 62.3 14202510 B-5

ROOD Tualatin River at Rood Bridge* 38.4 14206440 —

TRGC Tualatin River at Golf Course Road 51.5 14204800 B-7

TRJB Tualatin River at Hwy 219 Bridge 44.4 14206239 B-8

TRLF Tualatin River below Lee Falls 70.5 14202450 B-4

WSLO Tualatin River at West Linn 1.75 14207500 B-10


NFTRLF – 14202450 – NATURAL FLOW AT TUALATIN RIVER BELOW LEE FALLS [RM 70.5]

Abbreviations: NFTRLF=Natural Flow at Tualatin River below Lee Falls; TRLF=Tualatin River Flow at Lee Falls; TRTR=Barney Release to Tualatin River.Calculations: NFTRLF=TRLF–STORAGE; STORAGE=TRTR-LOSS

DATE2003 Daily Mean Discharge in Cubic Feet per Second

NFTRLF TRLF STORAGE TRTR LOSS (2%)6-May — — — — —13-May — — — — —20-May 50.10 50.10 0.00 0.00 0.0027-May 38.60 38.60 0.00 0.00 0.003-Jun 29.98 48.60 18.62 19.00 0.3810-Jun 27.02 42.70 15.68 16.00 0.3217-Jun 21.24 37.90 16.66 17.00 0.3424-Jun 19.42 44.90 25.48 26.00 0.521-Jul 17.42 47.80 30.38 31.00 0.628-Jul 14.52 44.90 30.38 31.00 0.6215-Jul 12.52 47.80 35.28 36.00 0.7222-Jul 10.90 50.10 39.20 40.00 0.8029-Jul 7.90 47.10 39.20 40.00 0.805-Aug 5.10 54.10 49.00 50.00 1.0012-Aug 1.72 56.60 54.88 56.00 1.1219-Aug -0.28 64.40 64.68 66.00 1.3226-Aug -1.18 63.50 64.68 66.00 1.322-Sep -2.98 61.70 64.68 66.00 1.329-Sep 6.22 70.90 64.68 66.00 1.3216-Sep 8.58 51.70 43.12 44.00 0.8823-Sep 2.68 36.00 33.32 34.00 0.6830-Sep 3.98 37.30 33.32 34.00 0.687-Oct 13.98 47.30 33.32 34.00 0.6814-Oct 29.54 41.30 11.76 12.00 0.2421-Oct 34.60 34.60 0.00 0.00 0.0028-Oct 12.20 12.20 0.00 0.00 0.004-Nov 11.60 11.60 0.00 0.00 0.00

CF

S


5/1

5/16

5/31

6/15

6/30

7/15

7/30

8/14

8/29

9/13

9/28

10/1

3

10/2

8

11/1

2

11/2

7

12/1

2

NATURAL FLOW TUALATIN RIVER BELOW LEE FALLS [RM 70.5](NFTRLF — 14202450)

0

20

40

60

100

80

Measured

Natural

Storage


NFGASO – 14202510 – NATURAL FLOW AT TUALATIN RIVER AT GASTON [RM 62.3]

Abbreviations: NFGSTO=Natural Flow at Tualatin River at Gaston; GSTO=Tualatin River Flow atGaston; TRTR=Barney Release to Tualatin River; PVR2=TVID–Patton River Turnout DiversionCalculations: NFGASO=GASO–STORAGE; STORAGE=TRTR+PVR2-LOSS


NFGASO GASO STORAGE TRTR PVR2 LOSS (3%)6-May 157.00 157.00 0.00 0.00 0.00 0.0013-May 98.00 98.00 0.00 0.00 0.00 0.0020-May 80.00 80.00 0.00 0.00 0.00 0.0027-May 56.00 56.00 0.00 0.00 0.00 0.003-Jun 44.57 63.00 18.43 19.00 0.00 0.5710-Jun 37.48 53.00 15.52 16.00 0.00 0.4817-Jun 26.01 42.50 16.49 17.00 0.00 0.5124-Jun 27.78 53.00 25.22 26.00 0.00 0.781-Jul 21.93 52.00 30.07 31.00 0.00 0.938-Jul 16.93 47.00 30.07 31.00 0.00 0.9315-Jul 14.08 49.00 34.92 36.00 0.00 1.0822-Jul 10.20 49.00 38.80 40.00 0.00 1.2029-Jul 12.20 51.00 38.80 40.00 0.00 1.205-Aug 11.50 60.00 48.50 50.00 0.00 1.5012-Aug 10.68 65.00 54.32 56.00 0.00 1.6819-Aug 9.98 74.00 64.02 66.00 0.00 1.9826-Aug 8.98 73.00 64.02 66.00 0.00 1.982-Sep 8.98 73.00 64.02 66.00 0.00 1.989-Sep 21.98 86.00 64.02 66.00 0.00 1.9816-Sep 17.32 60.00 42.68 44.00 0.00 1.3223-Sep 10.02 43.00 32.98 34.00 0.00 1.0230-Sep 10.02 43.00 32.98 34.00 0.00 1.027-Oct 27.02 60.00 32.98 34.00 0.00 1.0214-Oct 43.36 55.00 11.64 12.00 0.00 0.3621-Oct 38.00 38.00 0.00 0.00 0.00 0.0028-Oct 18.00 18.00 0.00 0.00 0.00 0.004-Nov 16.00 16.00 0.00 0.00 0.00 0.00

Measured

Natural

Storage

NATURAL FLOW AT TUALATIN RIVER GASTON [RM 62.3](NFGASO – 14202510)

0

175

CF

S


75

100

25

5/1

5/16

5/31

6/15

6/30

7/15

7/30

8/14

8/29

9/13

9/28

10/1

3

10/2

8

11/1

2

11/2

7

12/1

2

50

125

150


DLLO – 14203500 – NATURAL FLOW AT TUALATIN RIVER AT DILLEY [RM 58.82]

Abbreviations: NFDLLO=Natural Flow at Tualatin River at Dilley; DLLO=Tualatin River Flow at Dilley; TRTR=Barney Release to Tualatin River; SRUS, SRTV, SRHL, SRFG, SRLO and SRBV= Releases from Scoggins Reservoir for CWS, TVID, Hillsboro, Forest Grove, LOC and Beaverton, respectivelyCalculations: NFDLLO=DLLO–STORAGE; STORAGE=TRTR+SRUS+(0.95*SRTV)+SRHL+SRFG+SRLO+SRBV+Other-LOSS


NFDLLO DLLO STORAGE TRTR SRUS SRTV SRHL SRFG SRLO SRBV Other LOSS (1.0%)6-May 255.00 255.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.0013-May 154.01 155.00 0.99 0.00 0.00 0.00 0.00 0.00 0.00 0.00 1.00 0.01

20-May 133.01 134.00 0.99 0.00 0.00 0.00 0.00 0.00 0.00 0.00 1.00 0.0127-May 122.01 123.00 0.99 0.00 0.00 0.00 0.00 0.00 0.00 0.00 1.00 0.01

3-Jun 66.49 125.00 58.51 19.00 0.00 18.00 11.00 4.00 0.00 6.00 2.00 0.5910-Jun 44.06 144.00 99.94 16.00 0.00 41.00 22.00 4.00 0.00 16.00 4.00 1.01

17-Jun 32.93 150.00 117.07 17.00 0.00 55.00 21.00 5.00 0.00 20.00 3.00 1.1824-Jun 33.95 148.00 114.05 26.00 0.00 56.00 15.00 6.00 0.00 12.00 3.00 1.151-Jul 17.50 166.00 148.50 31.00 0.00 80.00 16.00 7.00 0.00 17.00 3.00 1.50

8-Jul 32.41 197.00 164.59 31.00 0.00 95.00 18.00 7.00 4.00 13.00 3.00 1.6615-Jul 26.62 207.00 180.38 36.00 10.00 96.00 21.00 6.00 4.00 11.00 3.00 1.82

22-Jul 17.03 213.00 195.97 40.00 20.00 101.00 7.00 9.00 4.00 19.00 3.00 1.9829-Jul 11.48 222.00 210.52 40.00 20.00 107.00 13.00 8.00 4.00 22.00 4.00 2.135-Aug 14.18 255.00 240.82 50.00 50.00 115.00 22.00 5.00 3.00 0.00 4.00 2.4312-Aug -14.72 236.00 250.72 56.00 63.00 115.00 20.00 0.00 2.00 0.00 3.00 2.5319-Aug -1.89 222.00 223.89 66.00 58.00 77.00 13.00 9.00 3.00 0.00 4.00 2.2626-Aug 7.13 238.00 230.87 66.00 68.00 76.00 13.00 7.00 3.00 0.00 4.00 2.332-Sep -2.26 220.00 222.26 66.00 58.00 70.00 5.00 4.00 3.00 17.00 5.00 2.259-Sep 23.90 217.00 193.10 66.00 48.00 59.00 0.00 2.00 3.00 16.00 4.00 1.9516-Sep 19.63 166.00 146.37 44.00 40.00 43.00 5.00 4.00 0.00 10.00 4.00 1.4823-Sep 13.37 189.00 175.63 34.00 60.00 52.00 14.00 5.00 1.00 11.00 3.00 1.7730-Sep 16.77 202.00 185.23 34.00 60.00 58.00 18.00 5.00 0.00 12.00 3.00 1.877-Oct 40.93 197.00 156.07 34.00 60.00 27.00 15.00 7.00 0.00 13.00 3.00 1.5814-Oct 65.91 136.00 70.09 12.00 20.00 24.00 8.00 0.00 0.00 6.00 2.00 0.7121-Oct 72.86 123.00 50.14 0.00 20.00 7.00 0.00 7.00 0.00 16.00 1.00 0.5128-Oct 50.82 152.00 101.18 0.00 60.00 16.00 0.00 5.00 0.00 21.00 1.00 1.024-Nov 64.53 152.00 87.47 0.00 50.00 13.00 0.00 26.00 0.00 0.00 0.00 0.88

Measured

Natural

Storage

NATURAL FLOW AT TUALATIN RIVER AT DILLEY [RM 58.82](NFDLLO — 14203500)

CF

S


0

160

280

80

120

40

5/1

5/16

5/31

6/15

6/30

7/15

7/30

8/14

8/29

9/13

9/28

10/1

3

10/2

8

11/1

2

11/2

7

12/1

2

240

200


NFTRGC – 14204800 – NATURAL FLOW AT TUALATIN RIVER AT GOLF COURSE ROAD [RM 51.5]

Abbreviations: NFTRGC=Natural Flow at Tualatin River at Golf Course Road; TRGC=Tualatin River Flow at Golf Course Rd; TRWQ= Release from Barney Reservoir for CWS; SRUS, SRTV, and, SRLO= Releases from Scoggins Reservoir for CWS, TVID and LOC, respectivelyCalculations: NFTRGC=TRGC–STORAGE; STORAGE=TRWQ+ SRUS+(0.16*SRTV)+SRLO-LOSS


NFTRGC TRGC STORAGE TRWQ SRUS SRTV SRLOLOSS (3.4%)

6-May 415.00 415.00 0.00 0.00 0.00 0.00 0.00 0.0013-May 255.00 255.00 0.00 0.00 0.00 0.00 0.00 0.0020-May 185.00 185.00 0.00 0.00 0.00 0.00 0.00 0.0027-May 140.00 140.00 0.00 0.00 0.00 0.00 0.00 0.003-Jun 74.22 77.00 2.78 0.00 0.00 18.00 0.00 0.1010-Jun 91.66 98.00 6.34 0.00 0.00 41.00 0.00 0.2217-Jun 80.50 89.00 8.50 0.00 0.00 55.00 0.00 0.3024-Jun 77.34 86.00 8.66 0.00 0.00 56.00 0.00 0.301-Jul 73.64 86.00 12.36 0.00 0.00 80.00 0.00 0.448-Jul 50.45 69.00 18.55 0.00 0.00 95.00 4.00 0.6515-Jul 53.64 82.00 28.36 0.00 10.00 96.00 4.00 1.0022-Jul 32.21 71.00 38.79 0.00 20.00 101.00 4.00 1.3729-Jul 29.28 69.00 39.72 0.00 20.00 107.00 4.00 1.405-Aug 51.03 120.00 68.97 0.00 50.00 115.00 3.00 2.4312-Aug 63.44 144.00 80.56 0.00 63.00 115.00 2.00 2.8419-Aug 13.17 98.00 84.83 14.00 58.00 77.00 3.00 2.4926-Aug 35.67 130.00 94.33 14.00 68.00 76.00 3.00 2.832-Sep 33.25 117.00 83.75 14.00 58.00 70.00 3.00 2.459-Sep 82.61 155.00 72.39 14.00 48.00 59.00 3.00 2.0516-Sep 51.71 111.00 59.29 14.00 40.00 43.00 0.00 1.5923-Sep 30.04 111.00 80.96 14.00 60.00 52.00 1.00 2.3630-Sep 44.08 125.00 80.92 14.00 60.00 58.00 0.00 2.367-Oct 64.87 141.00 76.13 14.00 60.00 27.00 0.00 2.1914-Oct 83.97 121.00 37.03 14.00 20.00 24.00 0.00 0.8121-Oct 68.60 89.00 20.40 0.00 20.00 7.00 0.00 0.7228-Oct 39.57 100.00 60.43 0.00 60.00 16.00 0.00 2.134-Nov 53.69 104.00 50.31 0.00 50.00 13.00 0.00 1.77

Measured

Natural

Storage

CF

S


5/1

5/16

5/31

6/15

6/30

7/15

7/30

8/14

8/29

9/13

9/28

10/1

3

10/2

8

11/1

2

11/2

7

12/1

2

NATURAL FLOW AT TUALATIN RIVER AT GOLF COURSE ROAD [RM 51.5](NFTRGC — 14204800)

0

90

180

450

270

360


NFTRJB – 14206239 – NATURAL FLOW AT TUALATIN RIVER AT HWY 219 BRIDGE [RM 44.4]

Abbreviations: NFTRJB=Natural Flow at Tualatin River at Hwy 219 Bridge; TRJB=Tualatin River Flow at Hwy 219 Bridge; TRWQ= Release from Barney Reservoir for CWS; SRUS, SRTV, and, SRLO= Releases from Scoggins Reservoir for CWS, TVID and LOC, respectivelyCalculations: NFTRJB=TRJB–STORAGE; STORAGE=TRWQ + SRUS+(0.11*SRTV)+SRLO-LOSS


NFTRJB TRJB STORAGE TRWQ SRUS SRTV SRLOLOSS (5.2%)

6-May 766.00 766.00 0.00 0.00 0.00 0.00 0.00 0.0013-May20-May27-May3-Jun 152.12 154.00 1.88 0.00 0.00 18.00 0.00 0.1010-Jun17-Jun 128.26 134.00 5.74 0.00 0.00 55.00 0.00 0.3124-Jun 125.16 131.00 5.84 0.00 0.00 56.00 0.00 0.321-Jul 113.66 122.00 8.34 0.00 0.00 80.00 0.00 0.468-Jul 66.60 80.30 13.70 0.00 0.00 95.00 4.00 0.7515-Jul 62.32 85.60 23.28 0.00 10.00 96.00 4.00 1.2822-Jul 32.82 66.10 33.28 0.00 20.00 101.00 4.00 1.8329-Jul 28.39 62.30 33.91 0.00 20.00 107.00 4.00 1.865-Aug 39.76 102.00 62.24 0.00 50.00 115.00 3.00 3.4112-Aug 70.39 144.00 73.61 0.00 63.00 115.00 2.00 4.0419-Aug 22.14 102.00 79.86 14.00 58.00 77.00 3.00 3.6126-Aug 26.77 116.00 89.23 14.00 68.00 76.00 3.00 4.132-Sep 28.87 108.00 79.13 14.00 58.00 70.00 3.00 3.579-Sep 87.50 156.00 68.50 14.00 48.00 59.00 3.00 2.9916-Sep 58.60 115.00 56.40 14.00 40.00 43.00 0.00 2.3323-Sep 20.25 97.50 77.25 14.00 60.00 52.00 1.00 3.4730-Sep 47.07 124.00 76.93 14.00 60.00 58.00 0.00 3.457-Oct 71.30 145.00 73.70 14.00 60.00 27.00 0.00 3.2714-Oct21-Oct 117.31 137.00 19.69 0.00 20.00 7.00 0.00 1.0828-Oct 64.45 123.00 58.55 0.00 60.00 16.00 0.00 3.214-Nov 123.24 172.00 48.76 0.00 50.00 13.00 0.00 2.67

Measured

Natural

Storage

NATURAL FLOW AT TUALATIN RIVER AT HWY 219 BRIDGE [RM 44.40](NFTRJB — 14206239)

0

600

800

CF

S


400

200

5/1

5/16

5/31

6/15

6/30

7/15

7/30

8/14

8/29

9/13

9/28

10/1

3

10/2

8

11/1

2

11/2

7

12/1

2


NFFRMO – 14206500 – NATURAL FLOW AT TUALATIN RIVER AT FARMINGTON [RM 33.3]

Abbreviations: NFFRMO=Natural Flow at Tualatin River at Farmington; FRMO=Tualatin River Flow at Farmington; TRWQ= Release from Barney Reservoir for CWS; SRUS, SRTV, and, SRLO= Releases from Scoggins Reservoir for CWS, TVID and LOC, respectivelyCalculations: NFFRMO=FRMO–STORAGE; STORAGE=TRWQ+ SRUS+(0.07*SRTV)+SRLO-LOSS


NFFRMO FRMO STORAGE TRWQ SRUS SRTV SRLOLOSS (8.0%)

6-May 924.00 924.00 0.00 0.00 0.00 0.00 0.00 0.0013-May 585.00 585.00 0.00 0.00 0.00 0.00 0.00 0.0020-May 418.00 418.00 0.00 0.00 0.00 0.00 0.00 0.0027-May 306.00 306.00 0.00 0.00 0.00 0.00 0.00 0.003-Jun 193.84 195.00 1.16 0.00 0.00 18.00 0.00 0.1010-Jun 193.36 196.00 2.64 0.00 0.00 41.00 0.00 0.2317-Jun 178.46 182.00 3.54 0.00 0.00 55.00 0.00 0.3124-Jun 174.39 178.00 3.61 0.00 0.00 56.00 0.00 0.311-Jul 140.85 146.00 5.15 0.00 0.00 80.00 0.00 0.458-Jul 131.20 141.00 9.80 0.00 0.00 95.00 4.00 0.8515-Jul 120.94 140.00 19.06 0.00 10.00 96.00 4.00 1.6622-Jul 93.42 122.00 28.58 0.00 20.00 101.00 4.00 2.4929-Jul 97.03 126.00 28.97 0.00 20.00 107.00 4.00 2.525-Aug 90.83 147.00 56.17 0.00 50.00 115.00 3.00 4.8812-Aug 108.79 176.00 67.21 0.00 63.00 115.00 2.00 5.8419-Aug 73.92 149.00 75.08 14.00 58.00 77.00 3.00 5.3126-Aug 68.79 153.00 84.21 14.00 68.00 76.00 3.00 6.112-Sep 69.37 144.00 74.63 14.00 58.00 70.00 3.00 5.279-Sep 132.28 197.00 64.72 14.00 48.00 59.00 3.00 4.4116-Sep 93.43 147.00 53.57 14.00 40.00 43.00 0.00 3.4423-Sep 61.53 135.00 73.47 14.00 60.00 52.00 1.00 5.1730-Sep 78.06 151.00 72.94 14.00 60.00 58.00 0.00 5.127-Oct 117.06 188.00 70.94 14.00 60.00 27.00 0.00 4.9514-Oct 229.05 263.00 33.95 14.00 20.00 24.00 0.00 1.7321-Oct 179.15 198.00 18.85 0.00 20.00 7.00 0.00 1.6428-Oct 109.77 166.00 56.23 0.00 60.00 16.00 0.00 4.894-Nov 148.16 195.00 46.84 0.00 50.00 13.00 0.00 4.07

Measured

Natural

Storage

CF

S


5/1

5/16

5/31

6/15

6/30

7/15

7/30

8/14

8/29

9/13

9/28

10/1

3

10/2

8

11/1

2

11/2

7

12/1

2

NATURAL FLOW AT TUALATIN RIVER AT FARMINGTON [RM 33.3](NFFRMO — 14206500)

0

1000

400

200

600

800


NFWSLO – 14207500 – NATURAL FLOW AT TUALATIN RIVER AT WEST LINN [RM 1.75]

Abbreviations: NFWSLO=Natural Flow at Tualatin River at West Linn; WSLO=Tualatin River Flow at West Linn; TRWQ and SRUS = Releases from Barney and Scoggins Reservoirs for CWSCalculations: NFFRMO=FRMO–STORAGE; STORAGE=TRWQ+ SRUS-LOSS


NFWSLO WSLO STORAGE TRWQ SRUS LOSS (16%)6-May 1272.00 1272.00 0.00 0.00 0.00 0.0013-May 845.00 845.00 0.00 0.00 0.00 0.0020-May 667.00 667.00 0.00 0.00 0.00 0.0027-May 496.00 496.00 0.00 0.00 0.00 0.003-Jun 344.00 344.00 0.00 0.00 0.00 0.0010-Jun 313.00 313.00 0.00 0.00 0.00 0.0017-Jun 306.00 306.00 0.00 0.00 0.00 0.0024-Jun 288.00 288.00 0.00 0.00 0.00 0.001-Jul 198.00 198.00 0.00 0.00 0.00 0.008-Jul 195.00 195.00 0.00 0.00 0.00 0.0015-Jul 178.60 187.00 8.40 0.00 10.00 1.6022-Jul 145.20 162.00 16.80 0.00 20.00 3.2029-Jul 140.20 157.00 16.80 0.00 20.00 3.205-Aug 145.00 187.00 42.00 0.00 50.00 8.0012-Aug 212.08 265.00 52.92 0.00 63.00 10.0819-Aug 94.28 157.00 62.72 14.00 58.00 9.2826-Aug 123.88 195.00 71.12 14.00 68.00 10.882-Sep 114.28 177.00 62.72 14.00 58.00 9.289-Sep 223.68 278.00 54.32 14.00 48.00 7.6816-Sep 182.40 230.00 47.60 14.00 40.00 6.4023-Sep 133.60 198.00 64.40 14.00 60.00 9.6030-Sep 150.60 215.00 64.40 14.00 60.00 9.607-Oct 227.60 292.00 64.40 14.00 60.00 9.6014-Oct 370.20 401.00 30.80 14.00 20.00 3.2021-Oct 311.20 328.00 16.80 0.00 20.00 3.2028-Oct 188.60 239.00 50.40 0.00 60.00 9.604-Nov 213.00 255.00 42.00 0.00 50.00 8.00

Measured

Natural

Storage

NATURAL FLOW AT TUALATIN RIVER AT AT WEST LINN [RM 1.75](NFWSLO — 14207500)

0

1200

1400

CF

S


600

1000

400

5/1

5/16

5/31

6/15

6/30

7/15

7/30

8/14

8/29

9/13

9/28

10/1

3

10/2

8

11/1

2

11/2

7

12/1

2

800

200

AAAAppppppppeeeennnnddddiiiixxxx CCCC

SSSSccccooooggggggggiiiinnnnssss RRRReeeesssseeeerrrrvvvvooooiiiirrrr OOOOppppeeeerrrraaaattttiiiioooonnnnssssMMMMoooonnnntttthhhhllllyyyy RRRReeeeccccoooorrrrddddssss

The information presented here regarding water allocations among Hillsboro, Forest Grove and Beaverton is provisional. Final allocations can be found in the Joint Water

Commission/Joint Barney Commission section in the main body of this report.

APPENDIX C—Scoggins Reservoir Operations Monthly ReportsC-2 2003 Tualatin River Flow Management Report

S

CO

GG

INS

DA

M -

RE

SE

RV

OIR

OP

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AT

ION

S

Fo

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fJa

nu

ary

20

03

File

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03

----

---

INF

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W -

----

----

---

----

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HA

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----

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WA

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S -

----

----

----

----

SC

HO

SC

LO

TA

NO

TO

TA

L W

.S.

ST

OR

CH

NG

CH

NG

CO

MP

GA

SO

DLLO

GO

LF

RO

OD

FR

MO

WS

LO

T

EM

PT

VID

US

AL

OH

LS

FG

BV

RO

TH

INF

LO

EL

EV

CO

NT

ST

OR

ST

OR

RE

LIN

FL

O P

RE

CM

AX

MIN

CW

S

DA

Y C

FS

CF

SC

FS

CF

S

FT

AF

AF

CF

SC

FS

CF

S C

FS

CF

SC

FS

CF

SC

FS

CF

SIN

CH

FF

CF

SC

FS

CF

SC

FS

CF

S

CF

SC

FS

(1)

(2)

(3)

(4)

(5)

(6)

(7)

(8)

(9)

(10

)(1

1)

(12

)(1

3)

(14

)(1

5)

(16

)(1

7)

(18

)(1

9)

(2

0)

(2

1)

(22

)(2

3)

(24

)(2

5)

(26

)

23

10

5

11

10

17

51

32

98

27

3.3

22

39

75

87

04

39

11

45

04

98

97

51

62

63

07

83

24

54

11

00

.24

44

39

21

28

29

41

54

37

27

4.4

02

48

92

91

74

62

11

47

35

80

90

21

73

52

92

13

15

74

00

40

.53

45

41

31

53

41

82

05

91

27

5.8

02

60

92

12

00

60

51

16

16

70

61

20

21

87

63

17

73

36

04

45

80

.74

54

40

41

79

40

81

86

05

27

7.1

12

72

34

11

42

57

61

15

87

72

21

20

82

02

63

38

53

53

74

44

60

.39

47

44

51

45

34

31

55

03

27

8.5

92

85

43

13

09

66

01

16

71

72

41

47

82

12

23

61

23

71

74

55

60

.00

52

34

61

11

19

51

33

19

27

9.5

62

94

12

86

94

38

11

44

95

33

10

85

21

27

36

92

37

74

45

56

0.0

04

63

4

78

91

46

11

24

62

80

.28

30

06

46

52

32

91

13

40

42

47

73

19

29

37

25

28

01

45

07

0.0

05

33

1

87

19

89

17

82

80

.83

30

56

55

01

25

31

12

64

33

66

31

16

35

35

90

37

09

44

34

0.0

05

22

99

61

87

71

55

28

1.2

83

09

76

41

12

07

11

21

82

71

51

41

31

33

31

83

49

84

24

10

.00

50

28

10

53

73

61

32

28

1.6

63

13

26

35

01

76

11

18

72

26

40

91

01

82

74

33

18

14

43

00

.00

48

34

11

49

64

51

18

28

2.0

03

16

39

31

31

58

11

16

91

97

34

38

14

24

47

27

50

34

06

0.0

04

73

6

12

91

11

41

02

15

28

2.4

53

20

56

41

72

10

11

22

13

12

41

28

31

20

50

23

83

30

36

1.1

94

13

6

13

70

94

91

73

28

3.0

13

25

78

52

22

63

11

27

43

62

54

71

06

52

27

12

50

72

96

40

.34

44

41

14

68

92

10

17

02

83

.46

32

99

94

21

21

21

12

23

33

65

44

10

72

22

79

25

99

34

79

0.2

84

93

9

15

61

84

91

54

28

3.9

13

34

22

42

32

13

11

22

42

84

50

31

00

32

24

62

52

53

49

10

.00

51

33

16

55

74

81

37

28

3.3

03

37

90

36

81

86

11

19

72

46

44

99

07

20

36

23

17

32

53

0.0

04

63

5

17

50

67

71

24

28

4.5

83

40

55

26

51

34

11

14

52

12

39

78

12

17

61

20

48

29

26

0.0

05

03

3

18

47

61

61

14

28

4.9

03

43

59

30

41

53

11

16

41

88

34

17

32

14

71

17

49

25

54

0.0

05

03

3

19

42

54

51

01

28

5.1

43

45

88

22

91

15

11

12

61

70

30

26

69

12

31

15

02

21

99

0.0

04

93

1

20

39

49

59

32

85

.36

34

79

72

09

10

51

11

16

15

32

68

60

41

06

11

31

01

92

00

.00

49

32

21

36

46

48

62

85

.56

34

98

71

90

96

11

10

71

40

24

35

36

93

91

15

81

71

90

.01

44

38

22

44

54

51

03

28

5.8

43

52

55

26

81

35

25

16

01

50

24

74

95

87

21

05

91

59

40

.49

52

39

23

55

80

71

42

28

6.1

83

55

80

32

51

64

25

18

92

66

35

37

48

11

59

13

36

17

53

0.6

75

04

2

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APPENDIX C—Scoggins Reservoir Operations Monthly Reports2003 Tualatin River Flow Management Report C-3

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APPENDIX D—Barney Reservoir Operations Monthly ReportsD-2 2003 Tualatin River Flow Management Report

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APPENDIX D—Barney Reservoir Operations Monthly Reports2003 Tualatin River Flow Management Report D-3

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SSSSttttrrrreeeeaaaammmm GGGGaaaauuuuggggeeee RRRReeeeccccoooorrrrddddssss

STREAM GAUGE SITES — LOCATIONS

North


Fanno

Creek

Cr

Cr

Cr

S. Rock

McF

ee C

r

Christensen

Creek

Creek

Cr

Ro

McKay

East

West

Gales

Creek

SCHO SCLO

SCOO

DLLO

Scog

Barney Reservoir

Scoggins Reservoir

DAIRY

ROODRCTV

FRMO

Lake Oswego

WI L L A M

E T T E RI V

ER

TU

AL

R

GALES

Dairy

Creek

Burris Cr

He Cr

Baker Cr

Chicken

Cedar Cr

Canal

(Hagg Lake)

Ash

Hedges

Sain Cr

Ta

gins

Car

pe

Dawson Cr

Brons

Beav

nner Cr

nter

Cr

Fork

Fork

onat

Lake Oswego

AT

IN

VE

RI

CedarMill Cr

S. on Cr

Springbrook Cr

Saum Cr

Butternut Cr

DCBR

on Cr

BCBR

BCSR

CMMB

SPBR

TRTFANO

HCWL

JCDV

MCSCWCJS

WC143

WCHP

BCCH

WSLO

HCTP ASMP

SC121

6900

SCRL

Sylvan Cr

Cr

Cr Sum

mer

Ck

Johns

Ericks

on

CkECMR

BVTS

Wil

wCr

lo

CCER

RCQR

ck

eek

RCWU RCRRCree

k

erto

n

CCSR

TRGC

5400

GASO


Withdrawal Points


TRLF

SCHO

TRMB

APPENDIX E—Stream Gauge Records2003 Tualatin River Flow Management Report E-3

STREAM GAUGE SITES — ALPHABETICAL LISTING BY SITE CODESITE CODE SITE NAME RIVER MILE STATION ID PAGE

5400 East Fork Dairy Creek near Meacham Corner, OR 12.4 14205400 E-12

6900 Fanno Creek at 56th Avenue 11.9 14206900 E-35

ASMP Ash Creek at Metzger Park at Metzger, Oregon 1.25 14206933 E-37

BCBR Bronson Creek at Bronson Road near Orenco, Oregon 2.1 14206423 E-28

BCCH Beaverton Creek at Cedar Hills Blvd at Beaverton, Oregon 7.45 14206360 E-21

BCSR Bronson Creek at Saltzman Road near Orenco, Oregon 5.1 14206419 E-27

BVTS Beaverton Creek at 216th near Orenco, Oregon 1.2 14206435 E-29

CCER Cedar Creek at Edy Road near Sherwood, Oregon 0.62 14206748 E-33

CCSR Chicken Creek at Scholls-Sherwood Road near Sherwood, Oregon 2.3 14206750 E-34

CMMB Cedar Mill Creek at Murray Boulevard near Beaverton, Oregon 1.64 14206395 E-24

DAIRY Dairy Creek at Hwy 8 near Hillsboro, Oregon 2.06 14206200 E-15

DCBR Dawson Creek at Brookwood Road near Hillsboro, Oregon 0.07 14206443 E-30

DLLO Tualatin River at Dilley, Oregon 58.8 14203500 E-9

ECMR Erickson Creek at Menlo Drive at Beaverton, Oregon 0.76 14206365 E-22

FANO Fanno Creek at Durham Road near Tigard, Oregon 1.2 14206950 E-39

FRMO Tualatin River at Farmington, Oregon 33.3 14206500 E-32

GALES Gales Creek at Old Hwy 47 near Forest Grove, Oregon 2.36 14204530 E-10

GASO Tualatin River at Gaston, Oregon 62.3 14202510 E-5

HCTP Hedges Creek at Tualatin Community Park at Tualatin, Oregon 0.3 14206958 E-41

HCWL Hedges Creek Wetland near Tualatin 1.2 14206957 E-40

JCDV Johnson Creek at Davis Road near Beaverton, Oregon 1.3 14206372 E-23

MCSC McKay Creek at Scotch Church Rd near North Plains, Oregon 6.3 14206070 E-13

RCQR Rock Creek at Quatama near Orenco, Oregon 4.9 14206347 E-20

RCRR Rock Creek at Rock Creek Road near Bowers Junction, Oregon 15.8 14206305 E-18

RCTV Rock Creek at Hwy 8 near Hillsboro, Oregon 1.2 14206450 E-31

RCWU Rock Creek at West Union Road near Bethany, Oregon 9.0 14206338 E-19

ROOD Tualatin River at Rood Bridge Road near Hillsboro, Oregon 38.4 14206295 E-17

SC121 Summer Creek at 121st Avenue near Tigard, Oregon 1.0 14206938 E-38

SCHO Sain Creek above Henry Hagg Lake near Gaston, Oregon 1.6 14202920 E-7

SCLO Scoggins Creek above Henry Hagg Lake near Gaston, Oregon 8.0 14202850 E-6

SCOO Scoggins Creek below Henry Hagg Lake near Gaston, Oregon 4.80 14202980 E-8

SCRL Sylvan Creek at Raleighwood Lane near West Slope, Oregon 1.0 14206905 E-36

SPBR Springbrook Creek at Iron Mountain Rd near Lake Oswego, Oregon 0.18 14211116 E-44

TRGC Tualatin River at Golf Course Road near Cornelius, Oregon 51.5 14204800 E-11

TRLF Tualatin River below Lee Falls near Cherry Grove, Oregon 70.7 14202450 E-4

TRMB Tualatin River at Minter Bridge Road near Hillsboro, Oregon 41.6 — E-16

TRT Tualatin River at Tualatin, Oregon 8.9 14206960 E-42

WC143 Willow Creek at 143rd Avenue near Beaverton, Oregon 3.5 14206410 E-25

WCHP Willow Creek at Heritage Parkway near Beaverton, Oregon 0.75 14206413 E-26

WCJS Waible Creek at Jackson School Road near Hillsboro, Oregon 1.0 14206100 E-14

WSLO Tualatin River at West Linn 1.75 14207500 E-43

APPENDIX E—Stream Gauge RecordsE-4 2003 Tualatin River Flow Management Report

TRLF – 14202450 – TUALATIN RIVER AT LEE FALLS NEAR CHERRY GROVE, OREGON [RM 70.7]Latitude: 45 30 21 Longitude: 123 13 06 Source Agency: District 18 Watermaster

Day2003 Daily Mean Discharge in Cubic Feet per Second

JAN FEB MAR APR* MAY* JUN JUL AUG SEP OCT NOV DEC 1 367 934 109 170 36 49 52 66 39 12 128 2 486 546 98 163 39 49 58 66 39 12 109 3 537 400 94 176 52 49 58 66 40 11 135 4 579 314 88 187 55 48 58 66 40 11 121 5 497 258 96 188 59 48 59 65 41 11 182 6 344 217 191 242 57 48 59 65 42 10 356 7 258 187 718 243 56 47 58 68 48 10 253 8 205 162 461 237 52 48 61 67 44 11 185 9 167 144 557 216 45 49 60 75 49 11 148

10 144 131 439 190 45 51 58 71 49 11 13611 137 121 338 172 46 51 58 69 52 26 13012 206 111 411 170 44 51 61 66 71 20 21113 206 102 444 225 44 52 63 62 58 16 41814 190 95 418 191 43 51 71 61 41 16 42715 167 103 439 167 57 42 51 71 57 38 21 31016 145 107 360 148 73 41 53 71 55 50 86 25517 129 267 297 134 64 40 54 70 49 41 174 24818 116 329 262 123 58 44 54 70 41 20 158 20519 106 266 267 113 55 49 53 70 41 25 217 17120 97 246 336 105 52 49 53 70 40 27 146 16021 91 251 601 105 50 49 53 70 40 34 93 15022 123 237 947 95 48 49 53 70 39 27 63 13223 180 199 634 110 46 48 52 69 39 24 50 11924 197 166 463 122 45 47 52 69 39 19 72 18225 215 143 397 120 44 49 52 68 39 16 174 23126 501 128 377 118 42 52 52 68 39 13 215 19227 376 116 350 112 41 50 51 68 39 12 143 17628 264 111 301 104 40 49 50 68 39 11 112 23629 301 — 254 39 48 49 67 39 17 267 21130 575 — 218 37 49 48 67 39 17 179 16531 1,450 — 190 — 37 — 48 67 — 13 — 144

TOTAL 9,356 6,391 11,155 4,446 828 1,428 1,569 2,007 1,607 1,057 2,358 6,226MEAN 302 228 360 159 48.7 47.6 50.6 64.7 53.6 34.1 78.6 201MAX 1,450 934 947 243 73 59 54 71 75 71 267 427MIN 91 95 88 95 37 36 47 52 39 11 10 109AC-FT 18,560 12,680 22,130 8,820 1,640 2,830 3,110 3,980 3,190 2,100 4,680 12,350YEAR 2003* TOTAL=48,428.00 MEAN=139 MAX=1,450 MIN=10 AC-FT=96,060*Incomplete record

TRLF — 14202450 — Tualatin River below Lee Falls [RM 70.7]

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GASO – 14202510 – TUALATIN RIVER AT GASTON, OREGON [RM 62.3]Latitude: 45 26 21 Longitude: 123 07 85 Source Agency: District 18 Watermaster


JAN* FEB MAR* APR MAY JUN JUL AUG SEP OCT NOV DEC 1 578 1,010 198 329 175 52 57 51 74 42 18 215 2 676 795 177 314 160 50 57 60 73 42 17 172 3 799 615 169 331 149 67 55 61 73 43 18 227 4 814 509 157 352 168 67 55 61 73 44 16 201 5 754 444 154 344 191 74 55 63 73 44 16 280 6 563 395 245 414 168 72 54 64 73 45 15 513 7 446 339 760 413 152 71 53 62 77 56 15 420 8 355 287 648 402 141 68 53 66 78 49 15 320 9 284 251 736 374 130 57 54 67 90 56 15 248

10 240 225 651 344 122 57 57 62 87 60 15 232 11 223 205 532 318 116 57 56 61 80 59 23 219 12 358 187 573 321 116 56 55 65 78 83 27 295 13 381 173 638 394 105 56 56 66 72 82 21 520 14 354 159 596 362 98 55 56 76 70 50 19 659 15 303 173 623 329 95 54 54 76 69 47 23 523 16 261 186 545 299 119 51 55 78 62 53 67 416 17 227 436 476 271 112 49 59 77 62 57 307 403 18 201 620 430 245 99 49 57 75 47 30 273 335 19 180 492 434 221 92 60 56 75 46 28 336 281 20 164 433 506 204 86 61 55 75 46 32 278 258 21 151 419 708 203 82 59 55 75 45 37 170 247 22 188 394 1,000 183 77 59 54 76 44 34 109 218 23 273 344 873 203 73 58 53 76 43 29 80 197 24 288 293 698 254 69 57 53 75 43 25 107 300 25 310 257 613 239 68 55 53 73 43 22 231 424 26 601 232 586 237 65 61 52 73 42 19 367 360 27 556 209 549 226 62 59 53 73 42 17 255 341 28 427 196 495 206 59 58 52 74 42 r 174 458 29 435 — 440 203 56 56 50 73 42 16 364 490 30 752 — 394 185 54 55 50 74 43 25 302 383 31 r — 358 — 54 — 50 74 — 19 — 321

TOTAL 12,142 10,278 15,962 8,720 3,313 1,760 1,684 2,157 1,832 1,245 3,693 10,476MEAN 405 367 515 291 107 58.7 54.3 69.6 61.1 41.5 123 338MAX 814 1,010 1,000 414 191 74 59 78 90 83 367 659MIN 151 159 154 183 54 49 50 51 42 16 15 172AC-FT 24,080 20,390 31,660 17,300 6,570 3,490 3,340 4,280 3,630 2,470 7,330 20,780YEAR 2003* TOTAL* =73,262.00 MEAN=202 MAX=1,010 MIN=15 AC-FT=145,300*Incomplete record; r = At least one measurement of flow & stage exceeded rating curve (an estimate of mean daily flow was calculated if possible)

GASO — 14202510 — Tualatin River at Gaston, Oregon [RM 62.3]

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SCLO – 14202850 – SCOGGINS CREEK ABOVE HENRY HAGG LAKE NEAR GASTON, OREGON [RM 8.0]Latitude: 45 30 06 Longitude: 123 15 06 Source Agency: District 18 Watermaster


JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 1 205 495 55.7 84.0 43.8 16.6 8.00 3.10 1.70 2.99 10.0 66.1 2 276 280 51.1 81.3 41.2 15.9 7.89 3.10 1.78 3.10 10.2 58.1 3 301 198 48.0 84.8 40.3 15.3 7.53 3.10 1.70 3.10 10.3 66.2 4 322 154 45.5 86.4 43.1 14.6 7.32 3.32 1.70 3.10 9.99 61.3 5 265 125 44.5 87.1 40.7 13.9 7.05 3.79 1.70 3.30 8.02 86.0 6 187 105 54.6 98.2 37.7 13.0 7.03 4.69 1.70 4.10 5.87 154 7 141 90.9 198 101 36.1 12.6 6.62 4.07 2.58 7.21 5.05 123 8 113 81.9 163 101 34.6 12.4 6.67 4.33 3.10 5.36 4.13 98.5 9 93.6 73.0 230 93.2 33.2 12.5 7.05 4.67 6.32 7.96 3.38 81.7

10 79.9 64.0 193 85.4 31.7 12.7 6.63 4.27 5.92 10.0 5.22 73.9 11 74.6 57.6 154 78.5 30.7 12.4 6.22 3.71 5.00 10.0 8.72 67.4 12 112 53.7 179 77.9 29.6 12.2 6.22 3.69 4.16 17.7 8.52 89.2 13 108 50.0 200 93.6 28.5 12.7 6.04 3.57 3.61 12.4 7.80 16814 104 46.5 197 82.4 26.9 12.2 5.88 3.24 3.31 8.36 7.51 19515 93.5 50.8 207 76.0 26.6 11.9 5.61 2.83 3.10 8.86 9.52 15216 84.1 52.1 176 70.0 31.7 10.9 5.48 3.09 4.08 21.1 37.5 12617 75.9 132 145 64.6 27.6 10.4 5.45 3.09 4.12 15.5 68.1 11518 69.8 166 126 59.2 25.9 10.3 5.09 2.83 3.81 11.1 65.4 99.4 19 64.3 131 122 54.8 24.9 10.5 4.81 2.60 3.66 15.5 82.7 87.0 20 59.3 115 145 51.2 23.7 10.7 4.41 2.59 3.39 15.3 69.2 80.1 21 55.2 105 308 50.0 23.4 10.5 4.41 2.54 3.37 17.0 50.9 72.1 22 71.1 97.1 543 45.8 22.5 10.5 4.13 2.37 3.10 13.8 39.1 62.8 23 91.1 87.2 370 53.7 21.1 10.5 4.03 2.51 3.10 12.6 32.6 56.4 24 104 78.5 253 60.3 20.4 10.2 3.70 2.59 3.09 11.1 37.5 84.5 25 118 71.4 202 57.1 20.4 9.44 3.70 2.52 2.83 10.1 71.0 10626 255 65.7 182 55.3 19.9 8.99 3.70 2.37 2.78 9.23 85.2 93.8 27 209 60.1 161 52.5 18.7 8.29 3.74 2.37 2.59 8.56 69.0 88.1 28 156 56.4 139 49.2 18.0 7.79 3.67 2.34 2.38 8.20 61.4 97.8 29 164 — 120 49.5 17.2 7.51 3.38 2.17 2.51 10.3 97.5 96.1 30 256 — 105 46.6 17.2 7.78 3.10 2.13 2.83 11.5 77.9 81.5 31 706 — 93.1 — 17.2 — 3.10 1.95 — 9.94 — 72.6

TOTAL 5,014.4 3,142.9 5,210.5 2,130.6 874.5 345.20 167.66 95.54 95.02 308.37 1,059.23 2,959.6MEAN 162 112 168 71.0 28.2 11.5 5.41 3.08 3.17 9.95 35.3 95.5MAX 706 495 543 101 43.8 16.6 8.00 4.69 6.32 21.1 97.5 195MIN 55.2 46.5 44.5 45.8 17.2 7.51 3.10 1.95 1.70 2.99 3.38 56.4AC-FT 9,950 6,230 10,340 4,230 1,730 685 333 190 188 612 2,100 5,870YEAR 2003 TOTAL=21,403.52 MEAN=58.6 MAX=706 MIN=1.70 AC-FT=42,450

SCLO — 14202850 — Scoggins Creek above Henry Hagg Lake near Gaston, Oregon [RM 8.0]

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SCHO – 14202920 – SAIN CREEK ABOVE HAGG LAKE NEAR GASTON, OREGON [RM 1.6]

Latitude: 45 28 50 Longitude: 123 14 40 Source Agency: District 18 Watermaster


JAN FEB* MAR* APR MAY JUN JUL AUG SEP OCT* NOV DEC 1 98.9 206 47.9 22.9 8.03 2.37 .50 .82 1.33 3.35 21.2 2 119 125 45.8 22.0 7.42 2.23 .57 .81 1.33 3.68 19.2 3 129 95.3 49.2 21.3 6.91 2.00 .60 .72 1.41 3.71 24.4 4 148 77.8 52.6 23.4 6.44 1.90 .67 .70 1.46 3.55 23.2 5 123 67.0 51.1 22.7 5.88 1.85 .81 .69 1.71 3.01 38.3 6 94.5 57.0 59.0 21.0 5.45 1.87 1.14 .74 2.37 2.21 66.7 7 75.0 50.1 57.3 20.2 5.11 1.60 .76 1.53 4.28 2.31 49.1 8 62.3 44.9 53.1 19.2 5.05 1.83 1.08 1.86 2.52 2.38 38.1 9 52.1 40.7 48.0 18.5 5.33 1.94 1.06 3.56 4.22 2.49 31.3

10 45.5 37.1 43.8 17.6 5.42 1.24 .76 2.50 3.85 2.58 30.4 11 43.6 41.1 17.2 5.16 1.13 .65 2.16 4.61 3.96 28.6 12 62.8 40.3 16.5 5.09 1.07 .65 1.84 7.64 3.29 39.3 13 61.7 48.3 15.5 5.25 1.17 .62 1.43 4.62 2.97 78.9 14 57.5 41.5 15.0 4.95 1.17 .53 1.21 3.12 2.74 85.0 15 51.0 38.7 14.8 4.59 1.09 .47 1.21 3.76 4.04 65.8 16 45.9 36.1 18.5 3.99 1.06 .69 1.98 7.76 15.6 55.2 17 41.5 33.5 15.5 3.60 .92 .63 1.94 4.95 20.5 51.2 18 37.5 31.4 14.7 3.99 .71 .71 1.59 19.5 43.2 19 34.1 29.2 13.7 4.60 .62 .96 1.46 23.0 37.1 20 31.7 27.3 13.2 4.37 .55 .92 1.36 21.2 34.1 21 30.0 26.9 12.7 4.37 .55 .84 1.19 15.3 30.4 22 38.3 25.7 12.3 3.96 .44 .92 1.08 11.0 27.4 23 44.7 28.9 11.6 4.30 .35 1.14 .99 9.07 25.2 24 47.0 31.0 10.9 3.67 .49 .98 1.16 12.7 46.2 25 49.2 28.8 10.7 3.20 .66 .83 1.19 29.0 58.1 26 94.2 28.2 10.6 2.86 .61 .81 1.09 33.8 49.3 27 81.1 27.0 10.1 2.45 .57 .91 1.02 24.3 46.4 28 64.7 73.1 25.5 9.66 2.15 .49 1.00 .78 19.7 58.8 29 75.2 — 65.7 25.3 9.15 1.91 .67 .84 .99 3.78 34.3 59.3 30 129 — 58.4 24.4 8.90 2.33 .56 .72 1.41 4.12 25.2 48.3 31 305 — 52.1 — 8.49 — .49 .67 — 3.40 — 42.0

TOTAL 2,373.0 800.9 249.3 1,146.9 478.50 137.83 34.20 24.44 41.01 72.24 360.44 1,351.7MEAN 76.5 80.1 62.3 38.2 15.4 4.59 1.10 .79 1.37 3.61 12.0 43.6MAX 305 206 73.1 59.0 23.4 8.03 2.37 1.14 3.56 7.76 34.3 85.0MIN 30.0 37.1 52.1 24.4 8.49 1.91 .35 .47 .69 1.33 2.21 19.2AC-FT 4,710 1,590 494 2,270 949 273 68 48 81 143 715 2,680YEAR 2003* TOTAL=7,070.46 MEAN=22.9 MAX=305 MIN=.35 AC-FT=14,020*Incomplete record

SCHO — 14202920 — Sain Creek above Hagg Lake near Gaston, Oregon [RM 1.6]

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UNITED STATES DEPARTMENT OF THE INTERIOR – GEOLOGICAL SURVEY – OREGON DISTRICTSTATION NUMBER: 14202980 SCOGGINS CREEK BL HENRY HAGG LK NR GASTON,OREG.

LATITUDE: 452810 LONGITUDE: 1231156 DRAINAGE AREA: 38.80 DATUM: 87.48

Discharge, Cubic Feet per Second, Calendar Year January to December 2003 Daily Mean ValuesDay JAN FEB MAR APR MAY JUN JUL AUG SEP OCT† NOV† DEC†

1 9.0 13 9.9 203 66 30 119 206 161 180 135 152 9.4 13 10 203 80 47 128 198 161 179 135 113 9.2 13 10 174 81 83 141 198 161 162 121 114 9.7 419 10 151 82 97 141 198 160 147 105 115 9.2 759 10 151 88 100 141 204 162 146 100 116 9.2 566 169 152 101 104 141 207 162 142 96 117 9.2 177 395 152 101 110 143 191 162 128 96 118 9.2 105 411 129 101 113 149 185 154 115 96 119 9.2 105 201 96 94 106 148 189 132 98 96 11

10 9.2 104 193 126 87 100 157 188 120 79 95 1111 9.4 105 526 127 87 100 163 185 104 60 94 9.912 9.9 104 609 131 68 109 160 180 88 60 91 1013 11 104 217 131 54 115 159 178 83 65 93 1114 13 104 249 131 54 115 159 172 83 72 93 1115 13 104 199 131 55 115 151 168 98 68 90 1016 13 104 199 131 55 115 149 166 111 64 91 1017 13 106 171 131 55 121 162 165 115 71 52 1018 13 106 151 119 55 125 169 163 121 81 24 1019 14 90 185 101 55 108 169 162 121 81 24 1020 14 79 331 101 55 100 169 167 122 78 24 1021 22 63 324 102 54 100 168 168 133 76 24 1022 32 52 124 86 64 100 174 173 141 98 24 1023 32 52 281 71 69 100 172 177 154 117 24 1024 42 32 891 92 64 100 169 177 164 117 24 1125 59 13 1000 105 64 107 176 177 174 116 23 1126 59 10 613 106 63 133 182 169 177 116 23 1127 150 9.9 339 106 42 153 182 161 176 116 23 1128 322 10 273 107 31 152 181 164 176 128 23 1129 287 —- 185 78 30 152 195 167 169 136 23 1130 13 —- 131 45 30 141 210 164 171 136 23 1131 14 —- 156 —- 30 —- 209 162 —- 135 —- 11

TOTAL 1247.8 3521.9 8572.9 3669 2015 3251 5036 5529 4216 3367 1985 333.9MEAN 40.3 126 277 122 65.0 108 162 178 141 109 66.2 10.8MAX 322 759 1000 203 101 153 210 207 177 180 135 15MIN 9.0 9.9 9.9 45 30 30 119 161 83 60 23 9.9AC-FT 2480 6990 17000 7280 4000 6450 9990 10970 8360 6680 3940 662YEAR 2003 TOTAL=42744.5 MEAN=117 MAX=1000 MIN=9.0 AC-FT=84780

† Provisional data–subject to revision

SCOO — 14202980 — Scoggins Creek below Henry Hagg Lake near Gaston, Oregon [RM 4.8]

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UNITED STATES DEPARTMENT OF THE INTERIOR – GEOLOGICAL SURVEY – OREGON DISTRICTSTATION NUMBER: 14203500 TUALATIN RIVER NEAR DILLEY, OREG.



1 970 2870 246 584 264 85 166 239 211 210 180 1982 915 1940 222 562 264 87 164 240 210 211 180 1553 1240 1240 210 546 249 134 182 242 213 207 175 1844 1360 980 195 530 253 151 183 242 210 182 150 1735 1470 1450 183 519 266 161 184 248 214 182 150 2206 1040 1380 309 540 261 162 183 256 213 180 139 3947 755 858 711 563 248 167 180 242 218 183 137 4118 610 593 1290 564 237 169 185 230 214 165 131 3409 487 495 1370 510 222 159 186 239 204 160 131 263

10 391 427 1240 497 203 148 193 235 189 148 129 24311 333 382 1220 468 195 148 204 231 175 124 132 23012 447 349 1500 471 187 152 198 224 157 139 139 27113 537 324 1300 537 160 162 199 223 166 145 134 40614 536 302 1140 577 153 162 200 225 164 129 135 69815 493 306 1030 559 148 162 192 222 163 122 130 75016 439 335 935 527 159 158 182 221 162 118 155 58617 385 488 799 488 160 158 201 220 163 135 285 48918 336 860 690 442 150 166 208 218 159 122 222 40219 296 837 650 382 144 161 206 213 155 115 247 32820 264 709 734 354 140 152 206 217 155 121 259 28421 240 636 1030 344 136 151 205 222 163 120 182 26522 271 573 1730 315 136 151 206 223 166 131 133 23323 354 521 1950 297 142 150 208 233 181 160 108 20724 375 437 1970 364 134 148 204 233 191 155 114 28425 425 352 2060 379 132 149 208 230 203 151 171 45626 561 305 1830 375 130 169 216 225 206 149 294 44127 725 272 1330 364 119 196 218 212 205 148 234 40828 775 249 1020 347 96 196 216 213 205 154 172 51829 824 — 809 328 92 194 219 220 202 179 265 65930 891 — 659 272 89 188 239 214 198 186 272 62431 2090 — 592 — 88 — 240 212 — 180 — 500

TOTAL 20835 20470 30954 13605 5357 4696 6181 7064 5635 4811 5285 11620 MEAN 672 731 999 454 173 157 199 228 188 155 176 375 MAX 2090 2870 2060 584 266 196 240 256 218 211 294 750 MIN 240 249 183 272 88 85 164 212 155 115 108 155 AC-FT 41330 40600 61400 26990 10630 9310 12260 14010 11180 9540 10480 23050YEAR 2003 TOTAL=136513 MEAN=374 MAX=2870 MIN=85 AC-FT=270800


DLLO — 14203500 — Tualatin River near Dilley, Oregon [RM 58.8]

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GALES – 14204530 – GALES CREEK AT OLD HWY 47 NEAR FOREST GROVE, OREGON [RM 2.36]Latitude: 45 30 39 Longitude: 123 06 56 Source Agency: District 18 Watermaster


JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 1 684 2,870 226 333 182 64.4 23.8 11.2 5.23 13.2 28.6 190 2 865 1,240 211 314 173 60.8 24.3 11.1 4.78 12.6 29.9 168 3 996 820 202 341 168 56.2 23.2 12.6 3.81 14.1 32.4 191 4 1,010 633 191 340 171 48.9 23.3 12.5 3.60 14.3 36.8 184 5 998 518 186 320 171 45.4 22.2 13.1 5.02 14.7 36.3 236 6 749 444 202 348 159 45.4 22.3 17.7 5.19 15.3 33.0 413 7 556 382 465 345 153 43.0 21.8 16.0 7.83 20.3 31.9 364 8 431 334 490 336 151 39.9 21.3 15.0 12.3 20.2 31.9 304 9 348 300 694 315 145 40.2 21.9 16.0 15.7 21.1 31.0 256

10 295 276 726 295 138 42.7 20.9 15.1 19.3 26.4 31.3 238 11 266 256 596 276 133 41.2 19.5 14.0 17.9 22.7 36.3 218 12 385 239 605 287 128 40.3 19.8 15.4 15.9 44.9 49.6 250 13 375 223 788 344 124 41.0 21.1 14.4 14.8 43.5 30.4 409 14 356 209 742 316 118 39.1 19.7 13.4 14.6 23.8 26.5 657 15 319 219 737 294 116 37.3 19.7 11.7 14.1 21.8 27.9 558 16 289 228 648 274 131 33.8 19.9 13.7 14.2 30.7 64.6 437 17 264 464 545 257 122 31.1 18.3 13.0 15.0 34.9 193 402 18 242 730 468 240 115 30.6 17.2 12.4 14.6 26.9 183 339 19 223 544 450 223 108 31.8 17.1 9.31 14.4 27.5 218 294 20 207 450 514 212 104 32.2 15.4 10.8 13.4 32.5 226 270 21 194 393 753 212 101 32.2 15.0 7.80 13.7 60.0 182 242 22 229 363 1,930 196 95.4 32.5 13.0 9.62 12.4 52.0 139 216 23 329 326 1,570 205 89.5 32.1 12.5 9.26 9.44 38.8 114 200 24 356 299 977 232 85.9 31.0 13.1 10.8 10.5 31.2 121 279 25 391 277 829 221 83.7 27.8 13.1 9.82 10.5 27.0 187 395 26 773 260 730 216 81.4 27.1 15.0 9.21 8.59 24.8 251 357 27 831 247 626 208 76.4 26.0 15.7 8.80 9.12 23.2 210 345 28 611 231 539 196 73.5 24.6 12.4 9.17 9.68 22.3 174 417 29 542 — 466 200 69.6 24.2 10.9 8.74 11.9 23.8 233 446 30 776 — 410 189 67.5 24.2 8.71 8.26 12.2 38.9 212 378 31 2,200 — 367 — 67.3 — 9.32 8.48 — 32.6 — 326

TOTAL 17,090 13,775 18,883 8,085 3,701.2 1,127.0 551.43 368.37 339.69 856.0 3,201.4 9,979MEAN 551 492 609 270 119 37.6 17.8 11.9 11.3 27.6 107 322MAX 2,200 2,870 1,930 348 182 64.4 24.3 17.7 19.3 60.0 251 657MIN 194 209 186 189 67.3 24.2 8.71 7.80 3.60 12.6 26.5 168AC-FT 33,900 27,320 37,450 16,040 7,340 2,240 1,090 731 674 1,700 6,350 19,790YEAR 2003 TOTAL=77,957.09 MEAN=214 MAX=2,870 MIN=3.60 AC-FT=154,600

GALES — 14204530 — Gales Creek at Old Hwy 47 near Forest Grove, Oregon [RM 2.36]

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TRGC – 14204800 – TUALATIN RIVER AT GOLF COURSE ROAD NEAR CORNELIUS, OREGON [RM 51.5]



JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 1 1,640 2,570 507 1,080 448 65.2 74.3 83.9 112 138 139 445 2 1,750 2,560 463 977 432 56.0 45.1 94.8 103 145 153 349 3 1,900 2,300 429 949 408 61.1 60.7 129 83.5 153 188 384 4 2,040 2,040 389 933 398 79.7 63.6 123 87.7 126 134 397 5 2,130 1,820 363 888 424 80.6 75.7 125 92.8 134 111 473 6 2,100 1,760 419 901 404 81.6 78.9 138 97.3 130 108 755 7 1,880 1,650 867 934 374 74.6 68.3 129 132 147 93.1 842 8 1,580 1,390 1,260 935 365 100 56.3 118 157 141 98.1 772 9 1,260 1,080 1,510 889 338 95.0 57.1 155 162 124 99.0 650

10 987 883 1,750 836 311 81.7 58.8 161 161 124 98.1 576 11 798 751 1,740 798 298 75.8 70.2 149 146 86.7 91.3 535 12 907 674 1,710 798 281 70.9 73.9 127 109 108 114 549 13 1,070 630 1,840 904 242 92.9 86.9 108 107 159 112 742 14 1,060 566 1,870 964 216 108 87.2 112 108 115 116 1,140 15 986 556 1,830 934 216 102 68.5 101 103 86.3 109 1,250 16 888 633 1,750 872 224 85.2 61.6 115 106 87.0 139 1,160 17 793 819 1,630 814 253 65.5 68.0 133 107 120 395 1,030 18 712 1,380 1,470 749 211 72.6 75.6 117 108 103 406 883 19 646 1,510 1,310 684 196 85.1 72.4 91.5 89.9 84.5 413 758 20 574 1,460 1,270 633 175 78.1 76.2 101 81.9 104 551 674 21 510 1,310 1,370 603 170 78.1 72.0 103 90.9 99.9 408 620 22 536 1,150 1,830 568 152 102 54.8 101 91.0 124 270 540 23 759 1,000 2,260 515 155 93.5 66.4 130 98.9 148 188 475 24 806 863 2,300 638 144 68.7 65.1 145 103 148 165 563 25 891 736 2,230 654 145 53.5 59.0 133 107 130 257 838 26 1,110 657 2,200 642 131 45.2 75.7 117 116 118 567 882 27 1,420 588 2,080 625 121 70.6 89.8 111 115 139 515 829 28 1,480 523 1,880 582 77.1 74.8 83.2 96.9 122 131 380 947 29 1,460 — 1,660 560 77.6 74.4 54.8 108 128 164 454 1,100 30 1,560 — 1,450 494 60.0 93.1 69.2 113 120 184 565 1,120 31 1,930 — 1,240 — 66.5 — 79.7 112 — 178 — 989

TOTAL 38,163 33,859 44,877 23,353 7,513.2 2,365.5 2,149.0 3,681.1 3,345.9 3,979.4 7,436.6 23,267MEAN 1,231 1,209 1,448 778 242 78.9 69.3 119 112 128 248 751MAX 2,130 2,570 2,300 1,080 448 108 89.8 161 162 184 567 1,250MIN 510 523 363 494 60.0 45.2 45.1 83.9 81.9 84.5 91.3 349AC-FT 75,700 67,160 89,010 46,320 14,900 4,690 4,260 7,300 6,640 7,890 14,750 46,150YEAR 2003 TOTAL=193,989.70 MEAN=531 MAX=2,570 MIN=45.1 AC-FT=384,800

TRGC — 14204800 — Tualatin River at Golf Course Road near Cornelius, Oregon [RM 51.5]

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UNITED STATES DEPARTMENT OF THE INTERIOR – GEOLOGICAL SURVEY – OREGON DISTRICT STATION NUMBER: 14205400 EAST FORK DAIRY CREEK NEAR MEACHAM CORNER, OR

LATITUDE: 454051 LONGITUDE: 1230412 DRAINAGE AREA: 32.92 DATUM: 290


1 222 1010 89 151 86 38 23 14 10 8.9 10 302 242 608 83 146 82 37 22 14 10 8.9 10 283 303 403 79 152 87 36 21 14 9.9 8.9 10 374 369 283 75 137 95 35 21 14 9.8 8.9 10 335 315 228 73 130 86 34 21 15 9.7 9.1 10 486 223 187 75 137 82 33 21 15 9.7 9.6 10 707 159 158 140 133 81 32 20 14 11 12 10 638 122 138 139 132 78 32 21 15 11 10 10 549 99 121 281 128 73 32 20 14 15 11 10 49

10 83 109 304 123 70 32 19 14 13 11 10 4811 77 99 249 116 67 31 19 14 12 14 12 4312 106 91 238 137 65 31 19 13 11 24 11 5613 94 85 225 187 62 31 19 13 10 13 11 10114 96 79 214 175 60 30 19 13 10 11 10 14215 91 96 222 164 59 29 18 13 10 12 12 11916 85 106 201 148 60 28 18 13 10 13 22 10317 78 239 180 136 57 27 18 13 10 11 28 8818 71 335 162 121 55 27 17 12 10 10 25 7619 65 276 163 110 52 28 17 12 10 13 44 6920 61 224 169 103 50 27 17 12 9.9 12 34 6821 57 191 264 102 49 27 16 12 9.8 12 26 6122 69 166 593 92 48 27 16 12 9.2 11 20 5523 69 146 516 105 46 26 16 12 9.1 11 18 5324 75 132 385 107 46 26 16 12 9.2 11 24 7425 86 120 317 98 45 24 16 11 8.9 9.9 46 8826 222 111 283 98 44 24 15 11 8.7 9.7 46 8327 241 102 241 94 43 23 15 11 8.6 9.7 37 9328 183 95 217 92 41 22 15 11 8.7 9.6 32 9929 167 — 193 95 40 22 15 11 8.8 11 36 9830 237 — 174 90 40 23 14 11 9.2 11 30 8431 1140 — 161 — 39 — 14 10 — 10 — 77

TOTAL 5507 5938 6705 3739 1888 874 558 395 302.2 347.2 624 2190MEAN 178 212 216 125 60.9 29.1 18.0 12.7 10.1 11.2 20.8 70.6MAX 1140 1010 593 187 95 38 23 15 15 24 46 142MIN 57 79 73 90 39 22 14 10 8.6 8.9 10 28AC-FT 10920 11780 13300 7420 3740 1730 1110 783 599 689 1240 4340YEAR 2003 TOTAL=29067.4 MEAN=79.6 MAX=1140 MIN=8.6 AC-FT=57660


5400 — 14205400 — East Fork Dairy Creek near Meacham Corner, Oregon

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MCSC – 14206070 – MCKAY CREEK AT SCOTCH CHURCH RD NEAR NORTH PLAINS, OREGON [RM 6.3]Latitude: 45 57 21 Longitude: 122 99 18 Source Agency: District 18 Watermaster


JAN* FEB* MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 1 358 r 73.4 97.3 84.2 17.1 5.45 .98 1.02 5.90 17.2 43.9 2 278 r 65.2 89.1 76.2 15.6 5.83 .77 .58 6.56 17.7 41.0 3 323 r 391 63.1 96.5 69.9 13.9 4.95 .99 1.23 5.57 19.1 48.7 4 348 268 59.6 113 69.2 13.5 5.34 .96 1.02 5.54 19.5 51.9 5 354 194 59.3 114 65.6 12.8 5.05 1.93 .80 6.48 19.1 64.7 6 273 150 59.3 127 58.7 11.6 5.35 2.39 .73 7.21 19.3 97.0 7 192 120 131 132 54.2 11.1 5.60 3.64 1.16 9.21 19.5 92.3 8 140 103 204 143 54.6 10.7 5.80 3.71 1.57 11.9 20.6 91.6 9 110 88.4 273 136 50.1 10.2 4.58 5.08 7.44 11.8 22.0 75.3

10 89.9 79.3 328 120 44.3 14.6 4.75 5.24 11.5 16.3 22.9 67.5 11 76.8 71.6 280 113 42.6 10.1 4.30 4.63 7.97 14.1 23.5 70.8 12 137 66.0 225 175 41.0 9.34 4.02 4.22 7.19 16.8 23.0 71.5 13 200 62.7 220 352 38.6 9.71 3.90 3.50 6.89 20.0 20.8 12614 197 55.3 205 354 36.5 10.7 3.85 1.67 6.37 13.3 19.7 28815 170 56.4 189 267 34.5 9.68 4.52 1.47 5.56 11.3 20.4 25416 140 84.2 166 194 33.8 9.35 3.63 2.40 5.61 12.9 24.1 17717 116 173 143 159 32.6 8.23 3.39 3.01 6.26 14.7 35.1 13318 98.7 r 424 124 131 30.1 8.44 3.24 2.57 6.67 12.0 30.2 10119 85.0 r 391 116 104 28.4 8.36 2.48 2.41 6.05 11.2 36.4 82.4 20 74.3 288 124 91.8 27.1 8.66 2.79 1.60 5.62 15.6 55.0 72.4 21 67.1 215 135 87.2 26.3 8.75 3.42 2.50 5.33 13.9 41.4 69.5 22 73.6 177 273 79.3 25.6 8.51 2.76 2.34 5.32 12.2 32.0 60.8 23 124 148 350 73.6 24.8 8.56 2.36 1.70 5.15 11.2 26.0 55.3 24 130 126 306 122 23.7 8.03 2.13 3.06 5.44 10.8 24.7 74.5 25 143 109 231 113 23.1 7.81 2.08 2.25 5.69 11.0 32.4 12626 207 95.8 204 117 21.8 6.98 2.52 1.33 5.50 10.4 52.7 12627 281 87.0 176 116 20.4 6.85 2.27 1.43 5.60 9.86 43.6 12428 246 75.7 153 107 19.2 6.46 2.45 1.66 5.50 9.78 35.6 22129 202 — 132 101 18.2 5.61 1.79 .62 4.64 10.9 46.8 25230 327 — 116 93.4 17.5 5.43 1.82 1.50 3.08 13.7 50.8 19031 r — 106 — 19.1 — 1.08 1.59 — 17.9 — 146

TOTAL 5,561.4 4,099.4 5,289.9 4,118.2 1,211.9 296.66 113.50 73.15 142.49 360.01 871.1 3,495.1MEAN 185 158 171 137 39.1 9.89 3.66 2.36 4.75 11.6 29.0 113MAX 358 424 350 354 84.2 17.1 5.83 5.24 11.5 20.0 55.0 288MIN 67.1 55.3 59.3 73.6 17.5 5.43 1.08 .62 .58 5.54 17.2 41.0AC-FT 11,030 8,130 10,490 8,170 2,400 588 225 145 283 714 1,730 6,930YEAR 2003* TOTAL=25,632.81 MEAN=70.8 MAX=424 MIN=.58 AC-FT=50,840*Incomplete record; r = At least one measurement of flow & stage exceeded rating curve (an estimate of mean daily flow was calculated if possible)

MCSC — 14206070 — McKay Creek at Scotch Church Road near Hillsboro, Oregon [RM 6.3]

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WCJS – 14206100 – WAIBLE CREEK AT JACKSON SCHOOL RD NEAR HILLSBORO, OREGON [RM 1.0]Latitude: 45 33 55 Longitude: 122 58 12 Source Agency: District 18 Watermaster


JAN* FEB MAR APR MAY* JUN JUL* AUG* SEP* OCT* NOV DEC 1 61.5 r 129 9.71 12.5 29.3 1.64 .35 r r r .03 5.51 2 66.6 73.1 8.17 10.8 18.5 1.59 .28 r r r .02 4.21 3 80.8 57.1 9.09 16.2 13.3 1.60 .21 r r r .02 11.5 4 88.6 46.6 7.38 21.3 12.3 1.51 .16 r r r .04 6.17 5 63.9 38.7 6.96 17.4 8.12 1.18 .11 r r r .03 26.4 6 46.7 30.9 7.12 19.1 6.58 1.06 .08 r r r .02 27.5 7 36.2 25.4 62.3 19.1 5.23 .95 .06 r r r .02 18.1 8 28.9 21.1 58.8 20.7 4.89 .80 .04 r r r .02 14.2 9 23.2 17.3 88.8 15.9 3.70 .89 .03 r r r .05 9.53

10 18.6 14.8 56.3 14.5 2.91 .85 r .01 r r r .06 12.511 17.0 12.9 40.9 14.1 2.72 .78 r r r r .09 13.912 66.7 10.6 47.8 66.6 2.41 .74 r r r .29 .09 13.813 73.5 9.36 55.1 r 131 2.09 .96 r r r .52 .10 57.114 64.3 7.62 51.6 62.7 1.16 1.23 r r r .33 .10 96.215 44.7 14.7 46.0 42.1 .04 1.20 r r r 12.5 .11 52.716 34.9 37.4 36.5 31.0 r 1.13 r r r 9.39 .96 36.217 28.2 r 94.7 30.0 36.2 r 1.14 r r r 7.75 2.69 29.418 22.8 106 28.4 23.6 r 1.12 r r r .75 1.28 21.919 18.6 64.7 29.4 17.6 r 1.14 r r r .72 11.7 17.020 15.9 50.4 34.3 14.1 r 1.17 r r r .84 6.01 15.621 13.8 40.9 54.6 15.5 r 1.12 r r r 3.35 2.18 22.022 28.5 33.7 92.8 11.2 .83 1.08 r r r 1.58 1.35 16.523 37.7 27.4 57.6 23.7 .86 1.32 r r r .46 1.06 13.724 42.1 20.5 43.1 58.0 .80 1.26 r r r .29 1.35 36.725 38.0 16.3 34.2 36.4 .87 1.06 r r r .17 6.12 64.326 62.2 13.9 41.2 36.8 .92 .85 r r r .08 4.75 38.427 48.6 10.9 31.4 26.5 1.07 .70 r r r .05 2.39 47.328 37.3 9.75 25.2 19.8 1.15 .68 r r r .04 1.85 71.529 55.3 — 19.9 16.4 1.21 .55 r r r .03 12.4 83.630 121 — 16.3 39.6 1.62 .43 r r r .05 5.86 49.731 r — 13.7 — 1.97 — r r — .06 — 42.5

TOTAL 1,386.1 1,035.73 1,144.63 890.4 124.55 31.73 1.33 39.25 62.75 975.62MEAN 46.2 37.0 36.9 29.7 4.98 1.06 .13 1.96 2.09 31.5MAX 121 129 92.8 131 29.3 1.64 .35 12.5 12.4 96.2MIN 13.8 7.62 6.96 10.8 .04 .43 .01 .03 .02 4.21AC-FT 2,750 2,050 2,270 1,770 247 63 2.6 78 124 1,940YEAR 2003* TOTAL=5,692.09 MEAN=21.5 MAX=131 MIN=.01 AC-FT=11,290

*Incomplete record; r = At least one measurement of flow & stage exceeded rating curve (an estimate of mean daily flow was calculated if possible)

WCJS — 14206100 — Waible Creek at Jackson School Road near Hillsboro, Oregon [RM 1.0]

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DAIRY – 14206200 – DAIRY CREEK AT HWY 8 NEAR HILLSBORO, OREGON [RM 2.06]Latitude: 45 30 38 Longitude: 123 06 56 Source Agency: District 18 Watermaster


JAN* FEB* MAR* APR MAY JUN JUL AUG SEP OCT NOV DEC* 1 r r 495 r 489 104 45.2 12.5 19.2 28.5 51.6 166 2 r r 446 r 424 97.4 41.7 10.6 17.3 31.0 53.7 145 3 r r 402 r 381 91.5 39.9 11.4 13.8 35.0 53.6 158 4 r r 370 r 368 92.0 39.7 16.3 12.4 36.6 53.6 189 5 r r 343 r 370 86.5 41.3 14.4 12.7 41.3 52.9 242 6 r r 331 r 332 83.4 41.3 22.7 10.3 44.8 52.3 409 7 r r r r 301 81.8 44.2 28.0 10.7 51.6 53.5 526 8 r r r r 292 75.8 41.9 26.8 16.1 54.7 53.0 480 9 r r r r 276 74.3 39.8 32.2 36.1 59.2 53.6 378

10 r r r r 245 76.4 37.3 34.5 47.8 64.4 56.1 307 11 r r r r 226 76.7 34.0 34.2 46.3 62.3 54.0 302 12 r r r r 215 74.0 31.4 29.1 40.3 60.7 55.6 289 13 r r r r 201 71.7 32.1 27.7 34.7 83.0 59.514 r 504 r r 187 73.6 33.1 24.4 33.2 69.2 56.215 r 455 r r 170 72.4 32.3 16.5 30.9 55.7 56.016 r r r r 171 70.1 30.7 16.6 34.5 58.7 65.817 r r r r 174 65.9 28.4 17.2 35.5 62.7 93.218 r r r r 165 59.9 25.2 19.5 35.5 58.2 11619 r r r r 157 59.2 27.8 17.7 34.7 63.1 12820 535 r r 581 145 59.8 25.3 18.8 34.4 61.6 18221 467 r r 531 139 61.5 23.8 14.8 31.3 58.9 16022 450 r r 502 135 61.8 20.9 11.6 30.2 59.4 11923 r r r 449 132 61.5 20.2 12.2 28.6 52.0 94.324 r r r r 125 59.8 19.0 12.7 26.1 46.6 86.025 r r r r 122 56.1 19.4 13.5 25.7 43.3 10426 r r r r 120 52.6 16.0 16.5 24.1 44.9 17327 r r r 606 115 49.2 15.0 13.5 22.4 41.6 19328 r 551 r 559 112 39.9 14.0 13.6 24.9 37.4 14629 r — r 521 107 43.4 11.8 15.7 24.4 39.8 16630 r — r 539 106 41.5 10.5 13.8 25.2 42.3 20331 r — r — 107 — 12.1 15.6 — 47.5 —

TOTAL 1,452 1,510 2,387 4,288 6,609 2,073.7 895.3 584.6 819.3 1,596.0 2,844.5 3,591MEAN 484 503 398 536 213 69.1 28.9 18.9 27.3 51.5 94.8 299MAX 535 551 495 606 489 104 45.2 34.5 47.8 83.0 203 526MIN 450 455 331 449 106 39.9 10.5 10.6 10.3 28.5 51.6 145AC-FT 2,880 3,000 4,730 8,510 13,110 4,110 1,780 1,160 1,630 3,170 5,640 7,120YEAR 2003* TOTAL=35,917.14 MEAN=131 MAX=801 MIN=6.43 AC-FT=71,240*Incomplete record; r = At least one measurement of flow & stage exceeded rating curve (an estimate of mean daily flow was calculated if possible)

DAIRY — 14206200 — Dairy Creek at Hwy 8 near Hillsboro, Oregon [RM 2.06]

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TRMB – TUALATIN RIVER AT MINTER BRIDGE ROAD NEAR HILLSBORO, OREGON [RM 41.64]Latitude: Longitude: Source Agency: District 18 Watermaster


JAN* FEB* MAR* APR* MAY* JUN* JUL AUG SEP* OCT NOV DEC 1 116 89.3 114 121 157 556 2 93.4 88.2 111 130 138 457 3 85.9 106 98.9 136 153 445 4 157 92.9 126 93.8 133 157 502 5 154 102 108 96.5 125 133 588 6 156 107 133 97.8 130 122 910 7 146 109 131 112 135 116 1,170 8 147 94.9 120 136 147 112 1,110 9 162 89.4 142 145 138 113 918

10 151 88.2 146 167 159 115 77411 145 88.8 150 144 113 73912 137 93.4 132 126 113 70513 143 98.8 116 176 129 93014 163 105 113 175 124 1,92015 165 96.0 107 134 123 2,39016 158 85.4 105 125 127 2,28017 128 83.7 119 136 235 2,01018 115 85.8 121 142 422 1,65019 124 90.4 107 109 130 424 1,28020 127 89.4 98.3 100 131 622 1,03021 124 91.9 107 96.5 134 546 94422 132 81.5 101 105 141 381 84423 145 79.7 111 101 142 269 72224 127 81.7 123 106 149 212 75525 110 79.3 129 108 140 247 1,31026 92.7 81.7 116 113 130 481 1,61027 95.1 89.8 113 114 125 594 1,50028 104 97.1 106 115 130 475 1,74029 — 101 81.1 104 120 134 477 2,18030 — 110 78.9 112 120 148 650 2,38031 — — — 82.1 112 — 160 — 2,210

TOTAL 3,618.8 2,820.2 3,591.8 2,479.5 4,306 8,080 38,559MEAN 134 91.0 116 113 139 269 1,244MAX 165 116 150 167 176 650 2,390MIN 92.7 78.9 88.2 93.8 121 112 445AC-FT 7,180 5,590 7,120 4,920 8,540 16,030 76,480YEAR 2003* TOTAL=63,455.30 MEAN=313 MAX=2,390 MIN=78.9 AC-FT=125,900*Incomplete record

TRMB — Tualatin River at Minter Bridge Road near Hillsboro, Oregon [RM 41.6]

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ROOD – 14206295 – TUALATIN RIVER AT ROOD BRIDGE ROAD NEAR HILLSBORO, OREGON [RM 38.44]Latitude: 45 29 24 Longitude: 122 57 06 Source Agency: District 18 Watermaster


JAN FEB MAR APR MAY* JUN* JUL* AUG* SEP* OCT* NOV* DEC* 1 3,570 6,100 1,070 3,130 1,420 2 3,490 7,010 981 2,690 1,060 3 3,820 7,060 901 2,260 905 4 4,100 6,680 828 2,090 871 5 4,350 6,170 754 1,930 857 6 4,440 5,640 728 1,810 788 7 4,450 5,130 1,270 1,820 723 8 4,250 4,570 2,410 1,850 690 9 3,890 3,960 2,870 1,800 659

10 3,410 3,300 3,230 1,660 59511 2,800 2,580 3,300 1,550 54412 2,440 1,840 3,380 1,760 51213 2,680 1,360 3,560 2,580 47514 2,750 1,130 3,700 3,080 42915 2,600 1,020 3,750 2,810 39116 2,310 1,220 3,710 2,490 38617 1,970 1,690 3,600 2,200 41818 1,630 3,040 3,430 1,910 40619 1,370 3,470 3,200 1,570 36420 1,170 3,410 3,010 1,320 32621 1,020 3,350 2,860 1,220 30522 1,010 3,200 3,150 1,170 29023 1,370 2,950 3,610 1,060 27524 1,600 2,590 4,020 1,410 26725 1,720 2,120 4,470 1,520 25426 1,970 1,660 4,770 1,450 25327 2,500 1,360 4,870 1,350 23328 2,680 1,170 4,730 1,24029 2,820 — 4,400 1,16030 3,320 — 4,010 1,44031 4,470 — 3,590 — — — — — —

TOTAL 85,970 94,780 94,162 55,330 14,696MEAN 2,773 3,385 3,037 1,844 544MAX 4,470 7,060 4,870 3,130 1,420MIN 1,010 1,020 728 1,060 233AC-FT 170,500 188,000 186,800 109,700 29,150YEAR 2003* TOTAL=344,938.00 MEAN=2,347 MAX=7,060 MIN=233 AC-FT=684,200

*Incomplete record

ROOD — 14206295 — Tualatin River at Rood Bridge Road near Hillsboro, Oregon [RM 38.4]

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RCRR – 14206305 – ROCK CREEK AT ROCK CREEK RD NEAR BOWERS JUNCTION, OREGON [RM 15.8]Latitude: 45 37 04 Longitude: 12 53 13 Source Agency: District 18 Watermaster


JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 1 14.0 56.5 3.69 4.00 6.85 .31 .06 .01 .02 .06 .41 2.60 2 19.0 26.7 3.33 3.91 5.82 .28 .05 .01 .02 .05 .33 2.35 3 28.2 18.3 3.30 8.04 5.02 .27 .05 .01 .02 .06 .37 4.09 4 27.2 13.7 3.11 12.0 5.26 .20 .04 .01 .02 .06 .34 3.13 5 17.2 10.4 3.13 9.85 4.73 .17 .04 .02 .02 .07 .31 8.30 6 8.46 8.21 3.33 12.6 4.16 .19 .04 .03 .02 .11 .26 8.64 7 5.32 6.65 25.8 12.9 3.64 .17 .04 .02 .03 .38 .30 6.61 8 3.76 5.45 22.6 12.6 3.53 .12 .04 .19 .06 .22 .30 6.48 9 2.85 4.46 41.0 9.44 3.09 .12 .05 .05 .64 1.13 .31 4.15

10 2.24 3.78 24.1 8.74 2.74 .11 .04 .03 .26 1.15 .29 4.23 11 2.07 3.33 15.4 8.07 2.57 .05 .04 .03 .13 .61 .53 4.68 12 12.4 2.97 14.9 25.5 2.20 .11 .03 .03 .09 1.14 .43 6.66 13 18.1 2.76 16.6 51.4 1.91 .21 .03 .03 .05 .65 .35 34.814 15.8 2.43 14.8 27.3 1.59 .19 .03 .02 .04 .36 .27 39.015 9.16 3.85 13.1 17.6 1.30 .14 .03 .02 .03 .44 .57 18.116 5.93 10.7 10.6 12.6 1.33 .14 .03 .02 .05 .73 1.37 9.37 17 4.33 45.9 8.35 12.3 1.35 .17 .03 .01 .06 .49 1.66 6.32 18 3.51 45.3 7.09 9.75 1.06 .16 .02 .01 .04 .26 1.09 4.74 19 2.85 23.2 7.18 8.01 1.00 .15 .03 .01 .04 .61 3.76 3.79 20 2.40 17.1 7.63 6.17 .95 .15 .03 .01 .04 .59 2.96 3.56 21 2.12 13.4 11.6 6.14 .85 .17 .03 .01 .04 .40 1.75 4.18 22 3.80 11.2 30.7 5.50 .77 .19 .02 .01 .04 .38 1.12 3.70 23 10.8 9.50 20.0 9.88 .66 .19 .01 .01 .05 .53 .91 3.28 24 11.9 7.54 13.4 25.3 .62 .17 .01 .01 .04 .42 1.19 6.42 25 10.7 6.15 11.0 17.9 .60 .16 .01 .01 .04 .39 3.21 15.826 29.6 5.23 11.8 16.6 .57 .14 .01 .01 .03 .37 2.92 9.63 27 17.4 4.30 10.1 14.2 .49 .14 .01 .01 .04 .34 1.73 16.628 9.80 3.82 7.94 10.2 .43 .11 .01 .01 .04 .56 1.59 31.229 13.6 — 6.29 9.00 .32 .09 .01 .01 .04 .66 5.04 23.930 65.2 — 5.30 7.82 .37 .07 .01 .01 .04 .85 3.03 14.231 145 — 4.55 — .45 — .01 .01 — .55 — 9.95

TOTAL 524.70 372.83 381.72 395.32 66.23 4.84 0.89 0.68 2.08 14.62 38.70 320.46MEAN 16.9 13.3 12.3 13.2 2.14 .16 .029 .022 .069 .47 1.29 10.3MAX 145 56.5 41.0 51.4 6.85 .31 .06 .19 .64 1.15 5.04 39.0MIN 2.07 2.43 3.11 3.91 .32 .05 .01 .01 .02 .05 .26 2.35AC-FT 1,040 740 757 784 131 9.6 1.8 1.3 4.1 29 77 636YEAR 2003 TOTAL=2,123.07 MEAN=5.82 MAX=145 MIN=.01 AC-FT=4,210

RCRR — 14206305 — Rock Creek at Rock Creek Road near Bowers Junction, Oregon [RM 15.8]

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RCWU – 14206338 – ROCK CREEK AT WEST UNION RD NEAR BETHANY, OREGON [RM 9.0]Latitude: Longitude: Source Agency: District 18 Watermaster


JAN* FEB* MAR APR* MAY* JUN* JUL* AUG* SEP* OCT* NOV* DEC* 1 129 r 16.6 21.5 36.9 15.2 2 92.7 183 14.3 20.6 27.6 14.1 3 180 95.8 15.0 25.0 22.4 20.7 4 147 64.6 13.2 37.5 24.7 17.2 5 131 48.9 12.8 32.4 20.1 40.1 6 64.2 38.5 13.6 36.1 16.1 47.6 7 41.6 31.5 110 37.3 13.8 32.8 8 30.6 26.1 137 39.5 13.1 30.7 9 24.4 22.2 183 34.5 11.4 22.7

10 19.4 19.3 152 30.2 9.75 24.711 17.0 17.1 74.8 30.0 8.70 27.512 70.1 15.2 71.7 112 7.43 30.313 108 13.6 90.1 r 6.29 86.814 101 11.6 80.1 163 5.15 r15 62.0 14.0 65.9 78.3 4.61 13216 40.3 31.7 51.9 52.3 5.04 4.36 64.017 30.2 r 42.8 56.2 5.33 12.3 46.418 24.4 r 41.7 41.0 4.19 12.1 34.919 20.1 133 39.5 31.3 3.55 21.0 27.420 17.4 80.1 44.9 25.9 17.8 25.321 15.4 58.2 53.9 28.8 12.2 32.222 26.5 45.8 146 24.1 9.51 25.923 43.1 37.8 125 28.0 8.45 22.224 52.5 30.4 71.5 91.5 8.60 44.025 49.8 25.1 52.9 63.8 14.2 10926 104 22.3 58.9 54.7 16.7 72.127 102 19.1 48.1 44.6 12.6 68.628 55.5 16.7 37.9 34.5 12.8 14329 71.4 — 30.9 29.9 25.0 18630 r — 25.8 55.3 18.4 11631 r — 23.1 — — — — 73.7

TOTAL 1,870.6 1,101.6 1,944.9 1,359.8 246.14 206.02 1,633.1MEAN 64.5 44.1 62.7 46.9 13.0 13.7 54.4MAX 180 183 183 163 36.9 25.0 186MIN 15.4 11.6 12.8 20.6 3.55 4.36 14.1AC-FT 3,710 2,190 3,860 2,700 488 409 3,240YEAR 2003* TOTAL=8,362.16 MEAN=47.0 MAX=186 MIN=3.55 AC-FT=16,590*Incomplete record

RCWU — 14206338 — Rock Creek at West Union Road near Bethany, Oregon [RM 9.0]

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RCQR – 14206347 – ROCK CREEK AT QUATAMA ROAD NEAR ORENCO, OREGON [RM 4.9]Latitude: 45 31 25 Longitude: 122 54 34 Source Agency: District 18 Watermaster


JAN* FEB* MAR APR* MAY JUN JUL AUG SEP OCT NOV DEC 1 r 260 r 23.9 30.1 72.2 4.81 1.25 .53 .67 .47 1.34 33.1 2 170 r 293 18.9 29.8 35.9 4.05 1.11 .22 .83 .63 3.14 22.1 3 287 191 25.0 34.4 27.8 3.55 1.28 .31 .90 .67 4.09 55.6 4 269 116 18.2 53.6 36.2 3.20 1.20 .56 .63 .75 1.69 32.3 5 214 75.7 17.2 43.6 24.0 2.69 1.41 1.54 .41 1.09 1.23 97.6 6 100 54.6 20.9 53.5 19.4 2.39 1.27 2.75 .53 2.61 1.13 90.2 7 63.0 42.6 216 55.6 16.9 2.43 1.17 .63 1.32 7.49 1.00 59.9 8 44.0 34.6 256 58.1 16.1 2.66 1.16 37.1 2.85 2.72 1.29 45.3 9 33.5 28.4 266 53.6 14.8 2.74 1.07 6.06 26.3 25.9 1.46 32.1

10 26.0 24.2 229 43.6 13.3 2.59 1.16 3.22 5.75 32.4 1.37 43.2 11 26.5 21.1 114 43.7 12.5 2.35 .94 1.39 2.89 11.8 4.46 40.5 12 168 18.6 116 215 11.6 2.96 1.03 1.53 1.97 10.2 5.61 46.4 13 207 17.7 153 r 10.5 3.30 1.16 1.62 1.74 4.63 2.84 17014 170 14.9 132 r 280 9.53 3.28 1.24 1.29 1.51 4.18 1.60 36815 95.5 24.8 106 121 9.68 3.07 1.21 .94 1.35 8.47 5.24 17916 60.7 56.3 80.8 76.0 11.4 3.11 .95 1.23 5.36 11.9 24.8 69.0 17 43.5 r 239 65.4 94.1 10.5 2.40 .86 1.36 3.80 4.94 19.9 50.2 18 33.9 r 64.4 61.3 8.87 2.02 .66 .87 1.87 3.13 10.6 35.0 19 27.3 r 242 63.2 42.8 7.92 1.67 .60 1.02 1.30 14.5 107 26.0 20 22.9 130 73.8 35.2 7.08 2.47 .57 .97 1.02 5.93 58.4 28.1 21 20.4 93.4 94.8 47.9 5.70 2.79 .60 .91 .88 3.56 12.0 41.8 22 61.4 73.2 235 33.8 6.33 2.45 .63 1.05 .82 3.45 6.88 27.1 23 76.3 58.1 202 53.4 5.99 1.92 .53 .85 1.32 6.59 4.71 21.5 24 83.9 45.3 108 169 5.62 1.81 .51 1.04 1.80 4.02 8.07 76.8 25 75.7 35.4 76.1 99.9 5.59 1.75 .39 1.03 1.47 3.10 39.9 15826 163 30.1 97.0 84.4 5.40 2.02 .47 1.07 .45 2.78 26.2 81.4 27 160 25.0 72.3 60.7 4.76 1.87 .51 .97 1.23 2.84 11.1 82.7 28 86.8 22.4 52.9 44.9 4.56 1.72 .58 .97 1.20 3.46 13.2 16329 142 — 41.7 42.6 3.88 1.67 .42 .88 .39 6.24 82.8 23430 r — 33.4 205 6.80 1.17 .41 .85 .68 9.73 35.5 13431 r — 29.6 — 5.19 — 1.79 1.05 — 2.12 — 76.4

TOTAL 3,191.3 2,007.4 3,102.5 2,266.6 436.00 76.91 28.14 75.81 73.24 202.30 498.55 2,620.3MEAN 110 77.2 100 78.2 14.1 2.56 .91 2.45 2.44 6.53 16.6 84.5MAX 287 293 266 280 72.2 4.81 1.79 37.1 26.3 32.4 107 368MIN 20.4 14.9 17.2 29.8 3.88 1.17 .39 .22 .39 .47 1.00 21.5AC-FT 6,330 3,980 6,150 4,500 865 153 56 150 145 401 989 5,200YEAR 2003* TOTAL=14,579.05 MEAN=40.5 MAX=368 MIN=.22 AC-FT=28,920


RCQR — 14206347 — Rock Creek at Quatama Road near Orenco, Oregon [RM 4.9]

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BCCH – 14206360 – BEAVERTON CREEK AT CEDAR HILLS BLVD [RM 7.45]Latitude: 45 49 31 Longitude: 122 81 05 Source Agency: District 18 Watermaster


JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 1 15.4 37.6 6.50 11.1 13.9 3.45 1.60 1.35 4.73 1.35 2.29 9.87 2 45.9 14.3 6.54 9.39 11.4 3.40 1.61 1.49 4.68 1.29 2.25 12.7 3 25.2 12.1 7.57 15.9 13.1 3.12 1.66 1.54 4.45 1.42 2.34 14.7 4 36.5 10.4 5.75 8.93 14.3 2.96 2.16 1.58 4.86 1.60 2.81 16.7 5 12.4 9.47 5.98 9.14 9.69 2.61 3.15 2.23 4.81 1.88 2.19 42.5 6 9.88 8.84 9.88 14.5 9.01 2.20 3.60 1.60 5.26 8.86 2.67 20.2 7 8.80 8.54 74.2 13.6 10.7 2.05 3.84 1.39 6.90 4.68 2.30 17.5 8 8.09 8.15 24.6 9.00 11.1 1.96 3.88 19.7 4.93 1.83 2.72 8.12 9 7.63 7.72 41.9 11.1 8.34 1.98 3.96 2.83 27.3 19.0 2.53 8.61

10 7.26 7.39 12.8 10.1 7.09 2.18 3.03 3.09 3.30 6.19 2.97 13.211 10.4 7.22 10.0 7.80 6.38 2.23 1.83 2.14 2.14 11.4 3.75 10.412 34.5 6.89 21.7 50.6 6.07 2.42 1.87 1.99 1.94 8.02 2.52 13.513 21.3 6.76 22.0 81.3 5.81 3.48 1.97 1.82 1.86 2.92 2.34 12614 13.3 6.44 19.5 14.3 5.62 2.36 2.15 2.01 1.70 3.18 2.40 53.915 9.24 12.8 11.8 11.2 5.61 2.18 2.45 2.35 1.67 6.79 6.36 12.416 8.16 21.5 9.89 10.4 9.22 2.20 1.92 2.55 6.84 7.94 16.1 10.817 7.48 84.0 8.65 23.1 12.0 2.36 1.83 2.89 3.24 2.69 5.27 9.09 18 7.07 28.5 7.87 10.2 6.75 2.29 1.78 3.41 2.03 1.80 6.35 7.92 19 6.63 12.8 14.4 8.81 5.34 2.19 1.80 3.18 1.59 13.3 81.1 7.62 20 6.34 10.2 9.03 8.26 4.92 2.66 1.92 3.32 1.56 2.69 14.4 16.921 6.46 9.16 21.3 14.7 4.64 2.13 2.18 3.46 1.64 1.73 7.10 15.122 20.3 8.34 32.5 8.27 4.43 1.98 2.46 3.21 1.65 2.96 5.02 8.21 23 8.59 7.70 14.2 29.8 4.31 1.99 2.37 3.25 1.44 3.46 4.99 7.32 24 10.8 7.18 9.90 16.8 4.39 2.21 1.57 3.29 1.58 1.77 6.68 30.325 9.73 6.77 9.31 13.4 4.77 2.21 1.52 3.90 1.59 1.55 14.7 27.226 23.2 6.46 27.4 11.1 4.20 2.07 1.51 3.97 1.58 1.55 7.51 10.527 9.42 6.09 11.1 8.91 4.06 1.82 1.58 4.20 1.53 2.34 4.39 33.328 7.97 7.37 8.77 8.76 3.91 1.82 1.61 4.44 1.77 4.12 16.8 35.729 46.8 — 7.73 50.0 4.01 1.79 1.69 4.40 2.32 5.59 43.6 45.830 84.1 — 7.32 67.9 4.29 1.77 1.40 4.26 1.84 4.30 8.39 12.731 230 — 7.34 — 3.60 — 1.36 4.28 — 3.87 — 18.5

TOTAL 758.85 380.69 487.43 568.37 222.96 70.07 67.26 105.12 112.73 142.07 284.84 677.26MEAN 24.5 13.6 15.7 18.9 7.19 2.34 2.17 3.39 3.76 4.58 9.49 21.8MAX 230 84.0 74.2 81.3 14.3 3.48 3.96 19.7 27.3 19.0 81.1 126MIN 6.34 6.09 5.75 7.80 3.60 1.77 1.36 1.35 1.44 1.29 2.19 7.32AC-FT 1,510 755 967 1,130 442 139 133 209 224 282 565 1,340YEAR 2003 TOTAL=3,877.65 MEAN=10.6 MAX=230 MIN=1.29 AC-FT=7,690

BCCH — 14206360 — Beaverton Creek at Cedar Hills Blvd at Beaverton, Oregon [RM 7.45]

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ECMR – 14206365 – ERICKSON CREEK AT MENLO DRIVE AT BEAVERTON, OREGON [RM 0.76]Latitude: 45 29 14 Longitude: 122 58 54 Source Agency: District 18 Watermaster


JAN* FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC* 1 1.65 4.48 .45 1.07 .88 .13 .08 .14 .17 .09 .08 1.33 2 r 4.14 1.58 .50 .77 .63 .13 .09 .14 .16 .09 .09 2.78 3 2.29 1.14 .56 1.91 1.13 .14 .09 .09 .16 .10 .10 2.03 4 4.48 .75 .34 .88 1.26 .11 .09 .07 .16 .09 .10 3.71 5 1.04 .59 .34 .99 .49 .13 .11 .08 .11 .10 .09 8.54 6 .63 .47 1.00 1.56 .43 .12 .12 .08 .11 1.87 .10 3.82 7 .45 .42 r 24.1 1.38 .47 .12 .12 .09 .95 .49 .10 3.52 8 .35 .35 18.1 .74 .69 .12 .14 r 2.35 .68 .15 .13 .84 9 .28 .31 r 29.8 .97 .37 .10 .14 .41 r 3.26 r 2.08 .12 1.22

10 .23 .28 12.8 1.01 .32 .13 .14 .31 .19 .80 .19 2.34 11 .78 .27 9.17 .58 .30 .11 .13 .17 .12 2.23 .22 1.60 12 4.43 .25 9.46 r 17.8 .28 .11 .13 .16 .11 1.04 .14 2.42 13 2.43 .24 2.59 r .26 .18 .10 .18 .10 .24 .16 r14 1.17 .23 2.24 10.6 .24 .11 .09 .17 .10 .37 .14 r 19.015 .62 1.43 1.11 7.31 .26 .11 .09 .14 .11 .96 .86 4.65 16 .46 2.65 .74 6.33 1.35 .10 .07 .17 .91 .87 2.97 1.84 17 .37 r 16.0 .60 12.4 1.11 .10 .08 .16 .24 .15 .41 1.02 18 .32 4.70 .50 4.25 .43 .09 .07 .16 .12 .10 .80 .74 19 .28 1.47 1.58 3.79 .31 .10 .07 .17 .12 2.09 r 11.6 .69 20 .25 .87 .69 3.13 .26 .14 .07 .21 .11 .16 2.58 3.20 21 .24 .71 2.15 9.66 .22 .14 .07 .18 .11 .11 .71 2.70 22 2.44 .57 4.63 3.00 .20 .13 .07 .14 .09 .34 .42 .83 23 .60 .49 1.07 5.76 .19 .11 .08 .16 .08 .27 .46 .73 24 .99 .42 .71 1.84 .19 .12 .09 .16 .09 .13 .70 8.68 25 .80 .37 .77 1.23 .19 .10 .09 .15 .09 .13 2.02 5.63 26 2.68 .35 r 5.12 .87 .15 .10 .09 .17 .08 .11 1.22 1.44 27 .69 .33 .84 .55 .14 .10 .09 .17 .08 .10 .35 9.04 28 .49 .64 .61 .60 .15 .10 .09 .18 .08 .10 3.90 7.96 29 7.04 — .50 r 3.78 .15 .10 .09 .15 .09 .48 7.70 8.43 30 r 10.7 — .45 r 7.89 .15 .07 .13 .19 .09 .15 1.16 1.96 31 r — .43 — .13 — .15 .17 — .08 — 3.51

TOTAL 53.32 42.36 133.95 112.65 13.33 3.45 3.06 7.27 8.87 16.07 39.62 116.20MEAN 1.78 1.51 4.32 3.88 .43 .12 .099 .23 .30 .52 1.32 3.87MAX 10.7 16.0 29.8 17.8 1.35 .18 .15 2.35 3.26 2.23 11.6 19.0MIN .23 .23 .34 .55 .13 .07 .07 .07 .08 .08 .08 .69AC-FT 106 84 266 223 26 6.8 6.1 14 18 32 79 230YEAR 2003* TOTAL=550.15 MEAN=1.52 MAX=29.8 MIN=.07 AC-FT=1,090*Incomplete record; r = At least one measurement of flow & stage exceeded rating curve (an estimate of mean daily flow was calculated if possible)

ECMR — 14206365 — Erickson Creek at Menlo Drive at Beaverton, Oregon [RM 0.76]

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JCDV – 14206372 – JOHNSON CREEK AT DAVIS ROAD [RM 1.3]Latitude:45 28 30 Longitude:122 49 52 Source Agency: District 18 Watermaster


JAN* FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 1 9.48 22.9 3.00 6.11 7.22 .84 .53 .31 .95 .15 .59 6.03 2 r 16.5 10.3 2.05 4.63 5.34 .97 .48 .38 .48 .14 .47 6.61 3 14.6 7.20 2.73 9.15 5.50 .91 .44 .29 .20 .15 .71 8.90 4 20.3 5.57 1.84 6.00 6.03 .94 .46 .29 .19 .14 .62 9.74 5 7.98 4.08 1.67 5.27 3.60 .93 .44 .31 .10r .14 .61 19.9 6 5.23 3.32 2.80 8.23 2.90 1.05 .52 .39 r .09 2.57 .58 14.1 7 3.83 2.77 r 25.1 5.41 2.44 .98 .45 .37 1.92 2.51 .51 10.7 8 3.09 2.37 13.8 4.37 2.48 .88 .40 r 8.06 2.47 .76 .70 5.42 9 2.53 2.06 20.8 4.90 1.95 .92 .41 2.52 12.6 7.04 .67 5.14

10 2.10 1.79 9.28 4.91 1.65 .91 .43 1.66 2.02 3.71 .77 7.22 11 3.08 1.62 6.46 3.88 1.80 1.24 .41 1.14 1.37 5.66 .71 5.40 12 16.5 1.55 9.38 23.8 2.24 .84 .38 .90 .99 4.60 .52 7.06 13 10.7 1.40 11.8 r 32.4 2.16 1.27 .38 .80 .67 2.38 .43 r 45.214 7.16 1.27 10.1 11.7 2.02 1.01 .37 .73 .51 2.82 .41 30.215 4.53 3.94 7.22 9.10 2.40 .84 .37 .68 .44 4.50 1.51 10.316 3.56 7.15 5.12 6.49 7.16 .79 .39 .63 1.39 4.82 6.57 8.47 17 2.88 r 32.4 4.11 8.33 4.38 .80 .35 .52 .73 2.82 3.00 6.19 18 2.34 16.5 3.46 4.78 3.19 .77 .37 .50 .36 1.81 4.04 4.70 19 2.01 8.99 5.92 4.36 2.16 .72 .32 .44 .25 8.14 r 22.9 4.01 20 1.78 6.08 4.40 3.47 2.02 1.17 .29 .43 .26 3.02 7.98 7.25 21 1.62 4.84 8.03 5.75 1.72 1.23 .28 .38 .22 3.95 4.20 9.04 22 7.30 3.95 16.9 3.26 1.53 .95 .26 .38 .16 4.13 2.86 4.97 23 3.75 3.31 7.86 9.62 1.59 .91 .24 .35 .17 5.69 2.29 4.24 24 4.42 2.84 5.63 9.82 1.63 .79 .30 .34 .18 3.83 3.32 16.525 3.71 2.44 4.61 6.31 1.23 .74 .28 .29 .16 3.22 5.38 18.726 10.7 2.24 11.5 5.27 1.15 .71 .22 .26 .17 2.07 3.99 7.44 27 4.88 1.90 6.31 4.04 1.18 .71 .23 .33 .13 1.42 2.59 20.028 3.63 2.50 4.49 3.60 1.17 .61 .23 .31 .11 1.36 6.82 20.129 15.1 — 3.66 7.65r 1.20 .61 .26 .24r .12 3.34 18.2 22.330 31.8 r — 3.29 r 18.0 1.20 .54 .24 .36 .14 1.95 6.12 9.91 31 r — 3.05 — 1.03 — .25 r .13 — .94 — 12.0

TOTAL 227.09 167.28 226.37 240.61 83.27 26.58 10.98 24.72 29.55 89.78 110.07 367.74MEAN 7.57 5.97 7.30 8.02 2.69 .89 .35 .80 .99 2.90 3.67 11.9MAX 31.8 32.4 25.1 32.4 7.22 1.27 .53 8.06 12.6 8.14 22.9 45.2MIN 1.62 1.27 1.67 3.26 1.03 .54 .22 .13 .09 .14 .41 4.01AC-FT 450 332 449 477 165 53 22 49 59 178 218 729YEAR 2003* TOTAL=1,604.04 MEAN=4.41 MAX=45.2 MIN=.09 AC-FT=3,180


JCDV — 14206372 — Johnson Creek at Davis Road near Beaverton, Oregon [RM 1.3]

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CMMB – 14206395 – CEDAR MILL CREEK AT MURRAY BLVD [RM 1.64] Latitude: 45 30 37 Longitude: 122 49 18 Source Agency: District 18 Watermaster


JAN* FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 1 43.9 r 90.8 6.37 17.6 26.9 4.10 3.15 2.34 1.31 1.74 1.66 11.8 2 r 58.1 24.7 7.31 13.8 16.7 4.26 3.07 2.08 2.37 1.89 1.70 10.7 3 69.9 17.3 11.6 19.9 16.2 4.17 2.97 2.29 2.60 1.94 1.93 21.3 4 80.6 11.7 7.78 15.6 22.5 3.96 2.98 2.15 1.95 2.06 2.01 13.6 5 30.9 10.9 9.55 11.8 12.6 3.84 2.87 2.91 1.51 2.01 1.74 52.6 6 17.1 11.8 12.8 19.8 10.5 3.80 2.89 2.82 1.90 7.12 1.70 31.4 7 12.4 11.6 90.4 18.8 10.9 3.78 2.70 2.34 4.19 9.65 1.64 21.9 8 10.2 8.75 45.8 13.4 13.2 3.93 2.55 20.0 7.13 3.02 1.80 9.58 9 8.74 8.50 52.8 15.2 9.46 4.02 2.64 4.69 25.5 14.5 1.79 8.31

10 7.90 7.55 29.1 13.7 8.54 4.09 2.64 3.25 4.26 10.3 1.99 17.6 11 12.1 6.84 21.7 11.3 8.18 3.96 2.58 2.73 2.56 12.8 3.34 11.7 12 69.0 7.71 34.2 61.1 7.61 3.95 2.47 2.40 1.92 12.9 2.21 17.6 13 52.8 7.02 38.3 r 105 7.21 4.02 2.32 2.24 1.80 3.88 1.79 T 96.814 36.8 7.15 35.4 33.0 6.74 3.58 2.40 2.38 1.84 3.07 1.75 77.4 15 16.4 16.4 27.3 19.4 6.80 3.34 2.61 2.50 1.94 9.17 3.70 25.3 16 11.4 28.5 20.8 16.5 8.93 3.58 2.47 2.43 9.35 12.0 16.3 14.2 17 9.46 86.1 r 17.0 31.1 7.14 3.87 2.48 2.51 3.96 4.22 7.70 11.7 18 8.39 52.4 13.7 15.4 6.04 4.15 2.53 2.35 2.32 2.81 5.37 8.21 19 7.67 29.2 20.8 11.7 4.90 3.39 2.49 2.31 2.25 14.7 79.6 7.51 20 7.15 21.0 18.1 10.4 4.64 3.33 2.48 2.15 2.06 4.03 28.8 14.4 21 7.31 15.4 32.4 20.1 4.70 3.68 3.87 2.12 1.82 2.64 10.4 20.0 22 40.7 13.4 60.6 10.6 4.97 3.63 2.72 2.35 1.73 2.97 4.55 8.95 23 21.9 10.2 34.6 28.5 5.54 3.61 2.07 2.19 1.93 4.24 3.84 7.38 24 23.4 8.49 23.6 42.0 5.79 3.38 2.12 2.13 1.87 2.69 6.08 33.3 25 17.0 7.77 18.4 21.1 6.05 3.41 2.10 2.18 1.94 2.45 19.2 41.2 26 68.4 7.42 32.3 18.7 5.69 3.26 2.42 3.30 1.68 2.50 7.54 16.9 27 27.0 5.71 18.5 12.9 5.59 3.28 2.31 2.27 1.57 2.62 4.17 31.9 28 13.8 5.57 15.1 11.0 5.42 3.26 2.07 2.23 1.46 2.67 12.5 45.1 29 46.3 — 11.9 r 35.4 5.11 3.26 2.10 1.92 1.72 2.62 49.9 58.9 30 95.2 — 11.0 r 128 4.89 3.18 2.02 2.03 1.83 2.46 11.7 25.7 31 r — 10.8 — 4.61 — 2.44 1.80 — 1.76 — 23.2

TOTAL 931.92 539.88 790.01 802.8 274.05 111.07 79.53 93.39 100.27 163.43 298.40 796.14MEAN 31.1 19.3 25.5 26.8 8.84 3.70 2.57 3.01 3.34 5.27 9.95 25.7MAX 95.2 90.8 90.4 128 26.9 4.26 3.87 20.0 25.5 14.7 79.6 96.8MIN 7.15 5.57 6.37 10.4 4.61 3.18 2.02 1.80 1.31 1.74 1.64 7.38AC-FT 1,850 1,070 1,570 1,590 544 220 158 185 199 324 592 1,580YEAR 2003* TOTAL=4,980.89 MEAN=13.7 MAX=128 MIN=1.31 AC-FT=9,880*Incomplete record; r = At least one measurement of flow & stage exceeded rating curve (an estimate of mean daily flow was calculated if possible)

CMMB — 14206395 — Cedar Mill Creek at Murray Boulevard near Beaverton, Oregon [RM 1.64]

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WC143 – 14206410 – WILLOW CREEK AT NW 143RD AVE NEAR BEAVERTON, OREGON [RM 3.5]Latitude: 45 32 12 Longitude: 122 49 24 Source Agency: District 18 Watermaster


JAN* FEB MAR APR* MAY JUN* JUL AUG SEP OCT NOV DEC 1 4.78 8.32 1.04 2.03 2.30 .32 .24 .17 .15 .16 .16 2.33 2 17.2 3.40 1.06 1.50 1.65 .31 .22 .20 .12 .16 .25 2.14 3 6.81 2.50 1.38 2.32 1.68 .29 .22 .22 .13 .15 .26 3.27 4 9.88 2.01 .89 1.64 2.34 .28 .23 .22 .13 .15 .19 2.45 5 3.24 1.70 .88 1.41 1.26 .28 .25 .60 .13 .15 .15 9.38 6 2.12 1.47 1.61 2.60 1.07 .25 .25 .52 .13 1.08 .15 5.08 7 1.62 1.34 20.0 2.66 1.00 .21 .22 .36 .31 1.05 .14 3.22 8 1.38 1.23 6.23 1.68 1.06 .26 .25 9.21 1.10 .30 .18 1.78 9 1.21 1.11 8.86 2.18 .88 .34 .27 1.36 6.18 4.43 .19 1.38

10 1.07 1.05 2.96 2.11 .82 .33 .27 .81 .86 2.20 .25 3.21 11 1.82 1.01 2.05 1.44 .78 r .28 .53 .45 2.43 .72 2.05 12 9.65 .95 4.96 13.4 .74 .46 .21 .43 .32 1.98 .31 3.02 13 5.83 .90 4.91 r .69 .11 .19 .38 .24 .63 .19 44.4 14 3.60 .84 3.59 3.57 .66 .30 .25 .36 .20 .51 .18 11.6 15 1.93 2.12 2.62 3.59 .72 .27 .26 .34 .19 1.50 .58 3.44 16 1.49 3.84 2.20 2.93 1.07 .27 .27 .33 1.50 1.78 2.43 2.36 17 1.25 29.6 1.95 6.90 .75 .29 .21 .32 .51 .62 1.20 1.98 18 1.12 6.45 1.69 2.23 .60 .27 .20 .35 .28 .37 .97 1.38 19 .99 3.29 2.77 1.68 .52 .26 .18 .30 .25 2.31 29.0 1.34 20 .91 2.24 1.98 1.45 .80 .29 .18 .24 .20 .54 2.41 2.55 21 1.05 1.77 5.02 3.13 .55 .32 .21 .21 .17 .34 1.32 3.10 22 5.72 1.50 10.8 1.48 .19 .31 .20 .23 .12 .35 .78 1.62 23 2.41 1.33 3.40 5.48 .45 .33 .18 .24 .14 .51 .63 1.23 24 2.93 1.16 2.10 6.71 .48 .35 .17 .19 .14 .26 1.28 6.57 25 2.30 1.03 1.88 3.28 .47 .34 .18 .18 .14 .20 4.09 7.49 26 7.96 1.00 4.69 2.49 .43 .30 .15 .20 .11 .17 1.40 2.42 27 2.64 .92 2.08 1.68 .42 .27 .15 .20 .10 .17 .74 5.39 28 1.80 1.11 1.60 1.42 .37 .25 .18 .20 .12 .18 2.88 7.51 29 10.8 — 1.32 13.0 .33 .22 .20 .19 .13 .43 9.54 11.4 30 19.4 — 1.19 16.1 .36 .20 .20 .17 .15 .48 1.85 3.55 31 r — 1.22 — .37 — .18 .15 — .17 — 3.75

TOTAL 134.91 85.19 108.93 112.09 25.81 8.28 6.65 19.41 14.70 25.76 64.42 162.39MEAN 4.50 3.04 3.51 3.87 .83 .29 .21 .63 .49 .83 2.15 5.24MAX 19.4 29.6 20.0 16.1 2.34 .46 .28 9.21 6.18 4.43 29.0 44.4MIN .91 .84 .88 1.41 .19 .11 .15 .15 .10 .15 .14 1.23AC-FT 268 169 216 222 51 16 13 38 29 51 128 322YEAR 2003* TOTAL=768.54 MEAN=2.12 MAX=44.4 MIN=.10 AC-FT=1,520*Incomplete record; r = At least one measurement of flow & stage exceeded rating curve (an estimate of mean daily flow was calculated if possible)

WC143 — 14206410 — Willow Creek at 143rd Avenue near Beaverton, Oregon [RM 3.5]

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WCHP – 14206413 – WILLOW CREEK AT HERITAGE PKWY NEAR BEAVERTON, OREGON [RM 0.75]Latitude: 45 31 12 Longitude: 122 51 35 Source Agency: District 18 Watermaster


JAN* FEB MAR APR* MAY JUN JUL AUG SEP OCT NOV* DEC 1 24.2 34.9 4.49 9.05 9.02 1.08 .72 .40 .46 .36 .58 15.6 2 37.8 15.6 3.85 6.29 6.24 1.00 .72 .47 .46 .34 .90 11.8 3 35.5 11.6 6.21 11.9 6.20 .97 .70 .51 .60 .38 1.03 20.4 4 45.5 8.92 3.39 7.50 9.46 .86 .77 .63 .43 .39 .77 13.7 5 17.3 7.00 3.72 5.33 4.75 .87 .79 1.12 .45 .41 .63 45.9 6 10.6 5.50 6.35 11.3 3.88 .81 .81 1.23 .46 3.88 .63 28.1 7 7.67 4.75 53.8 11.1 3.43 .86 .77 .75 .92 4.05 .48 20.2 8 6.18 4.26 26.5 6.62 3.92 .79 .67 27.1 3.36 1.06 .78 10.6 9 6.94 3.80 35.7 9.31 2.79 .97 .69 3.83 19.1 6.62 .78 9.06

10 6.69 3.51 13.2 8.36 2.52 1.01 .65 1.78 2.56 7.23 .78 19.711 11.2 3.27 8.67 5.54 2.36 .90 .67 1.36 1.35 8.67 2.04 12.912 44.6 3.05 19.4 41.8 2.19 1.13 .65 1.07 .97 6.92 1.20 18.313 31.7 2.90 20.7 r 2.03 1.02 .55 .95 .79 2.05 .74 77.214 21.8 2.71 16.2 17.3 1.89 .93 .59 .84 .69 1.81 .61 52.715 11.6 8.11 12.2 9.64 2.04 .87 .58 .85 .64 5.46 2.29 17.316 8.63 15.1 8.67 10.2 3.85 .83 .58 .76 4.53 6.09 14.5 12.417 7.29 r 59.7 7.65 24.7 2.52 .84 .54 .77 1.71 2.09 6.27 10.318 6.45 27.7 6.39 7.96 1.93 .91 .57 .75 .85 1.34 4.22 6.6419 5.76 14.9 11.7 5.97 1.70 .92 .48 .68 .68 9.78 r 6.4920 5.23 9.62 8.59 5.19 1.78 1.24 .40 .65 .53 2.13 14.2 14.021 5.90 7.10 20.0 12.3 1.62 1.44 .44 .57 .50 1.40 6.36 17.022 30.2 5.86 36.1 5.48 1.42 1.20 .42 .59 .43 1.44 3.38 7.6323 14.5 4.94 14.6 18.4 1.31 1.17 .41 .62 .39 2.29 2.72 6.0724 17.1 4.33 8.35 23.9 1.42 .99 .40 .62 .42 1.17 6.78 35.225 11.8 3.93 7.10 12.1 1.34 .93 .43 .62 .33 .92 22.7 34.626 34.9 3.67 20.7 9.58 1.28 .83 .46 .59 .34 .81 8.66 12.827 12.9 3.35 8.39 5.92 1.31 .79 .36 .65 .26 .81 4.47 27.828 8.39 4.27 6.40 4.96 1.16 .79 .35 .58 .23 .85 13.4 34.329 39.3 — 5.13 13.5 1.11 .71 .37 .57 .24 2.19 43.0 43.930 66.3 — 4.56 46.1 1.34 .75 .41 .55 .29 2.17 13.4 15.431 r — 4.58 — 1.23 — .42 .47 — .75 — 17.1

TOTAL 593.93 284.35 413.29 367.30 89.04 28.41 17.37 52.93 44.97 85.86 178.30 675.09MEAN 19.8 10.2 13.3 12.7 2.87 .95 .56 1.71 1.50 2.77 6.15 21.8MAX 66.3 59.7 53.8 46.1 9.46 1.44 .81 27.1 19.1 9.78 43.0 77.2MIN 5.23 2.71 3.39 4.96 1.11 .71 .35 .40 .23 .34 .48 6.07AC-FT 1,180 564 820 729 177 56 34 105 89 170 354 1,340YEAR 2003* TOTAL=2,830.84 MEAN=7.82 MAX=77.2 MIN=.23 AC-FT=5,610


WCHP — 14206413 — Willow Creek at Heritage Parkway near Beaverton, Oregon [RM 0.75]

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BCSR – 14206419 – BRONSON CREEK AT SALTZMAN ROAD [RM 5.1]Latitude: 45 33 19 Longitude: 122 48 25 Source Agency: District 18 Watermaster


JAN* FEB MAR* APR MAY JUN JUL AUG SEP OCT NOV DEC 1 3.76 8.06 .84 1.30 2.92 .27 .13 .06 .02 .06 .07 .44 2 r 6.75 4.24 .79 1.13 2.24 .25 .12 .05 .03 .07 .10 .40 3 5.94 3.18 .82 1.15 1.92 .24 .12 .04 .03 .07 .09 .81 4 7.11 2.56 .73 1.19 1.94 .25 .11 .04 .03 .06 .10 .49 5 3.81 2.15 .73 1.14 1.54 .26 .09 .05 .03 .06 .09 3.31 6 1.86 .80 1.46 1.36 .25 .10 .06 .03 .08 .09 1.72 7 1.72 5.64 1.62 1.24 .26 .10 .04 .03 .11 .10 .85 8 1.54 3.78 1.45 1.17 .24 .11 .15 .05 .07 .13 .50 9 1.40 1.44 1.05 .23 .12 .06 .22 .32 .14 .47

10 1.34 1.43 .98 .23 .11 .05 .05 .16 .11 .8711 1.74 1.31 .93 .24 .12 .05 .05 .15 .09 .6212 1.44 5.09 .88 .22 .09 .04 .04 .15 .07 .9913 1.18 r 9.94 .81 .24 .10 .03 .03 .07 .08 22.414 3.68 1.12 3.58 .71 .21 .09 .04 .04 .06 .08 11.215 2.58 1.31 3.78 .63 .19 .10 .04 .04 .11 .14 2.6316 2.14 1.86 3.38 .62 .19 .10 .04 .08 .16 .30 1.3517 1.88 7.95 4.32 .60 .20 .08 .03 .05 .09 .22 .9718 1.74 5.08 2.79 .51 .20 .08 .03 .04 .08 .22 .6919 1.59 3.20 2.30 .49 .18 .08 .03 .04 .21 2.35 .5920 1.56 2.43 2.03 .48 .19 .07 .03 .04 .15 .36 .9721 1.54 2.02 2.28 .47 .18 .10 .04 .03 .15 .20 1.1822 2.84 1.61 1.81 .43 .17 .10 .04 .03 .15 .14 .7023 2.46 1.36 3.12 .44 .17 .09 .03 .04 .13 .15 .5924 2.69 1.11 5.03 .43 .16 .08 .02 .04 .10 .19 2.2325 2.58 1.00 3.10 .40 .15 .07 .03 .04 .09 .47 5.1826 6.63 .96 2.52 2.65 .36 .15 .05 .04 .04 .09 .24 1.4727 3.71 .90 1.88 2.15 .34 .16 .05 .03 .04 .09 .17 2.6428 2.79 .88 1.66 1.91 .33 .15 .06 .03 .06 .11 .42 5.8229 7.97 — 1.47 r 3.51 .32 .15 .06 .02 .06 .13 2.26 8.1030 21.6 — 1.37 8.82 .31 .14 .06 .03 .07 .12 .39 2.4531 r — 1.31 — .29 — .05 .02 — .07 — 1.76

TOTAL 97.35 65.20 24.34 86.21 27.14 6.12 2.79 1.29 1.42 3.52 9.56 84.39MEAN 4.43 2.33 1.74 2.87 .88 .20 .090 .042 .047 .11 .32 2.72MAX 21.6 8.06 5.64 9.94 2.92 .27 .13 .15 .22 .32 2.35 22.4MIN 1.54 .88 .73 1.13 .29 .14 .05 .02 .02 .06 .07 .40AC-FT 193 129 48 171 54 12 5.5 2.6 2.8 7.0 19 167YEAR 2003* TOTAL=409.33 MEAN=1.21MAX=22.4MIN=.02 AC-FT=812*Incomplete record; r = At least one measurement of flow & stage exceeded rating curve (an estimate of mean daily flow was calculated if possible)

BCSR — 14206419 — Bronson Creek at Saltzman Road near Oregon, Oregon [RM 5.1]

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BCBR – 14206423 – BRONSON CREEK AT BRONSON ROAD [RM 2.1]Latitude: 45 32 18 Longitude: 122 51 15 Source Agency: District 18 Watermaster


JAN* FEB* MAR APR* MAY JUN JUL AUG SEP OCT NOV DEC* 1 15.2 r 4.37 6.72 12.3 1.71 .57 .25 .18 .19 .44 5.99 2 18.9 23.8 3.67 6.83 8.95 1.46 .53 .29 .19 .35 .60 4.83 3 r 33.4 16.4 4.90 6.96 7.52 1.39 .51 .28 .22 .22 .79 9.24 4 32.0 12.5 3.66 7.41 8.70 1.32 .58 .32 .23 .21 .47 4.55 5 15.7 9.95 3.50 6.08 6.49 1.39 .51 .55 .19 .22 .38 21.5 6 8.68 8.42 4.29 8.60 5.61 1.40 .61 .84 .19 .68 .31 15.6 7 6.21 7.27 r 35.1 9.14 4.97 1.43 .67 .44 .35 2.83 .30 8.26 8 4.64 6.53 23.8 8.51 4.77 1.38 .68 10.5 1.11 1.03 .39 5.92 9 3.92 5.80 32.5 8.97 4.45 1.33 .67 3.46 7.48 3.15 .39 3.99

10 3.38 5.57 17.0 8.03 4.06 1.33 .59 1.65 3.37 11.5 .42 6.9711 3.70 5.18 10.7 7.55 3.93 1.36 .56 1.08 1.51 4.27 1.19 6.1512 20.5 4.94 14.5 34.1 3.81 1.25 .57 .88 .90 5.20 .71 7.5613 16.4 4.65 17.6 r 3.60 1.29 .56 .69 .70 2.28 .39 r 35.114 14.8 4.04 15.2 21.6 3.31 1.22 .58 .51 .50 1.47 .37 r15 7.79 5.69 13.0 12.7 3.03 1.10 .66 .52 .40 2.24 .98 13.416 6.38 10.1 9.68 13.1 3.24 .97 .50 .44 1.52 3.86 3.31 7.3817 4.71 r 34.2 8.80 18.7 3.23 .97 .41 .47 1.66 2.16 4.67 6.7018 3.95 r 40.8 8.47 11.0 2.84 .95 .36 .47 .72 1.18 2.57 4.5619 3.41 16.7 9.20 8.69 2.67 .93 .33 .39 .55 3.82 r 26.7 3.6620 3.46 11.4 10.2 7.63 2.55 .95 .33 .28 .45 2.53 10.4 4.7721 3.41 9.20 12.9 10.6 2.48 .99 .41 .27 .33 1.49 3.89 8.8722 10.7 7.75 30.1 7.56 2.46 .98 .42 .28 .33 1.27 2.38 4.6623 10.1 6.35 16.9 11.2 2.41 .98 .30 .25 .26 1.48 1.64 3.6524 8.99 5.04 10.8 26.9 2.36 .95 .26 .23 .22 .87 2.59 14.225 7.58 4.33 9.08 14.8 2.29 .88 .25 .22 .20 .67 8.31 26.426 21.1 4.16 13.6 13.2 2.11 .85 .27 .24 .23 .66 5.32 9.3127 12.2 3.89 9.04 9.14 2.02 .81 .28 .25 .20 .69 2.47 11.428 8.10 3.89 7.64 7.82 2.03 .82 .30 .24 .16 .89 2.80 19.129 19.7 — 6.74 8.19 1.80 .75 .32 .20 .21 1.36 22.9 34.630 r — 6.29 r 34.2 1.86 .66 .30 .25 .21 1.56 6.46 13.931 r — 6.17 — 1.91 — .31 .19 — .66 — 9.72

TOTAL 329.01 278.55 379.40 355.93 123.76 33.80 14.20 26.93 24.77 60.99 114.54 331.94MEAN 11.3 10.3 12.2 12.3 3.99 1.13 .46 .87 .83 1.97 3.82 11.1MAX 33.4 40.8 35.1 34.2 12.3 1.71 .68 10.5 7.48 11.5 26.7 35.1MIN 3.38 3.89 3.50 6.08 1.80 .66 .25 .19 .16 .19 .30 3.65AC-FT 653 553 753 706 245 67 28 53 49 121 227 658YEAR 2003* TOTAL=2,073.82 MEAN=5.76 MAX=40.8 MIN=.16 AC-FT=4,110


BCBR — 14206423 — Bronson Creek at Bronson Road near Orenco, Oregon [RM 2.1]

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BVTS – 14206435 – BEAVERTON CREEK AT SW 216TH AVE NEAR ORENCO, OREGON [RM 1.2]Latitude: 45 31 15 Longitude: 122 53 59 Source Agency: District 18 Watermaster


JAN* FEB* MAR APR MAY JUN JUL AUG SEP OCT NOV DEC* 1 242 r 45.9 53.1 158 12.9 8.32 6.91 4.54 5.97 10.2 68.8 2 144 257 35.8 66.9 68.2 12.2 8.18 6.27 4.99 7.41 8.66 53.8 3 341 149 50.9 69.4 54.9 11.9 7.56 6.54 6.20 5.13 9.30 110 4 276 101 36.5 89.2 84.5 11.5 7.88 7.06 4.83 4.68 9.65 56.8 5 180 69.6 34.7 53.2 54.2 11.2 8.43 8.01 5.21 4.85 9.71 216 6 75.9 53.7 45.2 80.8 41.8 10.8 8.69 10.4 4.27 7.42 8.58 195 7 54.5 46.4 288 73.1 38.1 10.8 8.37 7.65 5.89 43.4 8.67 100 8 44.7 42.0 290 70.7 48.6 10.5 7.93 101 21.8 13.8 9.59 71.5 9 38.8 38.4 267 68.4 35.5 10.5 7.43 48.8 83.2 26.2 10.9 44.4

10 34.3 36.1 164 58.6 30.9 11.0 7.77 15.5 49.8 70.8 9.90 73.211 37.0 34.0 83.4 57.7 27.8 10.9 7.84 11.9 13.7 39.4 13.4 68.212 195 32.3 101 243 25.5 10.9 8.36 9.05 9.27 58.5 17.6 84.013 197 31.0 149 r 471 24.0 11.5 7.87 8.16 7.59 27.2 12.2 r 20714 152 29.1 147 284 22.9 11.9 7.36 7.10 6.51 15.1 10.4 r15 71.9 47.7 110 97.0 21.8 10.4 8.23 6.91 6.06 23.6 15.1 22016 50.2 103 74.7 78.9 29.3 9.79 8.02 7.20 19.2 44.9 54.1 73.117 42.2 271 67.1 131 37.7 9.73 7.21 6.88 19.2 22.3 81.6 65.618 36.9 r 452 56.5 84.0 36.9 10.1 7.34 6.78 10.5 11.7 38.2 46.719 32.9 168 64.8 56.1 21.7 9.52 7.41 5.89 7.31 41.9 224 39.020 30.5 86.4 90.1 49.7 18.7 9.75 6.99 5.46 6.54 31.4 240 51.121 30.2 66.0 91.5 80.7 18.1 11.2 6.99 5.54 5.79 13.1 67.8 10322 97.3 56.7 236 55.9 17.4 10.8 8.54 5.59 5.84 10.5 34.0 57.823 109 48.8 157 75.1 16.9 10.1 7.01 5.15 5.04 18.3 23.6 41.024 77.1 42.7 82.9 212 17.0 9.36 6.46 4.85 5.39 12.7 35.8 13125 61.0 38.6 62.0 93.6 16.8 8.90 6.40 4.94 5.76 9.46 76.3 24226 155 36.5 125 87.8 15.4 8.78 6.51 5.60 5.12 8.26 67.4 10627 112 35.7 90.1 58.7 14.3 8.78 6.85 6.56 4.72 8.15 36.1 11628 57.3 36.7 63.9 46.9 14.1 8.95 6.35 4.43 4.64 12.4 30.5 21929 130 — 49.5 56.9 13.6 8.87 6.34 4.46 4.81 13.6 223 32530 409 — 44.1 r 372 14.9 8.62 6.91 4.76 5.84 21.1 105 16831 r — 42.7 — 14.6 — 6.52 4.21 — 14.1 — 93.3

TOTAL 3,514.7 2,409.4 3,246.3 3,375.4 1,054.1 312.15 232.07 349.56 349.56 647.33 1,501.26 3,446.3MEAN 117 89.2 105 113 34.0 10.4 7.49 11.3 11.7 20.9 50.0 115MAX 409 452 290 471 158 12.9 8.69 101 83.2 70.8 240 325MIN 30.2 29.1 34.7 46.9 13.6 8.62 6.34 4.21 4.27 4.68 8.58 39.0AC-FT 6,970 4,780 6,440 6,700 2,090 619 460 693 693 1,280 2,980 6,840YEAR 2003* TOTAL=20,438.13 MEAN=56.5 MAX=471 MIN=4.21 AC-FT=40,540


BVTS — 14206435 — Beaverton Creek at 216th near Orenco, Oregon [RM 1.2]

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DCBR – 14206443 – DAWSON CREEK AT BROOKWOOD ROAD [RM 0.7]Latitude: 45 31 27 Longitude:122 56 01 Source Agency: District 18 Watermaster


JAN* FEB* MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 1 12.6 5.36 4.93 8.58 1.21 .67 .23 1.59 .32 .70 4.98 2 r 18.7 4.53 4.84 4.76 1.04 .60 .80 .87 .31 1.30 5.30 3 r 18.2 5.44 6.06 4.43 .97 .56 1.20 .30 .29 1.53 10.8 4 26.5 4.28 6.87 5.40 1.15 .52 .46 .30 .28 1.01 5.84 5 9.97 3.98 5.01 3.68 .94 .52 .70 .53 .27 .92 24.4 6 6.41 4.82 6.17 3.29 .88 .59 .75 .49 1.03 .84 14.8 7 5.22 r 27.7 6.08 3.10 1.41 .60 .58 .59 2.10 .93 7.65 8 4.64 14.4 5.34 3.05 .94 .59 4.12 .90 .98 1.13 4.27 9 4.19 25.7 4.97 2.80 .81 .60 2.11 6.48 r 13.0 .96 3.41

10 3.78 8.98 5.19 2.73 .97 .54 1.03 2.56 r 12.8 .81 6.5711 4.73 7.00 5.80 2.95 .85 .55 .78 1.24 5.04 1.05 4.4212 r 28.0 12.7 r 25.3 2.49 .79 .77 .85 .89 3.68 1.04 4.9613 18.1 13.1 r 46.8 1.98 .90 1.42 .73 .62 1.98 .93 r 46.514 11.4 9.77 11.6 1.79 .90 .64 .55 .50 1.83 .76 r 45.215 6.04 9.00 7.20 2.29 .88 .51 .53 .44 2.76 1.22 10.716 4.87 6.98 5.89 3.61 .80 .49 1.11 1.71 3.78 8.83 5.6817 4.26 7.48 8.16 3.02 1.08 .48 1.58 1.26 1.85 6.03 4.9518 3.86 7.04 5.52 2.39 .90 .42 1.27 .90 1.29 2.76 3.5319 3.55 8.78 4.64 2.39 .91 .89 .52 .85 3.95 r 34.7 3.0420 3.31 8.14 4.25 2.04 .79 .60 .40 .48 2.22 7.01 4.0621 3.02 15.7 6.80 1.53 .83 .45 .38 .34 1.36 2.77 5.6722 11.3 25.1 4.53 1.31 .87 .67 1.01 .32 1.24 1.87 3.2423 6.93 9.51 14.5 1.26 .83 .41 1.58 .35 1.55 1.64 2.8924 8.17 7.08 14.2 1.24 .75 .36 1.54 .34 1.23 2.50 r 23.325 5.69 6.30 7.92 2.21 .67 .94 1.18 .36 1.01 16.6 r 27.226 14.8 4.61 8.57 7.20 2.13 .65 .54 .47 .82 .98 4.85 6.9627 7.01 4.38 6.03 5.15 1.97 .65 .47 .41 1.42 .92 2.39 19.728 5.39 4.81 5.40 4.03 1.18 .59 .31 .50 1.48 .92 4.97 24.529 — 4.35 7.00 1.03 .56 .31 .44 1.11 1.50 19.1 r 28.530 — 4.40 19.0 2.29 .55 .63 1.16 .55 1.44 4.62 7.1331 — 4.27 — 1.67 — .26 1.61 — .94 — 7.34

TOTAL 260.64 13.80 291.89 270.95 84.59 26.07 17.91 30.58 30.59 72.85 135.77 377.49MEAN 9.31 4.60 9.42 9.03 2.73 .87 .58 .99 1.02 2.35 4.53 12.2MAX 28.0 4.81 27.7 46.8 8.58 1.41 1.42 4.12 6.48 13.0 34.7 46.5MIN 3.02 4.38 3.98 4.03 1.03 .55 .26 .23 .30 .27 .70 2.89AC-FT 517 27 579 537 168 52 36 61 61 144 269 749YEAR 2003* TOTAL=1,613.13 MEAN=4.79 MAX=46.8 MIN=.23 AC-FT=3,200


DCBR — 14206443 — Dawson Creek at Brookwood Road near Hillsboro, Oregon [RM 0.7]

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RCTV – 14206450 – ROCK CREEK AT HWY 8 NEAR HILLSBORO, OREGON [RM 1.2]



JAN* FEB* MAR* APR* MAY JUN* JUL AUG* SEP OCT NOV DEC* 1 r r 77.2 297 271 22.9 13.2 10.4 11.0 11.9 17.7 112 2 r 408 r 61.1 226 125 21.1 13.2 10.9 10.0 13.6 17.0 92.9 3 r r 78.5 160 96.0 20.2 13.2 11.8 10.6 10.9 22.0 170 4 r r 61.8 181 127 19.6 13.5 10.4 10.8 19.3 104 5 r r 53.3 126 96.8 18.3 14.1 9.80 11.4 19.9 256 6 r r 63.9 139 72.3 17.1 14.3 9.08 13.3 19.7 283 7 r r 282 137 62.1 18.0 14.5 10.2 57.4 17.2 178 8 r r 407 149 71.0 17.7 14.6 26.5 27.8 18.2 138 9 r 434 r 399 130 58.6 17.0 13.9 107 41.9 19.1 85.3

10 346 332 406 110 49.8 17.3 13.8 90.6 151 19.2 11911 234 194 353 115 45.3 13.4 24.1 65.0 18.8 12812 301 77.9 363 283 41.0 13.4 16.2 16.3 93.2 27.2 13313 360 57.0 412 r 37.8 14.5 14.6 13.2 46.9 22.8 25714 329 52.2 429 r 34.3 13.3 12.8 12.1 23.7 19.7 r15 247 81.2 426 300 32.2 12.5 12.0 10.4 30.5 19.4 r 43816 178 171 410 222 40.8 12.8 13.1 21.4 72.1 73.8 25217 119 r 317 388 224 53.5 17.3 11.3 14.5 29.8 40.7 139 18918 86.5 r 358 176 49.7 16.6 11.3 13.2 16.8 19.9 66.0 11819 73.0 r 318 111 33.7 16.4 11.3 13.3 13.0 50.6 220 81.720 64.5 376 301 92.4 28.9 16.6 11.5 11.2 10.8 58.6 304 86.521 59.1 352 278 129 27.2 19.2 10.7 9.97 10.2 21.2 117 16122 140 320 389 106 25.6 19.2 11.6 10.8 9.67 16.9 56.3 11023 201 270 435 115 25.2 17.7 11.1 12.1 9.89 23.2 34.0 76.324 162 203 r 288 24.8 17.2 10.3 12.5 10.4 23.3 47.1 19225 152 122 r 201 25.4 16.4 9.97 11.6 10.5 16.4 122 34126 240 76.7 r 176 25.3 16.3 10.6 10.6 10.7 14.6 128 23927 285 66.0 r 130 24.2 15.4 10.8 11.6 11.6 15.5 62.9 20728 242 62.2 r 102 22.4 15.3 10.9 10.4 12.3 17.5 44.9 33029 285 — r 106 21.2 14.8 10.3 9.79 11.6 23.5 245 41430 r — r 325 29.4 13.6 10.4 10.3 11.1 29.1 180 37431 r — 380 — 25.8 — 12.2 11.1 — 23.2 — 258

TOTAL 4,946.1 3,130.2 7,129.8 4,856.4 1,703.3 421.2 382.47 274.76 571.04 1,075.6 2,137.2 5,923.7MEAN 225 184 297 173 54.9 17.6 12.3 11.9 19.0 34.7 71.2 197MAX 434 376 435 325 271 22.9 14.6 16.2 107 151 304 438MIN 59.1 52.2 53.3 92.4 21.2 13.6 9.97 9.79 9.08 10.8 17.0 76.3AC-FT 9,810 6,210 14,140 9,630 3,380 835 759 545 1,130 2,130 4,240 11,750YEAR 2003* TOTAL=32,551.77 MEAN=101 MAX=438 MIN=9.08 AC-FT=64,570


RCTV — 14206450 — Rock Creek at Hwy 8 near Hillsboro, Oregon [RM 1.2]

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FRMO – 14206500 – TUALATIN RIVER AT FARMINGTON, OREGON [RM 33.3]Latitude: 45 26 58 Longitude: 122 57 02 Source Agency: District 18 Watermaster


JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 1 3,240 5,800 1,210 2,920 1,560 252 173 142 169 174 218 829 2 3,170 7,300 1,130 2,580 1,250 243 163 145 170 184 203 705 3 3,380 7,980 1,050 2,240 1,070 220 144 154 160 191 208 694 4 3,570 7,580 979 2,070 1,020 219 151 176 149 194 220 726 5 3,740 6,790 901 1,950 1,010 226 153 169 144 184 197 888 6 3,790 5,860 865 1,850 946 220 161 183 149 194 185 1,230 7 3,800 5,020 1,290 1,850 877 214 167 190 158 227 178 1,410 8 3,690 4,230 2,250 1,860 836 207 162 227 192 238 172 1,400 9 3,460 3,630 2,710 1,830 807 226 151 316 263 219 173 1,220

10 3,120 3,120 2,980 1,730 743 220 148 239 346 342 175 1,06011 2,680 2,550 3,020 1,630 687 211 145 220 269 291 174 1,02012 2,380 1,950 3,050 1,750 650 205 152 201 222 281 174 98213 2,530 1,510 3,160 2,400 611 207 155 182 189 276 185 1,20014 2,600 1,280 3,270 2,850 561 226 164 166 181 280 184 2,25015 2,500 1,170 3,310 2,700 520 238 161 164 178 233 184 2,72016 2,280 1,310 3,290 2,440 505 228 149 160 177 243 206 2,52017 2,010 1,710 3,210 2,190 535 204 140 170 197 238 345 2,27018 1,720 2,800 3,090 1,970 539 182 144 180 184 223 528 1,95019 1,490 3,170 2,930 1,680 492 184 146 170 175 221 664 1,61020 1,310 3,120 2,800 1,450 446 191 146 155 162 254 999 1,35021 1,170 3,050 2,680 1,350 417 194 148 158 156 220 867 1,27022 1,130 2,940 2,910 1,310 398 195 143 156 161 203 619 1,17023 1,410 2,760 3,240 1,200 376 210 132 158 158 208 441 1,01024 1,640 2,500 3,460 1,460 368 201 137 173 160 217 346 1,05025 1,770 2,150 3,740 1,620 353 178 138 182 163 209 370 1,63026 1,960 1,770 4,000 1,560 348 162 133 174 165 194 608 1,93027 2,330 1,490 4,170 1,470 327 151 140 166 168 188 756 1,86028 2,510 1,310 4,100 1,370 304 163 150 162 169 194 671 2,09029 2,630 — 3,850 1,300 265 162 143 156 176 197 753 2,54030 3,060 — 3,570 1,530 258 166 127 161 177 216 941 2,73031 4,060 — 3,260 — 258 — 134 166 — 224 — 2,530

TOTAL 80,130 95,850 85,475 56,110 19,337 6,105 4,600 5,521 5,487 6,957 11,944 47,844MEAN 2,585 3,423 2,757 1,870 624 204 148 178 183 224 398 1,543MAX 4,060 7,980 4,170 2,920 1,560 252 173 316 346 342 999 2,730MIN 1,130 1,170 865 1,200 258 151 127 142 144 174 172 694AC-FT 158,900 190,100 169,500 111,300 38,350 12,110 9,120 10,950 10,880 13,800 23,690 94,900YEAR 2003 TOTAL=425,360.00 MEAN=1,165 MAX=7,980 MIN=127 AC-FT=843,700

FRMO — 14206500 — Tualatin River at Farmington, Oregon [RM 33.3]

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CCER – 14206748 – CEDAR CREEK AT EDY ROAD NEAR SHERWOOD, OREGON [RM 0.62]Latitude: 45 22 05 Longitude: 122 51 22 Source Agency: District 18 Watermaster


JAN* FEB* MAR* APR MAY* JUN* JUL* AUG* SEP* OCT* NOV DEC* 1 r 63.6 r 13.1 16.1 14.1 7.00 16.0 2 r 59.0 r 10.8 18.2 11.8 7.89 15.2 3 r 66.5 r 63.1 11.4 20.2 10.4 8.08 20.7 4 r 65.5 51.9 9.10 15.0 12.9 8.05 17.4 5 53.4 41.4 8.44 15.3 8.81 8.09 34.7 6 43.9 32.8 11.2 26.2 7.13 7.91 29.0 7 34.5 26.6 r 24.8 6.06 7.76 8.05 42.3 8 27.1 22.2 63.5 23.1 6.69 4.80 8.69 25.4 9 21.5 18.5 r 24.3 5.06 5.97 8.67 21.9

10 17.4 15.5 r 67.5 20.0 4.62 6.02 8.54 24.511 15.9 13.3 56.1 17.2 4.31 7.12 8.42 21.312 27.9 11.7 50.5 42.6 4.65 12.1 7.73 31.713 25.5 10.6 46.5 r 64.5 4.15 5.96 6.11 59.314 26.3 9.34 46.8 51.6 4.14 6.75 6.8015 22.8 13.9 40.6 41.7 10.3 9.05 53.216 20.7 22.1 37.8 32.9 10.0 15.0 41.117 17.8 r 62.6 30.5 29.1 6.98 11.5 31.418 15.3 r 27.1 21.5 6.43 14.6 24.219 13.1 r 62.8 28.8 16.7 12.3 r 43.3 21.020 11.3 50.5 27.7 14.3 8.57 20.2 21.321 10.0 43.3 39.2 20.3 7.04 14.3 22.822 19.6 35.1 59.6 13.2 7.05 11.1 18.323 13.8 29.1 55.9 23.6 7.97 9.98 17.724 20.0 25.1 47.0 33.6 6.52 11.7 36.325 18.4 21.1 40.1 30.0 6.08 19.9 61.426 49.4 18.3 42.4 36.1 6.12 17.1 43.627 46.4 15.5 30.1 26.9 6.01 12.7 63.828 38.7 14.5 25.5 23.1 5.68 13.729 r 49.6 — 21.9 23.7 7.42 40.930 r — 18.9 19.4 7.66 17.5 58.131 r — 17.2 — — — 6.68 — 52.2

TOTAL 914.9 730.84 985.24 785.2 104.82 185.29 392.56 925.8MEAN 31.5 29.2 34.0 26.2 7.49 7.41 13.1 33.1MAX 66.5 63.1 67.5 64.5 14.1 12.3 43.3 63.8MIN 10.0 9.34 8.44 13.2 4.14 4.80 6.11 15.2AC-FT 1,810 1,450 1,950 1,560 208 368 779 1,840YEAR 2003* TOTAL=5,024.65 MEAN=23.9 MAX=67.5 MIN=4.14 AC-FT=9,970*Incomplete record; r = At least one measurement of flow & stage exceeded rating curve (an estimate of mean daily flow was calculated if possible)

CCER — 14206748 — Cedar Creek at Edy Road near Sherwood, Oregon [RM 0.62]

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CCSR – 14206750 – CHICKEN CREEK AT SCHOLLS-SHERWOOD RD NEAR SHERWOOD, OREGON [RM 2.3]Latitude: 45 22 31 Longitude: 122 51 24 Source Agency: District 18 Watermaster


JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 1 108 355 26.2 30.2 28.3 8.31 3.19 .88 1.50 2.62 3.06 16.9 2 91.6 214 23.7 31.3 26.1 7.57 3.12 1.34 1.61 2.87 4.19 14.7 3 134 122 24.3 33.2 24.3 7.43 3.17 1.70 1.54 3.07 4.48 23.3 4 117 76.6 21.9 28.9 26.6 6.96 3.30 1.53 1.47 2.10 3.94 18.4 5 73.2 55.5 20.8 28.3 22.3 6.58 3.62 1.47 1.51 2.26 3.92 38.2 6 52.4 45.8 22.4 37.4 20.1 6.28 4.14 1.68 1.60 3.08 3.89 35.1 7 42.2 39.7 160 37.2 18.7 6.22 3.50 1.54 4.17 6.21 3.84 44.5 8 35.7 35.2 116 36.0 19.8 6.50 3.51 15.7 4.73 3.93 5.22 33.1 9 30.8 31.3 198 36.8 17.4 6.36 3.42 3.95 9.62 5.88 4.42 28.2

10 26.8 28.2 151 33.6 15.8 6.33 2.91 2.57 4.19 6.43 4.06 30.911 24.9 26.0 92.5 30.9 15.3 6.07 2.69 1.95 2.93 6.84 4.73 26.712 33.4 24.1 72.8 50.3 15.3 5.71 2.52 1.86 2.39 11.2 4.24 37.013 31.7 22.7 63.8 113 14.3 6.71 3.29 1.65 1.98 6.29 3.99 12414 33.0 21.0 64.0 71.5 13.8 6.20 2.60 1.52 1.94 5.00 4.12 17915 30.9 24.8 55.3 55.1 14.6 6.09 2.38 1.44 1.67 6.13 7.04 78.716 29.0 31.5 50.6 46.5 15.8 5.36 2.49 1.33 2.64 6.22 15.6 50.717 26.5 136 44.1 42.4 19.0 4.96 2.57 1.41 2.26 4.11 10.6 41.818 24.2 234 40.3 36.2 16.4 4.92 2.29 1.49 2.00 3.33 14.6 34.519 22.1 116 41.0 31.6 13.7 5.42 2.26 1.37 1.82 9.08 50.4 30.220 20.1 71.0 39.7 29.1 12.8 6.00 2.27 1.36 1.79 5.06 23.8 29.321 18.8 56.9 47.9 33.6 12.2 6.39 2.08 1.50 1.76 3.82 15.1 31.222 26.1 47.9 95.8 27.2 11.7 6.49 1.54 1.61 1.71 4.07 9.53 25.323 22.2 42.6 85.4 34.9 11.1 5.53 1.35 1.71 1.98 5.14 7.48 24.524 26.8 38.5 64.1 43.9 10.7 4.82 1.24 1.79 2.08 4.07 10.6 42.025 26.3 34.8 53.5 41.1 10.6 4.08 1.17 1.39 2.19 3.67 19.8 99.426 55.3 32.0 55.4 45.3 10.1 3.95 1.47 1.47 2.03 4.31 17.8 55.327 51.7 29.0 43.5 39.3 9.59 3.46 1.47 1.52 1.98 4.42 11.2 10728 44.6 27.7 39.3 36.4 9.09 3.29 1.19 1.42 1.87 4.26 11.5 13629 63.6 — 35.9 36.3 8.51 3.73 1.00 1.47 2.11 5.32 40.3 18330 204 — 33.2 32.8 9.13 3.69 .88 1.36 2.54 5.05 19.8 97.931 r 385 — 31.5 — 9.04 — .83 1.72 — 3.13 — 70.5

TOTAL 1,911.9 2,019.8 1,913.9 1,210.3 482.16 171.41 73.46 64.70 73.61 148.97 343.25 1,787.3MEAN 61.7 72.1 61.7 40.3 15.6 5.71 2.37 2.09 2.45 4.81 11.4 57.7MAX 385 355 198 113 28.3 8.31 4.14 15.7 9.62 11.2 50.4 183MIN 18.8 21.0 20.8 27.2 8.51 3.29 .83 .88 1.47 2.10 3.06 14.7AC-FT 3,790 4,010 3,800 2,400 956 340 146 128 146 295 681 3,550YEAR 2003 TOTAL=10,200.76 MEAN=27.9 MAX=385 MIN=.83 AC-FT=20,230

r = At least one measurement of flow & stage exceeded rating curve (an estimate of mean daily flow was calculated if possible)

CCSR — 14206750 — Chicken Creek at Scholls-Sherwood Road near Sherwood, Oregon [RM 2.3]

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UNITED STATES DEPARTMENT OF THE INTERIOR – GEOLOGICAL SURVEY – OREGON DISTRICTSTATION NUMBER 14206900 FANNO CREEK AT 56TH AVENUE

LATITUDE: 452917 LONGITUDE: 1224401 DRAINAGE AREA: 2.37


1 4.5 14 1.1 2.9 3.0 0.98 0.35 0.22 0.24 0.20 0.20 4.42 18 6.0 1.4 2.7 2.6 1.0 0.38 0.23 0.22 0.26 0.24 6.23 8.9 4.6 1.3 3.7 2.9 0.99 0.40 0.24 0.26 0.20 0.24 4.74 17 3.7 0.92 1.8 3.7 0.93 0.37 0.25 0.29 0.19 0.24 7.65 4.2 3.1 0.98 3.8 2.3 0.87 0.33 0.26 0.24 0.19 0.24 206 3.0 2.6 3.0 6.5 1.9 0.80 0.35 0.21 0.24 1.9 0.21 7.87 2.4 2.4 28 5.9 4.5 0.77 0.41 0.21 2.2 0.47 0.28 118 2.0 2.2 9.3 2.3 5.3 0.71 0.48 0.29 0.62 0.27 0.45 3.69 2.0 2.0 17 3.3 2.0 0.74 0.41 0.39 5.9 3.9 0.29 3.5

10 1.7 1.9 4.6 3.2 1.7 0.75 0.41 0.25 0.31 0.87 0.32 7.311 3.1 2.1 2.8 1.8 1.6 0.75 0.48 0.23 0.23 2.0 0.58 5.212 11 1.7 8.2 18 1.5 0.70 0.48 0.22 0.22 0.65 0.26 5.913 8.5 1.7 7.2 32 1.4 1.5 0.39 0.23 0.21 0.24 0.22 4814 4.8 1.6 6.5 6.4 1.3 0.71 0.30 0.22 0.21 0.46 0.22 1615 2.8 7.9 4.1 4.2 1.5 0.66 0.32 0.21 0.21 1.4 1.5 4.716 2.3 10 3.6 3.6 3.8 0.68 0.32 0.25 1.3 1.1 4.4 4.217 2.0 42 2.2 13 7.1 0.58 0.30 0.26 0.23 0.19 0.95 2.618 1.8 12 1.9 3.8 2.5 e0.50 0.27 0.33 0.19 0.18 1.8 1.819 1.6 6.7 4.7 3.1 1.7 e0.40 0.26 0.33 0.23 2.1 24 1.820 1.5 4.3 1.9 2.7 1.6 0.59 0.24 0.27 0.20 0.29 7.2 5.621 1.4 3.8 8.1 5.3 1.5 0.87 0.27 0.27 0.19 0.31 2.8 5.822 7.9 2.8 12 2.5 1.4 0.55 0.24 0.32 0.21 0.73 1.5 2.323 2.1 2.3 5.8 13 1.4 0.48 0.22 0.26 0.19 0.44 2.0 2.024 3.6 1.9 2.9 6.9 1.5 0.37 0.20 0.25 0.20 0.23 3.1 1325 4.4 1.7 2.9 6.3 1.3 0.36 0.23 0.24 0.16 0.23 7.5 1326 12 1.7 11 4.9 1.2 0.35 0.23 0.26 0.19 0.22 4.0 3.527 3.9 1.2 2.9 3.2 1.1 0.34 0.23 0.29 0.18 0.23 1.9 1428 2.6 1.4 2.3 3.2 1.1 0.30 0.23 0.28 0.16 0.28 7.5 1829 20 — 2.0 5.2 1.3 0.30 0.24 0.28 0.20 0.35 19 1730 33 — 1.8 10 1.3 0.31 0.21 0.25 0.20 0.28 4.0 4.631 95 — 2.1 — 1.00 — 0.21 0.25 — 0.19 — 8.0

TOTAL 289.0 149.3 164.50 185.2 68.00 19.84 9.76 8.05 15.63 20.55 97.14 273.1MEAN 9.32 5.33 5.31 6.17 2.19 0.66 0.31 0.26 0.52 0.66 3.24 8.81MAX 95 42 28 32 7.1 1.5 0.48 0.39 5.9 3.9 24 48MIN 1.4 1.2 0.92 1.8 1.0 0.30 0.20 0.21 0.16 0.18 0.20 1.8AC-FT 573 296 326 367 135 39 19 16 31 41 193 542YEAR 2003 TOTAL=1300.07 MEAN=3.56 MAX=95 MIN=0.16 AC-FT 2580

†Provisional data–subject to revision; e=estimated

6900 — 14206900 — Fanno Creek at 56th Avenue [RM 11.9]

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SCRL – 14206905 – SYLVAN CREEK AT RAIEIGHWOOD LN NEAR WEST SLOPE, OREGON [RM 1.0]Latitude: 45 29 35 Longitude: 122 44 48 Source Agency: District 18 Watermaster


JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 1 2.15 8.80 1.42 1.74 1.91 .50 .64 .89 1.02 .55 .29 1.10 2 5.98 5.89 1.52 1.69 1.59 .49 .62 .89 1.03 .54 .29 2.15 3 3.16 4.06 1.45 2.11 1.56 .50 .65 .89 1.24 .52 .29 1.41 4 4.92 3.54 1.35 1.44 1.75 .50 .64 .87 .97 .52 .29 2.73 5 1.78 3.22 1.44 1.59 1.25 .54 .65 .79 .97 .51 .29 8.27 6 1.29 2.96 1.99 2.21 1.12 .50 .68 .74 .93 2.14 .29 2.17 7 1.07 2.77 9.45 2.21 1.41 .58 .85 .76 3.53 .82 .30 2.36 8 .93 2.60 4.06 1.54 1.33 .59 1.00 1.50 2.41 .64 .31 .84 9 .83 2.47 6.64 1.65 .97 .61 .88 1.11 8.70 4.38 .30 .90

10 .76 2.37 2.79 1.55 .88 .60 .94 .87 2.98 2.20 .32 1.6511 1.06 2.29 2.13 1.28 .85 .60 .77 .92 2.66 4.06 .40 1.5712 3.38 2.23 3.45 6.58 .81 .61 .84 .95 2.24 2.22 .30 1.6213 2.31 2.17 3.42 9.44 .76 .68 .82 .90 2.04 1.37 .30 19.114 1.54 2.08 3.17 2.63 .73 .58 .86 .89 1.86 1.53 .30 6.8315 1.02 3.41 2.36 1.96 .69 .56 .80 .89 1.86 2.97 .69 1.9216 .85 4.11 1.88 1.78 1.27 .55 .80 .93 5.17 3.18 1.81 1.4317 .76 10.6 1.63 5.25 1.72 .55 .79 .91 2.43 1.37 .45 .9418 .74 4.59 1.46 2.07 .81 .56 .77 .90 1.96 1.13 .60 .7619 .66 3.03 2.02 1.66 .70 .59 .78 .96 1.09 3.48 8.83 .6920 .62 2.50 1.48 1.48 .66 .60 .77 .88 1.09 1.22 1.74 2.0021 .60 2.24 3.03 2.14 .64 .63 .78 .89 1.17 1.06 .70 2.0522 1.87 2.02 4.80 1.33 .62 .63 .74 .92 1.21 1.29 .43 .8323 .79 1.86 2.61 4.85 .60 .64 .77 .83 1.21 1.26 .46 .7024 1.06 1.71 1.84 2.83 .66 .63 .76 .83 1.09 .83 .61 3.8625 1.13 1.62 1.84 2.69 .64 .60 .82 .84 .99 .76 2.00 4.1926 3.18 1.55 3.54 2.10 .57 .59 .76 .87 .96 .59 .61 1.4127 1.25 1.45 1.96 1.65 .55 .58 .77 .92 1.10 .32 .44 4.6428 .98 1.53 1.55 1.55 .53 .59 .73 1.12 .81 .31 2.59 6.9429 5.74 — 1.38 3.86 .52 .59 .76 .88 .59 .34 6.34 6.1230 10.0 — 1.28 6.01 .52 .66 .84 .84 .56 .29 .98 2.2031 r 28.9 — 1.29 — .51 — .88 .87 — .29 — 2.64

TOTAL 91.31 89.67 80.23 80.87 29.13 17.43 24.16 28.25 55.87 42.69 33.55 96.02MEAN 2.95 3.20 2.59 2.70 .94 .58 .78 .91 1.86 1.38 1.12 3.10MAX 28.9 10.6 9.45 9.44 1.91 .68 1.00 1.50 8.70 4.38 8.83 19.1MIN .60 1.45 1.28 1.28 .51 .49 .62 .74 .56 .29 .29 .69AC-FT 181 178 159 160 58 35 48 56 111 85 67 190YEAR 2003 TOTAL=669.18 MEAN=1.83 MAX=28.9 MIN=.29 AC-FT=1,330r = At least one measurement of flow & stage exceeded rating curve (an estimate of mean daily flow was calculated if possible)

SCRL — 14206905 — Sylvan Creek at Raleighwood Lane near West Slope, Oregon [RM 1.0]

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ASMP – 14206933 – ASH CREEK AT METZGER PARK AT METZGER, OREGON [RM 1.25]Latitude: 45 27 00 Longitude: 122 45 45 Source Agency: District 18 Watermaster


JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 1 7.10 15.3 2.41 4.02 4.58 1.18 .41 .21 .12 .16 .54 2.72 2 18.3 7.65 2.54 4.01 3.72 1.42 .41 .20 .11 .17 .55 3.37 3 11.0 5.72 3.22 5.40 3.45 1.24 .41 .21 .10 .16 .55 4.18 4 15.0 4.50 2.30 3.96 4.13 1.08 .42 .21 .14 .16 .48 4.28 5 5.94 3.83 2.20 4.03 2.80 1.20 .40 .25 .14 .16 .50 12.4 6 4.47 3.27 3.82 6.77 2.45 1.00 .40 .23 .15 1.45 .39 7.17 7 3.46 2.90 29.9 4.88 2.61 .94 .40 .19 1.85 .69 .52 7.72 8 2.94 2.60 11.7 3.71 3.90 .95 .38 .83 .94 .50 .67 2.89 9 2.50 2.30 17.8 4.30 2.27 1.09 .39 .25 6.10 2.95 .60 3.02

10 2.22 2.09 8.61 3.89 2.05 .91 .39 .21 .64 .97 .64 4.7911 2.96 1.94 6.17 2.95 1.92 .85 .35 .20 .41 2.23 .72 3.1912 9.32 1.77 9.01 16.9 1.93 .87 .32 .21 .30 2.06 .44 4.6113 7.38 1.78 9.76 r 25.0 2.16 1.69 .32 .19 .26 .59 .46 46.314 5.61 1.63 8.90 8.34 2.11 .90 .26 .18 .26 .98 .42 16.615 3.94 5.21 6.65 5.47 2.26 .77 .24 .18 .25 1.58 1.74 5.5816 3.14 7.95 6.46 4.47 5.70 .64 .23 .19 .89 1.34 3.80 4.4917 2.65 r 34.0 4.82 9.45 8.25 .65 .23 .19 .33 .46 .99 3.3018 2.35 14.9 4.04 4.39 3.54 .62 .21 .19 .21 .38 2.11 2.5719 2.12 7.84 6.10 3.52 2.59 .58 .19 .18 .29 2.25 20.4 2.3120 1.87 5.27 4.32 3.06 2.17 .63 .19 .15 .21 .51 4.17 4.8121 1.71 4.73 7.53 6.02 2.34 .87 .19 .11 .21 .46 2.12 4.8722 6.33 3.84 14.5 3.14 2.02 .63 .20 .15 .22 .76 1.37 2.7623 3.04 3.40 6.58 10.9 1.79 .72 .17 .14 .24 .68 1.10 2.3624 4.17 3.99 4.97 7.47 1.77 .57 .19 .12 .25 .40 1.64 11.025 4.35 3.04 4.44 6.96 1.72 .45 .19 .11 .48 .39 3.42 12.226 10.3 2.41 9.00 6.18 1.58 .40 .23 .13 .80 .40 2.27 4.1727 4.53 2.12 5.56 4.35 1.63 .40 .22 .13 .76 .38 1.10 14.528 3.41 2.60 4.19 4.04 1.67 .38 .21 .14 .68 .46 3.24 15.729 17.7 — 3.49 5.32 1.39 .42 .20 .13 .63 1.66 14.5 21.630 33.0 — 3.12 11.6 1.29 .43 .18 .13 .19 .56 2.72 6.7531 r 75.0 — 3.17 — 1.24 — .22 .11 — .43 — 8.80

TOTAL 277.81 158.58 217.28 194.50 83.03 24.48 8.75 6.05 18.16 26.33 74.17 251.01MEAN 8.96 5.66 7.01 6.48 2.68 .82 .28 .20 .61 .85 2.47 8.10MAX 75.0 34.0 29.9 25.0 8.25 1.69 .42 .83 6.10 2.95 20.4 46.3MIN 1.71 1.63 2.20 2.95 1.24 .38 .17 .11 .10 .16 .39 2.31AC-FT 551 315 431 386 165 49 17 12 36 52 147 498YEAR 2003 TOTAL=1,340.15 MEAN=3.67 MAX=75.0 MIN=.10 AC-FT=2,660


ASMP — 14206933 — Ash Creek at Metzger Park at Metzger, Oregon [RM 1.25]

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SC121 – 14206938 – SUMMER CREEK AT SW 121ST AVE NEAR TIGARD, OREGON [RM 1.0]Latitude: 45 26 06 Longitude: 122 47 55 Source Agency: District 18 Watermaster


JAN* FEB MAR APR* MAY JUN JUL AUG SEP OCT NOV DEC 1 26.4 89.5 5.85 7.61 15.8 4.79 1.75 1.02 .63 .41 .60 9.34 2 r 67.0 30.6 4.15 10.7 6.49 1.69 1.25 .68 .49 .57 7.48 3 66.0 19.7 7.00 10.2 6.51 1.58 1.28 .63 .47 .57 25.3 4 76.6 14.1 4.52 10.3 4.55 1.45 1.39 .77 .61 .53 13.7 5 22.7 11.4 3.92 6.07 2.97 1.25 1.26 .66 .71 .59 54.9 6 14.7 9.46 6.56 6.02 2.35 1.33 1.32 .77 2.90 .53 36.9 7 10.9 7.94 108 5.24 2.34 1.20 1.10 3.21 5.02 .48 29.5 8 8.59 6.86 33.6 8.44 2.69 1.02 61.6 4.82 1.60 .65 9.12 9 6.79 6.20 69.3 3.94 3.00 1.21 3.47 44.3 15.6 .61 7.49

10 3.61 5.33 22.9 3.41 3.43 1.28 2.17 2.86 4.32 1.10 12.111 6.51 4.91 15.4 4.17 2.86 1.30 1.64 1.81 6.34 .60 7.3012 40.7 4.45 22.7 3.59 2.79 1.21 1.49 1.24 7.16 .50 11.313 26.4 4.10 27.4 2.62 4.29 1.22 1.35 1.09 3.45 .55 16614 19.1 3.77 26.1 2.34 3.18 1.21 1.18 .98 3.62 .62 99.215 10.8 9.20 16.4 2.46 2.63 1.23 1.03 .86 4.31 2.48 16.616 8.51 18.4 15.7 11.3 10.8 2.70 1.15 1.00 1.68 4.36 12.6 13.617 6.94 147 14.0 14.6 7.57 2.72 1.11 1.10 1.01 2.09 4.32 10.718 5.68 55.6 10.1 8.72 6.26 2.58 1.04 1.04 .82 1.53 7.09 6.8019 4.80 25.0 14.4 6.64 4.60 2.58 .99 .96 .75 7.76 r 108 5.5820 4.10 16.6 11.2 6.15 4.65 5.40 1.15 .76 .73 2.14 15.7 9.4421 3.71 13.7 28.5 12.5 4.79 4.39 1.12 .83 .63 1.36 7.13 16.522 17.2 11.3 82.0 5.61 4.75 3.52 1.09 .85 .68 1.35 4.09 7.2423 8.44 7.74 22.0 23.6 4.67 3.31 1.16 .78 .66 2.03 3.07 5.9424 9.87 6.55 13.3 17.5 4.83 2.41 1.12 .76 .67 1.19 4.51 29.625 8.30 5.53 11.4 12.0 5.06 2.04 1.22 .82 .59 .93 7.97 52.026 33.6 4.89 16.4 12.1 4.33 1.93 1.19 .80 1.22 .87 6.53 11.327 11.7 4.18 13.1 7.50 3.98 2.02 1.24 .92 .42 .92 3.25 50.628 8.90 5.85 9.22 6.78 4.20 1.93 1.52 .86 .46 .76 6.63 48.029 37.0 — 6.68 r 24.1 4.01 2.02 1.28 .72 .53 1.97 74.2 64.730 167 — 5.79 r 83.1 4.21 1.79 1.22 .84 .49 2.07 8.37 17.331 r — 5.36 — 3.95 — 1.11 .84 — .87 — 24.6

TOTAL 742.55 549.86 652.95 259.81 177.96 96.21 38.64 96.43 76.65 89.21 284.44 880.13MEAN 24.8 19.6 21.1 16.2 5.74 3.21 1.25 3.11 2.56 2.88 9.48 28.4MAX 167 147 108 83.1 15.8 6.51 1.75 61.6 44.3 15.6 108 166MIN 3.61 3.77 3.92 5.61 2.34 1.79 .99 .72 .42 .41 .48 5.58AC-FT 1,470 1,090 1,300 515 353 191 77 191 152 177 564 1,750YEAR 2003* TOTAL=3,944.84 MEAN=11.3 MAX=167 MIN=.41 AC-FT =7,820


SC121 — 14206938 — Summer Creek at 121st Avenue near Tigard, Oregon [RM 1.0]

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FANO – 14206950 – FANNO CREEK AT DURHAM ROAD [RM 1.2]Latitude: 45 24 12 Longitude: 122 45 18 Source Agency: District 18 Watermaster


JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 1 129 577 32.5 41.7 64.6 12.9 5.74 4.57 3.13 2.98 5.19 45.9 2 151 132 24.8 45.6 44.2 13.9 6.51 5.00 2.72 3.18 5.11 33.2 3 276 82.5 38.7 74.1 37.8 14.2 6.20 5.09 2.88 3.36 4.77 92.1 4 228 60.0 24.7 55.4 62.9 12.1 5.95 5.03 2.95 3.26 4.81 44.3 5 102 48.3 22.5 42.4 34.8 10.2 5.78 5.54 2.78 3.27 4.78 214 6 57.7 39.8 36.0 95.0 27.9 9.26 5.84 5.60 2.99 11.3 4.64 143 7 43.2 34.6 341 55.2 26.9 8.86 5.80 5.25 11.0 32.6 4.68 124 8 33.9 30.9 202 45.7 64.7 8.66 5.70 47.7 30.3 11.6 5.42 50.5 9 29.2 27.5 245 51.5 26.3 9.26 5.55 11.9 97.1 43.2 5.17 36.4

10 24.8 24.8 114 46.0 22.1 10.5 5.52 8.27 18.4 34.0 5.51 67.211 28.4 23.3 68.0 37.0 20.8 10.1 5.51 6.79 9.14 32.7 6.21 43.212 143 23.0 97.7 209 20.2 9.62 5.35 5.45 6.69 43.5 6.09 72.213 101 20.8 126 353 18.0 15.1 5.08 5.51 5.50 19.7 5.13 31714 98.3 19.4 125 152 16.8 14.6 4.99 4.71 4.69 18.2 4.78 50815 46.7 48.6 84.2 70.1 16.4 10.3 4.91 4.69 4.39 24.6 18.1 11816 35.1 111 78.8 52.6 45.5 9.64 4.86 4.84 10.9 31.5 57.5 65.917 29.4 333 63.4 109 58.0 9.14 4.61 4.68 10.3 14.2 34.0 56.718 25.9 363 46.3 55.9 47.8 8.40 4.80 4.56 5.15 8.51 35.9 34.919 23.6 113 61.8 39.0 22.8 8.58 5.07 4.12 4.45 41.6 271 29.020 21.3 73.5 62.5 33.4 19.2 14.3 4.77 4.06 3.82 15.8 135 51.221 20.3 61.9 82.8 74.2 18.1 14.5 4.43 3.60 3.61 9.07 44.4 94.622 87.5 50.7 230 35.3 17.2 11.7 4.47 4.54 3.20 8.33 22.9 39.023 51.4 39.1 100 82.9 16.2 10.4 5.28 4.26 3.30 12.6 16.3 30.024 55.4 34.2 61.8 142 15.5 9.44 5.21 4.05 3.21 8.39 26.1 12525 46.5 30.6 48.9 71.5 16.6 7.63 5.78 4.43 3.11 6.07 46.7 21026 158 27.8 102 85.1 14.8 6.65 4.93 4.41 3.13 5.06 39.3 65.227 65.5 25.7 72.1 49.2 14.1 6.14 4.80 4.92 3.83 5.06 22.5 15728 44.0 29.7 51.4 39.7 14.3 6.12 4.72 5.84 2.60 5.19 27.8 20329 137 — 37.2 60.6 14.7 6.08 5.46 4.06 2.93 11.0 248 32330 426 — 32.7 223 15.7 5.79 5.43 3.67 3.29 12.1 54.0 12031 900 — 32.7 — 14.1 — 4.52 3.59 — 6.70 — 109

TOTAL 3,619.1 2,485.7 2,746.5 2,527.1 869.0 304.07 163.57 200.73 271.49 488.63 1,171.79 3,622.5MEAN 117 88.8 88.6 84.2 28.0 10.1 5.28 6.48 9.05 15.8 39.1 117MAX 900 577 341 353 64.7 15.1 6.51 47.7 97.1 43.5 271 508MIN 20.3 19.4 22.5 33.4 14.1 5.79 4.43 3.59 2.60 2.98 4.64 29.0AC-FT 7,180 4,930 5,450 5,010 1,720 603 324 398 539 969 2,320 7,190YEAR 2003 TOTAL=18,470.18 MEAN=50.6 MAX=900 MIN=2.60 AC-FT=36,640

FANO — 14206950 — Fanno Creek at Durham Road near Tigard, Oregon [RM 1.2]

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HCWL – 14206957 – HEDGES CREEK WETLAND NEAR TUALATIN [RM 1.2]Latitude: 45 22 53 Longitude:122 46 35 Source Agency: District 18 Watermaster

DayDaily Mean Stage in Feet above Gage Datum for 2002

JAN FEB MAR APR MAY JUN JUL AUG SEP* OCT NOV DEC 1 1.87 2.04 1.54 .98 .76 .09 1.21 1.16 1.37 1.48 1.57 2 1.84 1.85 1.51 .85 .72 1.20 1.15 1.37 1.47 1.52 3 1.89 1.77 1.54 .90 .69 r 1.21 1.15 1.38 1.49 1.59 4 1.87 1.71 1.52 .82 .72 r 1.23 1.22 1.38 1.53 5 1.80 1.68 1.51 .79 .70 r 1.25 1.34 1.38 1.68 6 1.75 1.65 1.51 1.04 .65 r 1.27 1.35 1.40 1.68 7 1.72 1.63 1.79 1.00 .59 1.28 1.37 1.50 1.67 8 1.69 1.61 1.75 1.00 .62 1.40 1.41 1.49 1.61 9 1.67 1.60 1.80 1.00 .57 1.43 1.49 1.50 1.56

10 1.66 1.58 1.72 1.00 .54 1.51 1.52 1.5811 1.64 1.57 1.65 1.00 .51 1.45 1.52 1.5512 1.72 1.57 1.63 1.35 .49 1.42 1.57 1.6113 1.72 1.57 1.64 1.59 .45 1.39 1.55 1.7814 1.72 1.57 1.65 1.28 .39 1.39 1.49 1.8915 1.68 1.61 1.62 1.03 .40 1.39 1.48 1.7316 1.66 1.68 1.60 1.00 .53 1.41 1.53 1.6517 1.65 1.80 1.57 1.01 .74 1.43 1.48 1.6418 1.62 1.83 1.55 1.00 .73 1.41 1.44 1.62 1.5819 1.61 1.72 1.55 1.00 .62 1.32 1.41 1.52 1.77 1.5420 1.60 1.67 1.57 1.00 .53 1.32 1.37 1.39 1.51 1.72 1.5421 1.60 1.66 1.62 1.00 .47 1.33 1.37 1.38 1.49 1.63 1.5822 1.67 1.62 1.75 1.00 .43 1.34 1.37 1.39 1.52 1.56 1.5223 1.68 1.59 1.67 1.04 .37 1.34 1.37 1.38 1.53 1.52 1.5024 1.69 1.56 1.47 1.08 .32 1.34 1.34 1.37 1.50 1.53 1.6025 1.68 1.54 1.34 1.00 .32 1.32 1.30 1.36 1.43 1.55 1.6726 1.79 1.53 1.32 1.01 .27 1.29 1.28 1.37 1.39 1.54 1.5927 1.73 1.52 1.18 1.00 .23 1.23 1.27 1.36 1.40 1.48 1.6728 1.69 1.53 1.11 1.00 .19 1.19 1.26 1.35 1.42 1.47 1.7129 1.73 — 1.05 .89 .16 1.22 1.25 1.35 1.45 1.71 1.7930 1.89 — 1.02 .83 .15 1.23 1.22 1.36 1.50 1.60 1.6931 2.12 — 1.02 — .15 — 1.22 1.19 — 1.50 — 1.64*Incomplete record

Hedges Creek Wetland near Tualatin, Oregon

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HCTP – 14206958 – HEDGES CREEK AT TUALATIN PARK [RM 0.3]Latitude: 45 22 53 Longitude:122 46 35 Source Agency: District 18 Watermaster


JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 1 30.5 r 4.19 4.79 4.43 .93 .30 .01 0 .14 .50 7.67 2 27.5 39.6 2.92 4.83 3.23 .90 .26 .01 0 .13 .47 4.97 3 41.2 22.2 4.41 6.30 2.72 .86 .24 .01 0 .11 .46 11.4 4 35.0 18.8 3.40 4.68 4.27 .92 .25 .01 0 .10 .65 6.22 5 19.7 13.4 2.98 4.48 3.33 1.03 .26 .01 0 .09 1.52 25.5 6 11.1 7.29 2.80 9.83 2.21 1.15 .29 .01 0 .10 1.60 24.1 7 7.87 5.28 50.4 5.42 1.63 1.21 .26 .01 0 .14 1.37 22.1 8 5.97 4.47 36.7 4.85 2.64 1.13 .23 .03 .01 .75 1.10 12.5 9 4.81 3.82 50.8 4.87 1.94 1.19 .20 .04 .56 1.16 .93 7.12

10 3.98 3.24 29.3 4.69 1.65 1.20 .16 .25 1.81 2.44 1.07 9.8011 3.57 2.94 16.8 4.03 1.54 1.27 .14 .19 .94 2.33 1.16 7.1012 9.63 2.39 16.1 23.5 1.75 1.49 .13 .15 .43 4.72 .74 13.413 10.7 2.38 19.2 37.2 1.44 1.69 .11 .13 .22 3.60 .42 57.914 10.3 2.52 20.8 17.4 1.23 1.62 .10 .11 .14 1.49 .35 66.915 5.95 4.27 15.6 9.25 1.75 1.82 .10 .10 .12 1.15 .94 27.016 4.44 11.9 13.9 6.55 3.83 1.76 .09 .11 .16 1.51 6.53 16.917 3.68 44.5 8.79 8.04 8.16 1.64 .08 .09 .14 1.09 5.69 15.318 3.07 55.8 5.76 6.23 7.72 1.59 .07 .07 .18 .68 10.3 9.1019 2.46 20.5 6.30 4.09 2.16 1.08 .07 .04 .21 1.95 50.5 6.6320 1.55 13.3 7.88 3.23 1.28 1.62 .07 .01 .20 1.65 32.1 7.8821 1.76 12.7 13.3 6.15 1.53 2.21 .08 .01 .17 .89 16.3 12.122 6.29 8.92 37.9 4.29 1.32 1.73 .08 .01 .15 .96 6.46 7.1423 6.75 6.47 21.0 6.48 1.30 1.68 .07 .01 .13 1.17 3.56 5.2124 6.85 5.23 13.3 12.7 1.20 1.57 .02 .01 .11 .97 4.28 16.325 5.98 4.09 9.18 7.31 1.45 1.58 .01 .01 .06 .68 5.87 26.126 23.9 3.66 11.1 9.69 1.16 1.60 .01 .01 .01 .43 4.83 11.727 13.1 2.18 6.89 7.30 1.06 1.59 .01 .01 .04 .34 2.56 28.428 7.46 3.38 5.06 4.33 .97 1.38 .01 .01 .10 .48 2.75 32.529 15.2 — 3.94 6.43 1.00 1.26 .01 0 .12 1.00 31.5 51.430 57.3 — 3.63 8.05 1.07 .93 .01 0 .12 1.23 11.6 24.431 r — 4.14 — 1.03 — .01 0 — .63 — 18.2

TOTAL 387.57 325.23 448.47 246.99 72.00 41.63 3.73 1.47 6.13 34.11 208.11 592.94MEAN 12.9 12.0 14.5 8.23 2.32 1.39 .12 .047 .20 1.10 6.94 19.1MAX 57.3 55.8 50.8 37.2 8.16 2.21 .30 .25 1.81 4.72 50.5 66.9MIN 1.55 2.18 2.80 3.23 .97 .86 .01 0 0 .09 .35 4.97AC-FT 769 645 890 490 143 83 7.4 2.9 12 68 413 1,180YEAR 2003 TOTAL=2,368.38 MEAN=6.52 MAX=66.9 MIN=0 AC-FT=4,700


HCTP — 14206958 — Hedges Creek at Tualatin Community Park at Tualatin, Oregon [RM 0.3]

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TRT – 14206960 – TUALATIN RIVER AT TUALATIN, OREGON [RM 8.9]Latitude: 45 23 14 Longitude: 122 45 46 Source Agency: District 18 Watermaster

DayDaily Elevation in Feet above Mean Sea Level for 2002


10 107.21 107.56 107.32 105.01 103.04 101.84 101.63 102.47 102.51 102.06 101.54 103.7811 106.58 106.63 107.27 104.80 102.91 101.85 101.63 102.32 102.50 102.18 101.55 103.5912 106.17 105.62 107.24 105.18 102.81 101.92 101.63 102.23 102.31 102.17 101.55 103.6013 106.16 104.71 107.39 106.35 102.73 101.95 101.64 102.14 102.15 102.10 101.56 104.1814 106.35 104.15 107.57 106.97 102.61 101.97 101.66 102.03 102.04 102.06 101.58 106.0615 106.19 103.88 107.59 106.83 102.52 102.02 101.69 101.97 102.00 102.03 101.63 106.6316 105.86 104.09 107.54 106.36 102.52 102.03 101.67 101.92 101.99 101.92 101.76 106.4017 105.44 105.12 107.41 106.00 102.61 101.98 101.63 101.91 102.02 101.74 101.88 105.9618 104.95 107.10 107.20 105.57 102.66 101.88 101.59 102.04 102.03 101.68 102.21 105.4119 104.49 107.52 106.98 105.04 102.51 101.82 101.59 102.31 101.98 101.74 103.00 104.8120 104.12 107.42 106.80 104.56 102.39 101.85 101.59 102.39 101.93 101.74 103.41 104.3221 103.82 107.25 106.65 104.36 102.30 101.90 101.60 102.36 101.87 101.71 103.32 104.1622 103.77 107.04 107.19 104.20 102.24 101.88 101.59 102.38 101.84 101.65 102.82 103.9123 104.01 106.75 107.54 104.09 102.18 101.89 101.57 102.38 101.86 101.64 102.41 103.6124 104.47 106.36 107.68 104.46 102.15 101.92 101.55 102.41 101.86 101.64 102.17 103.6925 104.72 105.81 107.94 104.78 102.13 101.87 101.56 102.50 101.84 101.65 102.10 104.6626 105.25 105.17 108.35 104.81 102.15 101.79 101.55 102.55 101.84 101.62 102.36 105.2227 105.77 104.59 108.50 104.61 102.14 101.71 101.55 102.53 101.85 101.60 102.68 105.4328 106.10 104.20 108.53 104.37 102.09 101.67 101.58 102.52 101.86 101.59 102.76 105.8229 106.37 — 108.36 104.26 101.96 101.69 101.65 102.50 101.91 101.62 103.27 106.6830 107.50 — 108.03 104.70 101.85 101.70 101.66 102.50 101.97 101.65 103.28 106.7631 109.30 — 107.59 — 101.86 — 101.63 102.55 — 101.65 — 106.48

TRT — 14206960 — Tualatin River at Tualatin, Oregon [RM 8.9]

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UNITED STATES DEPARTMENT OF THE INTERIOR - GEOLOGICAL SURVEY - OREGON DISTRICT STATION NUMBER: 14207500 TUALATIN RIVER AT WEST LINN,OREG.


Discharge, Cubic Feet per Second, Calendar Year January to December 2003 Daily Mean ValuesDay JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC1 4460 6840 1580 3970 2110 378 208 140 172 217 270 11002 4380 6650 1450 3490 1810 364 214 146 179 214 266 9493 4700 7050 1380 3090 1500 352 198 155 192 222 253 9564 4830 7380 1280 2750 1400 330 185 173 260 229 259 9125 4880 7280 1180 2560 1340 327 182 196 219 234 266 12206 4830 6840 1120 2500 1260 320 183 200 178 239 247 15207 4790 6260 1860 2400 1160 314 196 212 177 287 232 17408 4710 5650 2910 2400 1140 310 200 261 218 339 224 17709 4500 5060 3900 2380 1070 311 193 330 321 337 217 1590

10 4130 4410 4190 2290 1010 328 180 340 403 381 217 143011 3580 3610 4140 2140 933 311 171 296 398 437 220 131012 3250 2790 4090 2390 869 301 173 269 335 436 217 132013 3180 2110 4220 3300 833 313 177 245 285 410 216 170014 3340 1700 4380 3850 766 322 182 219 247 383 225 295015 3230 1510 4410 3760 717 336 192 202 234 370 245 336016 2970 1630 4360 3360 708 331 187 194 234 374 306 321017 2640 2370 4250 3070 766 313 175 189 240 348 377 289018 2270 3980 4060 2740 799 281 164 176 242 313 518 251019 1940 4350 3870 2340 724 256 162 158 231 343 974 211020 1680 4260 3740 1990 663 264 165 172 221 340 1220 178021 1480 4130 3600 1840 607 283 168 170 207 322 1180 167022 1440 3940 4080 1730 570 275 165 171 196 285 898 153023 1560 3680 4390 1640 539 278 159 173 197 278 671 135024 1870 3360 4490 1890 522 292 150 175 196 275 537 137025 2050 2920 4660 2110 508 275 150 187 195 276 491 197026 2480 2440 4970 2160 494 245 147 195 196 263 612 234027 2850 2010 5100 2010 491 219 146 191 198 249 783 251028 3120 1740 5140 1840 456 196 154 188 197 240 837 279029 3350 — 5010 1760 416 199 157 181 203 250 1140 347030 4390 — 4750 2030 377 205 148 174 212 263 1140 353031 6030 — 4420 — 384 — 139 168 — 267 — 3300

TOTAL 104910 115950 112980 75780 26942 8829 5370 6246 6983 9421 15258 62157 MEAN 3384 4141 3645 2526 869 294 173 201 233 304 509 2005 MAX 6030 7380 5140 3970 2110 378 214 340 403 437 1220 3530 MIN 1440 1510 1120 1640 377 196 139 140 172 214 216 912 AC-FT 208100 230000 224100 150300 53440 17510 10650 12390 13850 18690 30260 123300YEAR 2003 TOTAL=550826 MEAN=1509 MAX=7380 MIN=139 AC-FT=1093000

†Provisional data–subject to revision; e=estimated

WSLO — 14207500 —Tualatin River at West Linn, Oregon [RM 1.75]

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SPBR – 14211116 – SPRINGBROOK CR AT IRON MOUNTAIN RD NEAR LAKE OSWEGO, OREGON [RM 0.18]Latitude: 45 24 46 Longitude: 122 42 13 Source Agency: District 18 Watermaster


JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 1 6.88 17.5 2.72 4.54 3.87 1.01 .98 .73 .81 .55 .63 2.02 2 13.6 10.7 3.00 4.15 3.54 .97 1.01 .69 .81 .52 .70 3.63 3 10.2 7.63 3.07 5.22 3.38 1.09 .91 .68 .71 .57 .66 4.37 4 12.7 5.80 2.44 3.67 6.64 1.20 .85 .64 .70 .58 .59 5.49 5 6.24 4.61 2.30 4.21 3.80 1.51 .87 .62 .79 .57 .51 13.2 6 4.58 3.80 4.47 6.68 3.20 1.63 .97 .67 .93 2.04 .58 7.87 7 3.59 3.30 22.0 4.26 3.02 1.74 1.19 .80 1.35 1.14 .71 7.66 8 2.88 2.94 11.1 3.68 3.83 1.87 .84 1.03 1.29 1.13 .79 3.73 9 2.46 2.66 17.0 4.24 2.76 1.86 .80 1.01 4.53 2.63 .66 3.42

10 2.20 2.47 8.26 4.23 2.50 1.50 .72 .98 1.05 1.23 .74 4.9011 2.93 2.28 6.04 3.27 2.41 1.56 .75 1.09 .86 2.48 .76 4.3012 7.09 2.13 8.20 13.3 2.27 1.66 .79 .87 .77 2.33 .66 4.8813 6.28 2.07 9.03 18.0 2.19 1.82 .77 .85 .72 .95 .66 35.114 4.79 1.93 8.25 7.52 2.11 1.45 .75 .78 .70 1.15 .66 17.615 3.86 6.22 8.09 5.89 2.26 1.25 .77 .69 .70 1.75 2.13 7.8016 3.42 7.82 7.82 5.42 3.87 1.08 .75 .69 1.42 1.53 4.68 8.2017 3.21 29.3 5.90 9.71 6.33 1.05 .78 .70 .83 .80 2.67 6.1018 3.03 12.5 4.73 5.23 3.22 1.06 .86 .65 .71 .71 4.58 4.8619 2.79 7.99 6.42 4.36 2.61 1.06 .83 .69 .68 2.38 16.2 4.4720 2.63 6.52 4.78 3.93 2.19 1.71 .84 .71 .67 .84 5.35 7.2021 2.57 6.52 8.56 6.16 1.84 1.69 .87 .66 .63 .76 1.94 6.2622 6.38 5.08 13.7 3.90 1.80 1.56 .91 .77 .68 1.15 1.00 4.4723 3.58 4.31 7.86 9.28 1.63 1.43 .82 .75 .72 .97 .98 3.9924 4.90 3.72 5.88 7.34 1.55 1.18 .87 .74 .69 .67 1.48 11.225 4.72 3.29 5.29 7.14 1.55 1.05 .93 .71 .65 .64 2.88 11.926 9.90 2.98 5.92 5.64 1.37 .99 .95 .75 .66 .61 1.62 5.8127 5.03 2.76 6.00 4.46 1.34 .92 .83 .76 .68 .64 .78 13.528 3.62 3.19 4.35 4.73 1.35 .92 .87 .84 .66 .68 3.57 15.229 14.9 — 3.71 4.89 1.19 1.02 .91 .73 .66 1.37 12.4 17.530 23.2 — 3.45 5.96 1.11 .98 .96 .72 .62 .76 2.64 8.8831 64.4 — 4.13 — 1.07 — 1.03 .77 — .64 — 9.39

TOTAL 248.56 172.02 214.47 181.01 81.80 39.82 26.98 23.77 27.68 34.77 74.21 264.90MEAN 8.02 6.14 6.92 6.03 2.64 1.33 .87 .77 .92 1.12 2.47 8.55MAX 64.4 29.3 22.0 18.0 6.64 1.87 1.19 1.09 4.53 2.63 16.2 35.1MIN 2.20 1.93 2.30 3.27 1.07 .92 .72 .62 .62 .52 .51 2.02AC-FT 493 341 425 359 162 79 54 47 55 69 147 525YEAR 2003 TOTAL=1,389.99 MEAN=3.81 MAX=64.4 MIN=.51 AC-FT=2,760

SPBR — 14211116 — Springbrook Creek at Iron Mountain Rd near Lake Oswego, Oregon [RM 0.18]

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AAAAppppppppeeeennnnddddiiiixxxx FFFF

SSSSttttrrrreeeeaaaammmm TTTTeeeemmmmppppeeeerrrraaaattttuuuurrrreeee RRRReeeeccccoooorrrrddddssss

STREAM TEMPERATURE SITES — LOCATIONS


Withdrawal Points


North


SCBR

TRLF

Fanno

Creek

Cr

Cr

Cr

S. Rock

McF

ee C

r

Christensen

Creek

Creek

Cr

Ro

McKay

East

West

Gales

Creek

SCHO SCLO

SCOO

DLLO

Scog

Barney Reservoir

Scoggins Reservoir

DAIRY

ROODRCTV

FRMO

Lake Oswego

WI L L A M

E T T E RI V

ER

TU

AL

R

GALES

Dairy

Creek

Burris Cr

He Cr

Baker Cr

Chicken

Cedar Cr

Canal

(Hagg Lake)

Ash

Hedges

Sain Cr

Ta

gins

Car

pe

Dawson Cr

Brons

Beav

nner Cr

nter

Cr

Fork

Fork

onat

Lake Oswego

AT

IN

VE

RI

CedarMill Cr

S. on Cr

Springbrook Cr

Saum Cr

Butternut Cr

DCBR

on Cr

BCBR

BCSR

CMMB

SPBR

TRTFANO

JCDV

MCSCWCJS

WC143

WCHP

BCCH

WSLO

LOCS

HCTP ASMP

SLAB

SC121

SCRL

Sylvan Cr

Cr

Cr Sum

mer

Ck

Johns

Ericks

on

CkECMR

BVTS

Wil

wCr

lo

CCERELSN

MCMRBCHH

RCQR

ck

eek

RCWU RCRRCree

k

erto

n

CCSR

MCKH

MCKN

TRGC

EFDREFDD

WFDE

WFDM

GCCH

4550

GASO

TRTR

2460

2480

APPENDIX F—Stream Temperature Records2003 Tualatin River Flow Management Report F-3

STREAM TEMPERATURE SITES — ALPHABETICAL LISTING BY SITE CODESITE CODE SITE NAME RIVER MILE STATION ID PAGE

2480 Tualatin River above Barney Reservoir Outfall 78.1 14202480 F-42460 Tualatin River below Barney Reservoir Outfall 77.8 14202460 F-64550 Gales Creek above Glenwood, Oregon 19.9 14204550 F-12ASMP Ash Creek at Metzger Park at Metzger, Oregon 1.25 14206933 F-45BCBR Bronson Creek at Bronson Road near Orenco, Oregon 2.1 14206423 F-34BCCH Beaverton Creek at Cedar Hills Blvd at Beaverton, Oregon 7.45 14206360 F-27BCHH Burris Creek at Hwy 219 0.38 — F-39BCSR Bronson Creek at Saltzman Road near Orenco, Oregon 5.1 14206419 F-33BVTS Beaverton Creek at 216th near Orenco, Oregon 1.2 14206435 F-35CCER Cedar Creek at Edy Road near Sherwood, Oregon 0.62 14206748 F-42CCSR Chicken Creek at Scholls-Sherwood Road 2.3 14206750 F-43CMMB Cedar Mill Creek at Murray Boulevard near Beaverton, Oregon 1.64 14206395 F-30DAIRY Dairy Creek at Hwy 8 near Hillsboro, Oregon 2.06 14206200 F-23DCBR Dawson Creek at Brookwood Road near Hillsboro, Oregon 0.07 14206443 F-36DLLO Tualatin River at Dilley, Oregon 58.8 14203500 F-11ECMR Erickson Creek at Menlo Drive at Beaverton, Oregon 0.76 14206365 F-28EFDD East Fork Dairy Creek near Dairy Creek Rd near Mountaindale, OR 12.33 14205480 F-17EFDR East Fork Dairy Creek at Roy Road 1.24 — F-18ELSN Tualatin River at Elsner Road near Sherwood, Oregon 16.2 14206600 F-41FANO Fanno Creek at Durham Road near Tigard, Oregon 1.2 14206950 F-48FRMO Tualatin River at Farmington, Oregon 33.3 14206500 F-38GALES Gales Creek at Old Hwy 47 near Forest Grove, Oregon 2.36 14204530 F-14GASO Tualatin River at Gaston, Oregon 62.3 14202510 F-8GCCH Gales Creek at Clapshaw Hill Road near Gales Creek, Oregon 12.36 14204540 F-13HCTP Hedges Creek at Tualatin Community Park at Tualatin, Oregon 0.3 14206958 F-49JCDV Johnson Creek at Davis Road near Beaverton, Oregon 1.3 14206372 F-29LOCS Tualatin River at Oswego Canal near Lake Oswego, Oregon 6.7 14206990 F-52MCKH McKay Creek at Hornecker Rd near Hillsboro, Oregon 2.2 14206180 F-22MCKN McKay Creek at Northrup Road near North Plains, Oregon 15.5 14205980 F-19MCMR McFee Creek at Midway Road 2.04 — F-40MCSC McKay Creek at Scotch Church Road near Hillsboro, Oregon 6.3 14206070 F-20RCQR Rock Creek at Quatama near Orenco, Oregon 4.9 14206347 F-26RCRR Rock Creek at Rock Creek Road near Bowers Junction, Oregon 15.8 14206305 F-24RCTV Rock Creek at Hwy 8 near Hillsboro, Oregon 1.2 14206450 F-37RCWU Rock Creek at West Union Road near Bethany, Oregon 9.0 14206338 F-25ROOD Tualatin River at Rood Bridge Road near Hillsboro, Oregon 38.4 14206295 *

SC121 Summer Creek at 121st Avenue near Tigard, Oregon 1.0 14206938 F-47SCBR Saum Creek at Borland Road 0.6 — F-51SCLO Scoggins Creek above Henry Hagg Lake near Gaston, Oregon 8.0 14202850 F-9SCOO Scoggins Creek below Henry Hagg Lake near Gaston, Oregon 4.80 14202980 F-10SCRL Sylvan Creek at Raleighwood Lane near West Slope, Oregon 1.0 14206905 F-44SLAB Summer Creek above Summer Lake near Tigard, Oregon 1.52 — F-46SPBR Springbrook Creek at Iron Mountain Rd near Lake Oswego, Oregon 0.18 14211116 F-53TRGC Tualatin River at Golf Course Road near Cornelius, Oregon 51.5 14204800 *

TRLF Tualatin River below Lee Falls near Cherry Grove, Oregon 70.7 14202450 F-7TRT Tualatin River at Tualatin, Oregon 8.9 14206960 F-50TRTR Barney Reservoir Outfall to Tualatin River 78.0 14202470 F-5WC143 Willow Creek at 143rd Avenue near Beaverton, Oregon 3.5 14206410 F-31WCHP Willow Creek at Heritage Parkway near Beaverton, Oregon 0.75 14206413 F-32WCJS Waible Creek at Jackson School Road near Hillsboro, Oregon 1.0 14206100 F-21WFDE West Fork Dairy Creek at Evers Road 1.96 14205160 F-16WFDM West Fork Dairy Creek at Manning, Oregon 12.9 — F-15WSLO Tualatin River at West Linn 1.75 14207500 **ROOD site was temporarily discontinued due to construction; TRGC and WSLO sites had equipment malfunctions in 2003

APPENDIX F—Stream Temperature RecordsF-4 2003 Tualatin River Flow Management Report

14202480 – TUALATIN RIVER ABOVE BARNEY RESERVOIR OUTFALL [RM 78.1]Longtitude: 45 27 54 Longitude: 123 23 75 Source Agency: District 18 Watermaster

Day2003 Mean Daily Water Temperature in Degrees Celsius

JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 1 6.2 6.9 5.8 6.4 7.9 10.0 2 6.8 6.8 5.3 5.3 8.4 9.8 3 6.9 6.5 5.5 4.9 7.4 10.1 4 7.2 6.0 5.6 5.4 7.0 10.7 5 6.4 5.7 5.9 5.2 7.2 11.6 6 6.3 5.6 5.5 5.3 7.1 7 6.0 5.5 5.9 5.8 6.7 8 5.9 5.5 6.1 6.5 6.6 9 5.6 5.5 6.6 6.6 7.0

10 5.4 5.9 7.0 7.1 7.211 5.5 5.7 6.9 6.9 7.612 6.4 5.7 7.2 7.2 8.213 6.7 6.4 7.2 6.9 8.614 6.3 6.7 7.1 6.3 8.315 5.7 6.7 7.0 6.7 7.416 5.7 6.4 6.7 6.8 6.517 5.8 5.5 6.4 6.9 6.518 5.8 5.7 6.2 6.4 6.419 5.8 6.2 6.6 6.9 7.320 5.8 6.2 6.7 7.1 8.021 6.2 6.8 6.7 7.0 9.022 6.7 6.3 6.8 7.2 9.523 7.0 5.4 6.2 6.6 10.224 7.2 3.9 5.9 6.3 10.225 7.5 4.1 6.5 6.3 9.526 7.9 4.7 6.1 6.5 9.027 7.2 5.2 6.3 6.9 9.828 6.6 5.4 6.6 7.4 10.529 6.8 — 7.3 7.7 10.630 7.4 — 8.0 7.6 10.131 7.5 — 7.6 — 9.7 — — —

MEAN 6.5 5.8 6.5 6.5 8.2 10.4MAX 7.9 6.9 8.0 7.7 10.6 11.6MIN 5.4 3.9 5.3 4.9 6.4 9.8

14202480 – Tualatin River above Barney reservoir Outfall [RM 78.1]

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Oregon Temperature Guidelinefor Salmonid Rearing and Migration


TRTR – 14202470 – BARNEY RESERVOIR OUTFALL TO TUALATIN RIVER [RM 78.0]Latitude: 45 27 47 Longitude: 123 23 73 Source Agency: District 18 Watermaster



10 5.8 5.8 6.7 6.8 7.111 5.9 5.5 6.7 7.0 7.312 6.1 5.4 7.0 7.1 7.413 6.5 6.1 7.1 7.1 7.314 6.3 6.4 7.1 6.7 7.415 5.8 6.4 7.0 6.8 7.116 5.9 6.4 6.7 6.9 6.817 5.9 5.1 6.5 6.9 6.718 5.8 5.5 6.4 6.6 6.719 6.0 5.9 6.6 6.6 6.720 5.9 6.1 6.7 6.9 7.421 6.2 6.3 6.8 7.0 7.622 6.4 6.2 7.0 6.9 7.923 6.6 5.6 6.6 6.8 8.324 6.7 4.7 6.1 6.7 8.325 6.9 4.8 6.7 6.6 8.126 7.2 5.0 6.6 6.7 7.827 6.9 5.5 6.5 6.7 8.128 6.6 5.7 6.6 6.9 8.629 6.7 — 6.8 7.2 8.630 7.1 — 7.3 7.2 8.431 7.4 — 7.4 — 8.3 — — —

MEAN 6.3 5.8 6.5 6.7 7.5 7.6MAX 7.4 6.9 7.4 7.2 8.6 8.5MIN 5.6 4.7 5.6 5.6 6.7 7.3

TRTR – 14202470 – Barney Reservoir Outfall to Tualatin River [RM 78.0]

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14202460 – TUALATIN RIVER BELOW BARNEY RESERVOIR OUTFALL [RM 77.8]Latitude: 45 27 46 Longitude: 123 23 63 Source Agency: District 18 Watermaster


JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 1 6.2 6.9 5.9 6.9 7.6 8.8 7.7 8.3 12.0 14.3 5.1 2 6.8 6.8 5.4 6.4 7.8 8.1 7.6 8.3 12.2 14.4 5.2 3 6.8 6.6 5.6 6.3 7.4 7.6 7.7 8.3 12.5 14.5 4.6 4 7.1 6.0 5.7 6.5 7.2 7.6 7.7 8.4 12.7 14.5 4.9 5 6.4 5.6 6.0 6.4 7.3 7.6 7.8 8.4 12.9 14.5 4.6 6 6.2 5.6 5.5 6.5 7.3 7.7 7.8 8.5 13.2 14.5 4.6 7 5.9 5.4 5.9 6.6 7.1 7.7 7.8 8.5 13.4 14.5 5.4 8 5.7 5.4 6.1 6.9 7.0 7.7 7.8 8.6 13.7 14.5 5.9 9 5.5 5.4 6.6 7.0 7.2 7.6 7.8 8.6 14.0 14.4 6.1

10 5.4 5.9 7.0 7.1 7.3 7.6 7.8 8.7 14.0 14.3 6.511 5.5 5.6 6.9 7.1 7.5 7.6 7.9 8.7 14.0 14.2 7.412 6.3 5.6 7.2 7.2 7.8 7.6 7.9 8.8 14.2 13.9 6.413 6.6 6.3 7.2 7.1 8.1 7.6 7.9 8.9 14.3 13.9 6.214 6.3 6.7 7.1 6.9 7.9 7.6 7.9 9.0 14.3 13.915 5.7 6.7 7.0 7.0 7.4 7.6 7.9 9.1 14.3 13.616 5.8 6.4 6.7 7.1 6.9 7.7 7.9 9.2 14.1 13.217 5.9 5.5 6.4 7.1 7.0 7.8 7.9 9.3 14.0 12.818 5.8 5.7 6.3 7.0 6.9 7.7 8.0 9.4 13.9 10.219 5.9 6.2 6.6 7.1 7.3 7.5 8.0 9.5 13.9 10.620 6.0 6.3 6.8 7.2 7.7 7.5 8.0 9.7 13.9 11.421 6.3 6.8 6.7 7.2 8.2 7.5 8.0 9.8 13.8 11.922 6.7 6.3 6.8 7.3 8.5 7.5 8.1 9.9 13.9 11.423 6.9 5.5 6.3 7.0 8.9 7.5 8.1 10.0 13.9 10.024 7.1 4.0 6.0 6.9 9.0 7.6 8.1 10.2 13.9 8.625 7.5 4.1 6.6 7.0 8.5 7.6 8.1 10.4 14.0 8.626 7.9 4.7 6.2 7.0 8.2 7.7 8.1 10.6 14.0 9.027 7.2 5.3 6.4 7.2 8.6 7.7 8.1 10.8 14.1 9.328 6.6 5.5 6.8 7.4 9.1 7.7 8.2 11.0 14.1 10.029 6.8 — 7.2 7.5 9.0 7.8 8.2 11.2 14.2 8.830 7.3 — 7.5 7.4 8.8 7.7 8.2 11.5 14.2 7.431 7.5 — 7.4 — 8.6 — 8.3 11.8 — 5.6 —

MEAN 6.4 5.8 6.5 7.0 7.8 7.7 7.9 9.5 13.7 12.0 5.6MAX 7.9 6.9 7.5 7.5 9.1 8.8 8.3 11.8 14.3 14.5 7.4MIN 5.4 4.0 5.4 6.3 6.9 7.5 7.6 8.3 12.0 5.6 4.6

14202460 – Tualatin River below Barney reservoir Outfall [RM 77.8]

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TRLF – 14202450 – TUALATIN RIVER BELOW LEE FALLS [RM 70.5]



JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 1 6.5 7.0 5.9 7.3 11.7 12.0 12.5 13.8 4.2 6.9 2 7.0 6.9 5.3 6.2 11.4 11.7 12.9 13.8 4.5 7.1 3 7.1 6.5 5.3 5.6 11.2 11.0 11.5 13.6 13.8 3.9 6.5 4 7.5 5.8 5.0 5.8 11.6 11.3 11.3 14.0 13.7 4.0 5.7 5 6.4 5.1 6.1 5.7 12.1 11.3 11.1 13.9 13.9 3.7 6.8 6 5.9 5.0 6.0 5.8 12.6 11.5 10.9 13.9 13.5 3.4 6.9 7 5.5 4.7 6.1 6.5 13.1 11.7 11.3 13.8 13.6 3.9 6.7 8 5.1 4.5 6.3 7.0 12.7 11.2 13.2 13.0 4.9 6.5 9 4.9 4.5 6.9 7.2 11.3 13.3 12.1 5.2 6.4

10 5.1 5.4 7.3 7.4 11.9 11.3 13.8 11.7 5.7 5.811 5.2 4.8 7.3 7.6 12.0 11.1 14.3 11.5 6.8 6.112 6.0 4.7 7.5 7.8 11.9 10.9 13.6 11.5 5.8 6.613 6.7 5.6 7.6 7.7 11.2 13.2 11.5 4.8 6.714 6.4 6.6 7.5 6.9 10.8 11.3 13.4 11.6 5.8 5.815 5.5 6.5 7.4 7.1 11.3 11.7 11.6 12.9 11.1 6.7 5.716 5.5 6.6 6.9 7.3 7.5 11.9 11.2 12.7 10.9 6.7 5.917 5.3 6.0 6.4 7.5 7.2 12.5 11.6 12.3 11.9 7.2 6.418 5.0 5.7 6.2 6.8 7.0 12.0 11.7 12.0 12.8 11.7 8.4 5.719 4.9 6.3 6.8 7.2 7.7 12.0 13.6 11.7 7.7 5.720 5.2 6.5 7.1 7.8 12.0 11.2 12.7 12.3 5.7 6.421 5.8 7.2 6.9 7.9 9.8 12.6 11.6 12.7 13.1 4.9 6.922 6.2 6.3 7.1 7.6 12.9 11.8 12.9 13.1 3.9 6.423 6.9 5.4 6.5 7.3 11.6 9.7 12.2 11.2 13.1 11.3 4.3 5.724 7.2 3.7 5.9 7.0 12.1 9.9 11.7 11.4 13.4 9.8 4.6 6.225 7.6 3.2 6.7 6.7 11.2 10.8 11.6 11.9 13.6 9.2 5.2 5.726 8.1 3.9 6.6 7.0 11.6 11.7 12.2 14.0 9.4 5.7 5.127 7.3 4.8 6.5 7.1 11.0 12.1 11.8 12.1 14.2 9.8 5.7 4.728 6.4 5.2 6.9 7.8 12.3 12.2 12.1 12.1 14.2 10.8 6.2 4.829 6.8 — 7.4 12.6 12.5 12.5 13.8 9.8 7.4 4.530 7.4 — 8.2 11.9 12.9 12.9 13.8 8.3 6.7 4.131 7.6 — 8.4 — — 12.7 12.9 — 5.5 — 3.9

MEAN 6.3 5.5 6.7 7.0 9.7 11.7 11.9 11.6 13.4 11.6 5.5 5.9MAX 8.1 7.2 8.4 7.9 12.3 13.1 12.9 12.9 14.3 13.9 8.4 7.1MIN 4.9 3.2 5.0 5.6 7.0 9.7 11.0 10.9 12.3 5.5 3.4 3.9

TRLF – 14202450 – Tualatin River below Lee Falls [RM 70.5]

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GASO – 14202510 – TUALATIN RIVER AT GASTON, OREGON [RM 62.3]Latitude: 45 26 21 Longitude: 123 07 85 Source Agency: District 18 Watermaster



10 4.2 4.4 6.6 7.2 7.9 12.6 14.8 13.1 13.4 10.8 5.1 4.711 4.2 3.8 6.7 7.5 8.8 13.3 15.3 12.8 14.4 10.0 6.2 5.112 5.1 3.7 6.9 7.7 9.4 12.8 14.9 12.5 14.0 10.2 5.0 5.613 5.9 4.7 6.8 7.8 10.2 12.3 14.3 12.7 12.8 10.5 4.1 5.914 5.7 6.0 6.8 6.4 10.4 12.7 13.9 13.2 12.7 10.7 4.8 4.915 4.7 5.7 6.8 7.0 9.4 13.1 14.3 12.8 12.1 9.8 5.6 4.716 4.6 5.9 6.3 7.3 8.0 14.4 14.2 12.0 12.0 10.3 5.9 4.717 4.4 5.3 5.7 7.4 7.7 15.3 13.5 13.2 11.4 11.4 6.0 5.518 4.0 5.0 5.4 6.5 7.7 14.3 14.4 13.9 12.2 11.3 7.2 4.619 3.7 5.6 6.0 7.1 8.5 11.2 15.1 13.8 13.2 11.7 7.3 4.420 4.3 5.7 6.6 7.9 9.5 10.9 15.3 12.3 12.5 12.7 4.6 5.421 4.9 6.5 6.3 7.6 10.8 10.9 16.1 12.7 12.3 13.6 3.6 6.022 5.3 5.7 6.5 7.6 12.4 10.2 16.5 13.0 12.8 13.4 2.4 5.423 6.0 4.8 5.8 6.9 13.2 10.5 15.6 12.1 13.0 11.3 2.9 4.524 6.4 3.0 5.2 7.0 13.8 11.1 14.4 12.1 13.3 9.4 3.4 5.225 6.9 2.4 6.1 6.5 12.5 12.8 14.0 12.8 13.5 8.7 3.7 4.926 7.5 3.0 6.2 7.0 11.8 14.4 14.4 13.1 14.2 8.7 4.4 4.027 6.5 4.1 5.7 7.5 12.6 15.3 14.6 13.0 14.5 8.9 4.4 3.828 5.5 4.4 6.3 8.0 14.1 15.4 15.2 12.8 14.6 10.4 4.9 3.929 5.9 — 7.0 8.9 14.5 16.0 15.8 13.4 13.9 9.8 6.1 3.630 6.6 — 7.9 9.0 13.7 15.1 16.3 13.9 13.4 7.9 5.8 3.031 7.0 — 8.4 — 12.7 — 16.0 13.8 — 4.7 — 2.9

MEAN 5.4 4.7 6.1 6.9 10.1 13.4 14.6 13.1 13.4 11.0 4.3 4.9MAX 7.5 6.5 8.4 9.0 14.5 16.0 16.5 15.0 15.1 13.6 7.3 6.0MIN 3.7 2.4 4.1 4.9 7.4 10.2 12.6 12.0 11.4 4.7 2.0 2.9

GASO – 14202510 – Tualatin River at Gaston, Oregon [RM 62.3]

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SCLO – 14202850 — SCOGGINS CREEK ABOVE HENRY HAGG LAKE NEAR GASTON, OREGON [RM 8.0]Latitude: 45 30 06 Longitude: 123 15 06 Source Agency: District 18 Watermaster


JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 1 13.7 16.2 14.4 13.7 4.1 7.5 2 12.8 16.7 15.6 13.8 4.8 7.6 3 13.3 16.2 16.3 13.9 4.1 6.9 4 13.8 15.8 17.0 13.3 4.3 6.2 5 13.8 15.3 16.4 13.7 3.9 6 14.2 15.0 16.1 13.1 3.7 7 14.4 16.0 15.8 13.3 4.5 8 14.6 15.6 14.0 12.3 5.7 9 14.6 16.0 13.7 11.0 6.0

10 13.1 15.4 15.6 14.2 10.6 6.411 13.2 16.0 14.9 15.2 10.2 7.412 12.8 15.6 14.4 13.9 10.5 6.313 12.7 15.5 14.9 13.1 10.3 5.614 12.3 15.2 15.7 13.2 10.6 6.615 12.8 15.4 16.2 12.0 9.9 7.316 13.5 15.3 15.1 12.0 10.6 7.417 14.3 14.9 15.9 11.3 11.9 7.718 13.5 15.5 16.7 12.1 11.4 9.019 11.5 16.1 16.3 13.3 12.0 8.220 11.7 16.4 14.4 12.2 12.7 6.121 11.1 17.9 15.2 12.2 13.5 5.322 10.7 18.0 15.3 13.3 13.5 4.423 11.0 16.5 14.2 13.1 11.1 5.124 11.3 15.3 14.1 13.7 9.9 5.225 12.6 14.9 14.8 13.7 9.8 5.726 14.5 15.4 15.3 14.8 10.0 6.227 15.4 15.9 15.0 15.3 10.3 6.328 15.6 16.6 14.8 14.9 11.6 6.929 — 16.4 17.6 15.3 14.3 10.0 8.130 — 15.3 18.1 16.1 14.0 8.1 7.531 — — — 17.4 15.6 — 5.1 —

MEAN 13.1 15.5 15.4 14.0 11.3 6.0 7.1MAX 16.4 18.1 16.7 17.0 13.9 9.0 7.6MIN 10.7 12.8 14.1 11.3 5.1 3.7 6.2

SCLO – 14202850 – Scoggins Creek above Henry Hagg Lake near Gaston, Oregon [RM 8.0]

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SCOO – 14202980 – SCOGGINS CREEK BELOW HENRY HAGG LAKE NEAR GASTON, OREGON [RM 4.80]Latitude: 45 28 10 Longitude: 123 11 56 Source Agency: District 18 Watermaster



10 6.8 6.9 7.0 7.5 8.011 6.8 6.9 7.7 7.6 8.012 6.9 7.0 7.7 7.6 8.013 6.8 6.9 7.0 7.7 8.214 6.7 6.8 7.1 7.5 8.015 6.7 6.9 7.2 7.7 8.016 6.7 6.9 7.1 7.7 8.017 6.6 6.9 7.1 7.7 8.118 6.6 7.1 7.1 7.7 8.119 6.6 7.0 7.1 7.7 8.120 6.6 6.9 7.3 7.7 8.221 6.6 7.1 7.2 7.7 8.322 6.6 7.3 7.4 7.7 8.223 6.6 7.0 7.7 7.7 8.324 6.7 6.9 9.2 7.8 8.125 6.7 6.9 8.9 7.7 8.226 6.7 6.9 9.3 7.8 8.227 6.8 6.9 8.2 7.8 8.428 6.7 6.8 7.5 7.9 8.429 6.7 — 7.4 7.9 8.530 6.9 — 7.3 8.0 8.231 7.3 — 7.4 — 8.5 — — —

MEAN 6.8 7.0 7.4 7.6 8.1 8.3MAX 7.3 7.5 9.3 8.0 8.5 8.4MIN 6.6 6.8 6.8 7.3 7.8 8.2

SCOO – 14202980 – Scoggins Creek below Henry Hagg Lake near Gaston, Oregon [RM 4.80]

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DLLO – 14203500 – TUALATIN RIVER AT DILLEY, OREGON [RM 58.8]Latitude: 45 28 30 Longitude: 123 07 23 Source Agency: District 18 Watermaster



10 5.7 6.4 8.9 9.5 9.7 11.1 11.6 11.8 15.0 15.3 10.411 5.8 6.2 8.9 9.7 10.3 11.4 11.6 11.8 15.8 14.4 10.612 6.4 6.1 8.9 9.7 10.8 11.2 11.6 11.8 15.8 13.8 9.713 7.4 6.6 9.0 10.1 11.5 10.7 11.4 12.0 15.3 13.9 9.614 7.6 7.3 8.8 9.3 12.1 11.0 11.2 12.3 15.4 14.6 9.915 7.0 7.4 9.1 9.5 11.0 11.2 11.4 12.3 15.0 14.1 10.016 6.7 7.5 8.9 9.9 10.0 11.6 11.5 12.0 15.4 14.2 9.617 6.4 7.3 8.3 9.9 9.6 11.9 11.3 12.6 15.2 14.718 6.1 7.0 7.9 9.2 9.8 11.2 11.4 13.0 16.0 15.119 5.7 7.7 8.1 9.4 10.3 10.5 11.6 13.0 16.6 15.420 5.9 7.7 8.2 10.0 11.1 10.5 11.7 12.6 16.3 15.821 6.5 8.3 8.3 9.7 11.7 10.5 12.0 12.7 16.5 16.322 6.9 8.0 9.2 9.5 13.1 10.2 12.0 12.8 17.1 16.123 7.4 7.5 8.6 9.2 13.0 10.2 11.8 12.5 17.0 15.124 7.9 5.8 8.5 9.0 13.5 10.6 11.5 12.5 17.3 14.725 8.3 4.8 8.8 8.9 12.6 11.5 11.4 13.0 17.4 14.826 9.1 5.0 9.2 9.1 12.1 12.0 11.4 13.2 17.7 14.727 8.5 5.9 8.8 9.6 12.7 11.8 11.5 13.4 17.7 14.728 7.4 6.5 8.7 10.1 14.8 11.8 11.7 13.3 17.7 15.429 7.4 — 9.4 10.6 15.0 12.0 11.8 13.6 17.6 14.830 8.3 — 10.3 11.4 14.8 11.6 11.8 14.0 17.5 13.931 9.5 — 10.6 — 13.1 — 11.7 14.0 — 12.8 —

MEAN 7.2 6.9 8.4 9.3 11.4 11.7 11.5 12.4 15.9 15.5 10.3MAX 9.5 8.8 10.6 11.4 15.0 14.4 12.0 14.0 17.7 17.6 12.1MIN 5.5 4.8 6.3 7.4 9.3 10.2 11.1 11.2 13.9 12.8 9.6

DLLO – 14203500 – Tualatin River at Dilley, Oregon [RM 58.8]

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14204550 – GALES CREEK ABOVE GLENWOOD, OREGON [RM 19.9]Latitude: 45 31 12 Longitude: 123 00 38 Source Agency: District 18 Watermaster


JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 1 7.1 7.6 6.7 7.5 8.9 11.1 2 7.7 7.6 6.0 6.5 9.2 11.0 3 7.7 7.2 6.2 6.4 8.4 11.4 4 7.9 6.7 5.9 6.8 8.2 12.1 5 7.2 6.2 6.9 6.4 8.1 12.8 6 6.9 5.9 6.6 6.9 8.1 13.5 7 6.6 5.7 6.7 7.4 7.8 14.0 8 6.2 5.6 6.8 7.9 7.8 13.4 9 6.0 5.7 7.3 7.7 7.9

10 6.1 6.4 7.7 8.1 8.111 6.2 5.7 7.7 8.0 8.812 6.8 5.8 7.9 8.4 9.013 7.3 6.8 7.9 8.1 9.514 6.7 7.3 7.9 7.4 9.415 6.3 7.2 7.8 7.8 8.516 6.4 7.1 7.5 7.9 7.717 6.0 6.5 7.0 7.9 7.618 5.8 6.6 7.0 7.4 7.519 6.1 7.1 7.5 8.0 8.420 6.4 7.2 7.6 8.3 9.021 6.6 7.7 7.5 8.1 10.022 6.8 7.1 7.6 8.1 10.523 7.4 6.2 7.1 7.6 11.324 7.6 4.7 6.8 7.3 11.225 8.0 4.5 7.5 7.3 10.426 8.4 5.2 7.3 7.7 10.127 7.7 5.9 7.2 8.1 10.928 7.1 6.2 7.6 8.4 11.629 7.5 — 8.1 8.8 11.530 8.0 — 8.8 8.7 11.131 8.2 — 8.6 — 10.9 — — —

MEAN 7.0 6.4 7.3 7.7 9.3 12.4MAX 8.4 7.7 8.8 8.8 11.6 14.0MIN 5.8 4.5 5.9 6.4 7.5 11.0

14204550 – Gales Creek above Glenwood, Oregon [RM 19.9]

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GCCH – 14204540 – GALES CREEK AT CLAPSHAW HILL ROAD NEAR GALES CREEK, OREGON [RM 12.36]Latitude: 45 35 39 Longitude: 123 12 38 Source Agency: District 18 Watermaster


JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 1 7.5 8.0 8.2 9.6 10.9 13.9 2 8.1 8.0 7.5 8.9 11.1 13.2 3 8.1 7.6 7.7 8.3 10.6 13.4 4 8.4 7.2 7.2 8.2 10.2 14.6 5 7.5 7.1 8.2 8.0 10.1 15.6 6 7.0 7.3 8.2 8.0 9.9 16.7 7 6.5 7.1 7.7 8.4 9.7 17.4 8 6.0 6.9 7.7 8.8 9.7 15.9 9 6.1 6.8 8.0 9.2 9.6

10 7.2 7.4 8.3 9.4 9.911 6.7 7.4 8.4 9.7 10.912 7.3 7.3 8.6 9.8 11.113 8.0 7.8 8.6 9.8 11.414 7.9 8.6 8.6 9.2 11.515 7.8 8.2 8.5 9.3 10.316 7.7 8.5 8.1 9.5 9.517 6.9 7.7 7.6 9.8 9.318 5.7 7.4 7.6 9.5 9.219 6.1 7.9 8.2 9.8 10.320 6.8 8.1 8.5 10.1 11.421 7.2 8.6 8.4 10.1 12.622 7.4 8.6 8.4 10.1 14.023 8.0 8.1 7.7 9.7 14.724 8.3 7.2 7.3 9.2 14.725 8.8 6.5 8.0 9.2 13.726 9.1 6.7 8.5 9.4 13.227 8.6 7.4 8.3 9.8 14.028 8.0 7.7 8.7 10.4 15.129 8.3 — 9.0 10.7 14.430 8.6 — 9.5 11.0 14.131 8.8 — 9.9 — 13.6 — — —

MEAN 7.6 7.6 8.2 9.4 11.6 15.1MAX 9.1 8.6 9.9 11.0 15.1 17.4MIN 5.7 6.5 7.2 8.0 9.2 13.2

GCCH – 14204540 – Gales Creek at Clapshaw Hill Road near Gales Creek, Oregon [RM 12.36]

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GALES – 14204530 – GALES CREEK AT OLD HWY 47 NEAR FOREST GROVE, OREGON [RM 2.36]Latitude: 45 30 39 Longitude: 123 06 56 Source Agency: District 18 Watermaster



10 6.5 6.6 8.4 9.5 10.2 16.1 20.8 20.3 17.0 13.1 6.9 7.011 6.5 6.5 8.6 9.7 10.9 16.7 21.7 19.7 17.6 12.2 7.712 6.7 6.1 8.7 9.9 11.5 16.6 21.7 19.2 17.6 11.6 7.313 7.3 6.5 8.7 10.2 12.2 15.5 20.7 19.5 17.1 11.7 6.514 7.6 7.5 8.7 8.7 13.0 16.1 20.1 20.4 16.9 12.2 6.715 7.1 7.5 8.8 9.2 11.6 16.3 20.8 20.8 15.6 11.8 7.516 6.8 7.8 8.6 9.4 10.5 18.0 20.6 19.4 15.2 11.8 7.917 6.5 7.3 8.2 9.7 9.9 19.3 20.1 20.4 14.6 13.2 7.718 6.0 7.1 7.8 8.8 9.9 18.7 20.9 21.3 14.9 13.5 9.119 5.9 7.7 8.2 9.4 11.2 15.5 21.8 21.0 15.8 13.7 9.320 6.3 7.7 8.5 10.3 12.2 14.3 22.4 19.8 15.3 14.7 6.821 6.8 8.3 8.4 9.9 12.8 14.1 23.7 20.0 15.5 15.4 5.922 7.1 7.9 8.7 9.7 15.0 13.5 23.8 20.2 16.2 15.3 4.623 7.5 7.3 8.4 9.2 15.2 13.4 22.7 18.9 16.3 13.5 5.124 7.9 5.4 7.6 8.9 16.4 14.2 21.3 18.7 16.9 11.7 5.625 8.4 4.5 8.0 8.8 14.6 16.6 20.7 19.3 17.0 11.0 5.726 9.1 5.0 8.3 9.3 13.9 19.1 20.9 19.7 17.8 11.0 6.227 8.7 6.4 8.3 10.0 14.8 20.7 21.4 19.4 18.2 11.3 6.228 7.9 6.5 8.3 10.7 16.5 21.3 22.3 19.2 18.1 12.5 6.929 7.8 — 8.5 11.3 16.5 21.9 23.3 19.4 17.6 12.1 8.130 8.2 — 9.1 11.4 16.2 20.8 23.9 20.3 17.2 10.2 8.031 8.5 — 10.0 — 14.6 — 23.3 20.1 — 7.0 —

MEAN 7.4 6.9 8.1 9.3 12.4 17.4 21.0 20.1 17.5 13.3 6.3 7.4MAX 9.1 8.3 10.0 11.4 16.5 21.9 23.9 22.1 21.0 16.6 9.3 7.9MIN 5.9 4.5 6.2 7.4 9.6 13.4 17.9 18.7 14.6 7.0 3.8 6.2

GALES – 14204530 – Gales Creek at Old Hwy 47 near Forest Grove, Oregon [RM 2.36]

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WFDM – WEST FORK DAIRY CREEK AT MANNING, OREGON [RM 12.9]Latitude: 45 39 36 Longitude 123 09 18 Source Agency: District 18 Watermaster


JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 1 7.7 8.6 7.1 9.1 10.8 14.2 17.0 19.7 17.3 15.9 5.7 7.5 2 8.1 8.4 6.3 7.8 11.4 14.2 16.1 19.3 18.0 15.7 5.4 7.5 3 8.3 7.7 6.5 7.4 10.7 14.6 16.4 18.6 18.6 15.7 4.7 7.3 4 8.7 7.2 6.0 7.8 9.9 15.4 16.8 18.2 19.4 15.3 4.3 6.1 5 8.0 6.5 7.1 7.2 10.0 16.5 17.0 18.1 19.4 15.1 3.9 6 7.1 6.2 7.6 7.8 10.0 17.5 17.1 17.4 19.0 14.6 3.5 7 6.4 5.8 7.4 8.4 9.5 18.5 17.4 18.5 18.2 14.7 3.8 8 5.8 5.6 7.4 9.2 9.1 18.0 17.5 18.3 16.6 14.2 4.6 9 5.3 5.5 8.1 9.7 9.1 16.3 17.5 18.4 15.7 13.1 5.1

10 5.7 6.6 8.6 9.5 9.6 15.1 18.4 18.3 15.7 12.3 5.511 5.8 6.0 8.8 9.8 10.3 15.1 19.0 17.8 16.2 11.6 6.412 6.7 5.6 9.1 10.0 10.7 14.9 19.2 17.3 15.7 11.4 6.413 7.7 6.4 9.1 10.2 11.2 14.4 18.6 17.7 15.3 11.4 5.814 7.5 7.5 9.0 8.9 11.7 14.4 18.2 18.4 15.4 11.7 6.115 6.7 7.4 9.0 9.1 10.6 14.8 18.5 19.0 14.2 11.0 6.716 6.5 7.7 8.6 9.5 9.6 15.7 18.3 17.9 13.7 11.3 7.117 6.1 7.4 7.9 9.6 9.0 16.8 18.1 18.6 13.3 12.5 7.518 5.4 7.3 7.8 8.6 8.8 16.7 18.8 19.4 13.7 12.5 8.419 5.5 7.8 8.3 9.1 9.7 14.8 19.2 18.9 14.6 13.1 8.620 6.0 7.7 8.7 9.9 10.8 13.6 19.8 17.9 14.0 13.8 6.921 6.6 8.4 8.6 9.8 11.8 13.3 20.9 18.5 14.1 14.5 5.722 7.0 7.9 8.8 9.5 13.3 12.4 20.9 18.3 14.8 14.9 4.423 7.5 7.1 8.6 9.0 13.9 12.5 19.9 16.9 15.3 13.6 4.424 8.0 5.3 7.9 8.6 14.5 13.1 19.0 16.9 15.9 12.2 4.725 8.8 4.3 8.3 8.5 13.7 14.7 18.6 17.5 15.8 11.5 5.126 9.5 4.9 8.7 8.8 13.1 16.7 18.7 17.9 16.5 11.3 5.727 8.7 6.3 8.2 9.4 13.6 18.2 19.0 17.2 16.8 11.2 5.728 7.6 6.4 8.4 10.2 14.7 18.6 20.1 17.0 16.8 11.8 6.129 7.9 — 8.9 10.9 14.8 19.3 20.9 17.5 16.3 11.2 7.330 8.4 — 9.9 11.1 14.6 18.5 21.4 18.5 16.0 10.0 7.531 8.9 — 10.3 — 13.9 — 20.6 18.2 — 7.6 —

MEAN 7.2 6.8 8.2 9.1 11.4 15.6 18.7 18.1 16.1 12.8 5.8 7.1MAX 9.5 8.6 10.3 11.1 14.8 19.3 21.4 19.7 19.4 15.9 8.6 7.5MIN 5.3 4.3 6.0 7.2 8.8 12.4 16.1 16.9 13.3 7.6 3.5 6.1

WFDM – West Fork Dairy Creek at Manning, Oregon [RM 12.9]

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WFDE – 14205160 – WEST FORK DAIRY CREEK AT EVERS ROAD BRIDGE [RM 1.96]Latitude: 45 34 34 Longitude: 123 05 34 Source Agency: District 18 Watermaster


JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 1 7.7 9.1 7.3 10.8 11.2 14.3 18.0 20.0 18.2 16.3 6.9 7.5 2 8.1 9.0 7.4 10.6 11.4 14.5 17.3 19.6 18.3 16.2 6.3 7.7 3 8.5 8.6 7.0 10.2 11.6 14.5 17.4 19.1 18.7 16.1 5.6 7.6 4 8.7 8.3 6.8 9.8 11.7 14.7 17.7 19.1 19.4 15.8 5.3 5 8.2 7.9 7.1 9.7 11.5 15.1 17.7 19.0 19.6 15.5 4.8 6 7.3 7.6 7.8 9.5 11.5 15.7 18.0 18.0 19.6 15.1 4.7 7 6.8 7.3 7.8 9.5 11.4 16.3 18.4 18.8 19.1 15.1 4.8 8 6.1 6.8 7.9 9.5 11.4 16.9 18.4 18.8 17.9 14.7 5.3 9 5.5 6.4 8.3 9.8 11.2 17.4 18.6 19.1 17.0 14.0 6.2

10 5.5 6.7 8.8 10.1 11.1 17.0 19.0 19.1 16.4 13.3 6.511 5.6 7.0 9.1 10.3 11.1 16.6 19.3 18.8 16.9 12.5 7.112 6.2 6.9 9.6 10.4 11.2 16.3 19.9 18.3 16.9 12.1 7.013 7.1 7.0 9.9 10.5 11.4 15.9 19.5 18.5 16.4 12.4 6.714 7.4 7.3 9.8 10.6 11.6 15.7 18.9 19.0 16.5 12.6 6.915 7.2 7.6 10.0 10.5 11.9 16.1 19.3 19.6 15.4 12.0 7.316 7.0 7.7 9.8 10.5 11.8 17.3 19.3 18.6 14.8 12.1 7.617 6.7 7.8 9.3 10.5 11.6 18.0 18.9 18.9 14.5 13.3 7.618 6.2 7.8 9.1 10.5 11.4 17.6 19.4 20.1 14.2 13.6 8.519 5.9 7.8 9.2 10.5 11.2 16.1 19.9 20.1 15.0 14.1 8.920 6.0 8.0 9.1 10.5 11.3 15.3 20.4 19.0 14.7 14.8 7.621 6.4 8.4 9.4 10.6 11.6 14.6 21.6 18.9 14.8 16.2 6.522 6.8 8.7 9.4 10.6 11.9 13.9 21.5 18.8 15.4 16.2 4.923 7.2 8.2 9.4 10.6 12.4 13.8 20.7 17.9 16.0 14.6 4.824 7.7 6.6 9.2 10.6 13.0 14.1 20.2 17.7 16.1 13.1 5.025 8.4 5.6 9.2 10.4 13.4 15.4 19.1 18.3 16.2 12.8 5.226 9.2 5.6 9.5 10.3 13.6 17.5 18.9 18.1 16.7 12.4 5.527 9.3 6.5 9.6 10.3 13.6 19.0 19.2 18.1 17.4 12.4 5.828 8.5 7.1 9.7 10.4 13.7 19.5 19.9 18.3 17.6 13.2 6.229 8.3 — 9.9 10.6 14.0 20.2 20.7 18.6 17.4 12.4 7.130 8.5 — 10.3 10.9 14.3 19.3 21.2 19.2 16.8 10.9 7.431 9.2 — 10.7 — 14.3 — 21.3 19.1 — 8.7 —

MEAN 7.3 7.5 8.9 10.3 12.1 16.3 19.3 18.9 16.8 13.7 6.3 7.6MAX 9.3 9.1 10.7 10.9 14.3 20.2 21.6 20.1 19.6 16.3 8.9 7.7MIN 5.5 5.6 6.8 9.5 11.1 13.8 17.3 17.7 14.2 8.7 4.7 7.5

WFDE – 14205160 – West Fork Dairy Creek at Evers Road Bridge [RM 1.96]

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EFDD – 14205480 – EAST FORK DAIRY CREEK AT DAIRY CREEK RD NEAR MOUNTAINDALE, OR [RM 12.33]Latitude: 45 40 32 Longitude: 123 03 54 Source Agency: District 18 Watermaster



10 5.8 6.7 8.6 9.1 9.0 13.0 16.3 16.4 13.9 11.2 6.711 5.8 6.0 8.7 9.4 9.8 13.3 16.9 15.8 14.7 10.4 8.012 7.0 5.9 8.9 9.7 9.9 12.5 16.6 15.5 14.4 10.6 7.113 7.7 6.9 8.9 9.6 10.6 12.6 16.0 16.0 13.9 10.9 6.014 7.3 7.6 8.8 8.5 10.4 12.5 15.8 16.8 14.0 11.2 6.915 6.5 7.3 8.9 8.8 9.2 13.4 16.1 16.9 12.9 10.1 7.616 6.4 7.6 8.4 9.0 8.4 14.1 15.9 15.9 12.7 10.7 7.817 6.0 7.3 7.5 9.0 8.2 15.1 15.8 16.8 12.4 12.618 5.6 7.5 7.6 8.0 8.1 14.4 16.5 17.7 12.8 12.419 5.5 7.7 8.0 8.9 9.5 12.1 16.9 17.3 13.6 12.6 8.820 6.3 7.6 8.6 9.5 10.1 12.1 17.4 16.1 13.2 13.2 7.521 6.7 8.4 8.2 9.1 11.6 11.5 18.6 16.9 13.2 14.3 6.022 7.0 7.6 8.6 9.1 12.1 10.9 18.8 16.6 14.3 14.3 4.623 7.8 6.7 7.8 8.3 12.9 11.4 17.6 15.3 14.7 11.9 4.424 8.0 5.0 7.3 8.2 13.0 12.0 16.7 15.3 14.8 10.4 4.725 8.7 4.6 8.1 8.0 12.1 13.6 16.3 16.0 14.8 10.2 5.326 9.5 5.3 8.2 8.5 11.8 15.6 16.6 16.4 15.6 10.5 5.827 8.3 6.4 7.7 9.1 12.6 16.4 17.0 15.6 16.2 11.0 5.728 7.4 6.3 8.1 9.7 13.6 16.5 17.9 15.7 15.9 12.2 6.029 7.8 — 8.9 10.4 13.3 17.2 18.8 16.3 15.2 10.6 7.230 8.4 — 9.8 10.2 12.8 15.6 19.1 17.2 14.7 8.6 7.531 9.0 — 9.8 — 12.6 — 18.4 16.9 — 5.7 —

MEAN 7.2 6.8 8.0 8.7 10.5 13.8 16.4 16.4 14.9 11.9 5.9 7.5MAX 9.5 8.4 9.8 10.4 13.6 17.2 19.1 17.7 18.1 14.5 8.8 7.5MIN 5.3 4.6 6.1 6.7 8.1 10.9 13.9 15.3 12.4 5.7 3.6 7.4

EFDD – 14205480 – East Fork Dairy Creek at Dairy Creek Road near Mountaindale, Oregon [RM 12.33]

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EFDR – EAST FORK DAIRY CREEK AT ROY ROAD [RM 1.24]Latitude: 45 34 43 Longitude: 123 04 14 Source Agency: District 18 Watermaster



10 5.6 6.7 9.0 10.2 9.9 15.1 17.5 18.3 15.6 12.3 6.211 5.9 6.6 9.5 10.2 10.4 14.8 18.5 17.6 16.0 11.7 7.412 6.5 6.4 9.7 10.4 11.0 14.6 18.7 17.2 15.7 11.5 7.213 7.5 6.8 9.7 10.9 11.2 14.3 18.5 17.5 15.1 11.4 6.714 7.9 7.7 9.5 10.5 12.0 14.1 17.9 18.1 15.0 11.7 7.115 7.2 7.7 9.7 9.9 10.9 14.5 18.1 18.7 13.8 11.2 7.516 7.0 7.9 9.5 10.3 9.9 15.5 18.1 17.7 13.7 11.6 7.717 6.9 7.8 8.7 10.5 9.5 16.7 17.8 18.5 13.2 12.9 7.818 6.4 7.5 8.3 9.9 9.2 16.5 18.2 19.1 13.4 12.7 8.519 6.0 8.0 8.5 9.9 9.9 14.8 18.6 18.7 14.4 13.4 8.820 6.1 8.0 8.8 10.6 11.1 13.6 19.2 17.6 14.1 14.3 7.521 6.7 8.6 9.2 10.6 11.8 13.0 20.5 18.0 14.2 15.3 6.022 6.9 8.6 9.2 10.1 13.4 12.5 20.8 17.8 14.9 15.3 4.623 7.5 7.9 8.7 10.0 14.0 12.4 19.7 16.6 15.4 13.7 4.424 8.0 5.9 8.3 9.3 14.8 12.7 18.6 16.6 15.6 12.2 4.725 8.6 5.0 8.9 9.2 14.2 14.1 18.0 17.0 15.6 11.5 5.326 9.4 5.4 9.3 9.6 13.6 16.2 18.1 17.5 16.5 11.0 5.827 9.2 6.4 8.9 9.9 13.7 17.9 18.4 17.4 17.1 10.9 5.728 8.1 7.0 8.9 10.8 14.8 18.5 19.4 17.2 16.9 11.9 6.029 8.0 — 9.5 11.3 15.1 19.1 20.3 17.5 16.5 11.4 7.230 8.5 — 10.5 12.0 14.9 18.3 20.9 18.2 16.0 9.8 7.531 9.4 — 11.2 — 14.1 — 20.4 18.0 — 7.4 —

MEAN 7.4 7.2 8.7 9.8 11.8 15.5 18.2 17.9 15.9 12.8 6.0 7.5MAX 9.4 9.2 11.2 12.0 15.1 19.1 20.9 19.4 19.2 15.5 8.8 7.5MIN 5.4 5.0 6.7 7.9 9.2 12.4 15.9 16.6 13.2 7.4 3.7 7.4

EFDR – East Fork Dairy Creek at Roy Road [RM 1.24]

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MCKN – 14205980 – MCKAY CREEK AT NORTHRUP ROAD NEAR NORTH PLAINS, OREGON [RM 15.5]Latitude: 45 38 36 Longitude: 122 59 32 Source Agency: District 18 Watermaster



10 5.1 6.1 8.5 9.1 8.8 14.8 17.1 17.3 14.3 11.4 6.911 5.2 5.2 8.6 9.6 10.0 14.7 17.8 17.0 15.2 10.8 8.112 6.5 5.1 9.0 9.7 10.3 13.8 17.7 16.2 15.3 10.8 7.213 7.3 6.2 9.0 9.5 10.8 13.6 17.3 16.4 14.3 11.1 6.114 7.0 7.2 8.9 8.7 11.0 13.6 17.1 17.1 14.0 11.4 6.915 6.3 7.0 8.9 9.0 9.7 14.3 17.4 17.6 13.2 10.3 7.816 6.0 7.4 8.4 9.3 8.9 14.9 17.2 16.6 12.9 10.9 8.017 5.5 6.9 7.4 9.4 8.5 16.0 16.9 17.3 12.6 12.6 7.718 4.9 7.4 7.4 8.5 8.0 15.3 17.4 18.0 13.1 12.5 9.019 4.5 7.7 7.8 9.0 9.3 13.2 17.9 18.0 13.9 12.6 8.220 5.4 7.5 8.7 9.8 10.4 13.0 18.5 16.7 13.4 13.4 6.321 6.1 8.3 8.3 9.6 12.0 12.8 19.6 16.9 13.2 14.5 5.322 6.5 7.6 8.7 9.6 13.1 11.9 19.9 17.0 13.8 14.7 4.123 7.3 6.6 7.9 8.7 14.0 12.2 19.0 15.9 14.1 12.7 4.724 7.6 4.7 7.2 8.4 14.3 12.4 17.8 15.7 14.3 10.7 5.325 8.4 4.1 8.2 8.0 13.5 14.1 17.1 16.4 14.7 10.3 5.426 9.3 4.7 8.3 8.5 13.0 15.9 17.4 16.9 15.1 10.4 5.827 8.2 5.8 7.7 8.8 13.6 17.3 17.5 16.5 15.5 10.8 5.328 7.3 5.8 8.1 9.9 14.9 17.5 18.4 16.1 15.8 12.2 6.229 7.6 — 8.8 10.6 14.7 18.4 19.1 16.6 15.2 11.1 7.530 8.4 — 9.7 10.6 13.9 17.3 19.9 17.3 14.9 9.1 6.631 9.0 — 10.2 — 13.7 — 19.6 17.2 — 6.2 —

MEAN 6.8 6.4 8.0 8.8 11.0 14.9 17.4 17.0 15.0 12.1 6.1 6.9MAX 9.3 8.5 10.2 10.6 14.9 18.4 19.9 18.3 18.2 14.7 9.0 7.1MIN 4.4 4.1 5.6 6.5 8.0 11.9 15.0 15.7 12.6 6.2 4.0 6.7

MCKN – 14205980 – McKay Creek at Northrup Road near North Plains, Oregon [RM 15.5]

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MCSC – 14206070 – MCKAY CREEK AT SCOTCH CHURCH ROAD NEAR HILLSBORO, OREGON [RM 6.3]Latitude: 45 57 21 Longitude: 122 99 18 Source Agency: District 18 Watermaster



10 4.7 5.5 8.3 9.4 9.3 15.9 18.0 18.1 15.2 11.7 5.4 6.011 5.1 5.4 8.6 9.6 10.0 15.6 18.7 17.5 15.9 11.1 6.6 6.212 5.7 5.0 8.8 9.9 10.9 15.1 18.9 17.1 15.5 11.2 6.1 6.813 6.8 5.7 8.8 9.9 11.3 14.9 18.7 17.3 14.7 11.1 5.6 7.314 7.2 6.7 8.7 9.3 11.8 14.6 18.1 17.9 14.6 11.2 6.1 6.715 6.3 7.1 8.9 8.9 11.0 15.0 18.5 18.5 13.6 10.6 6.8 6.316 6.0 7.2 8.6 9.4 9.9 15.8 18.4 17.3 13.2 11.3 6.9 6.317 5.6 7.0 7.8 9.7 9.6 16.8 18.0 18.1 12.8 12.5 7.1 6.818 5.0 6.7 7.3 9.3 9.3 16.4 18.4 18.8 13.2 12.4 8.1 6.419 4.5 7.2 7.6 9.3 10.0 14.5 18.9 18.4 14.2 12.9 8.2 5.520 4.7 7.1 8.1 10.0 10.9 14.0 19.4 17.1 13.5 13.8 7.0 6.121 5.6 7.8 8.7 10.1 12.2 13.4 20.7 17.5 13.4 14.8 5.5 7.122 6.0 7.7 8.6 9.7 13.7 12.7 20.9 17.5 13.9 15.0 4.1 6.723 6.7 6.9 8.2 9.8 14.8 12.9 19.6 16.3 14.3 13.2 4.0 5.824 7.3 4.9 7.2 9.0 15.4 13.2 18.4 16.0 14.4 11.6 4.2 6.225 7.9 4.0 7.8 8.4 15.1 14.3 17.7 16.6 14.5 11.0 4.7 6.526 8.8 4.2 8.2 8.7 14.4 16.2 17.9 17.1 15.3 10.6 5.0 5.627 8.3 5.2 7.9 8.9 14.6 17.8 18.2 17.0 15.7 10.5 4.8 5.328 7.2 5.9 7.9 9.9 15.6 18.3 19.1 16.7 15.8 11.5 5.3 4.929 7.2 — 8.5 10.6 15.9 19.2 20.2 17.1 15.4 10.8 6.3 5.030 7.8 — 9.5 11.3 15.4 18.1 20.7 17.8 15.1 8.9 6.6 4.131 8.9 — 10.4 — 14.8 — 20.2 17.4 — 6.4 — 4.0

MEAN 6.5 6.2 7.9 9.1 11.9 15.8 18.3 17.6 15.3 12.3 5.4 6.2MAX 8.9 8.2 10.4 11.3 15.9 19.2 20.9 19.0 18.7 15.0 8.2 7.3MIN 4.4 4.0 5.8 7.0 9.1 12.7 16.1 16.0 12.8 6.4 3.1 4.0

MCSC – 14206070 – McKay Creek at Scotch Church Road near Hillsboro, Oregon [RM 6.3]

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WCJS – 14206100 – WAIBLE CREEK AT JACKSON SCHOOL ROAD NEAR HILLSBORO, OREGON [RM 1.0]Latitude: 45 33 55 Longitude: 122 58 12 Source Agency: District 18 Watermaster



10 5.4 6.9 9.8 11.7 12.5 19.3 15.3 15.6 13.8 10.9 5.3 6.611 5.8 6.1 9.8 11.7 14.1 18.8 15.6 15.3 14.2 11.1 6.3 7.212 6.5 5.9 9.7 11.5 15.0 18.4 15.8 15.0 14.3 13.0 6.0 8.013 7.4 7.1 9.6 11.2 16.3 18.0 16.0 14.8 13.3 12.6 5.4 8.214 7.8 8.2 9.6 10.3 16.6 18.1 16.0 14.8 12.8 12.7 5.5 7.215 7.3 8.0 9.8 10.8 13.3 17.8 16.0 15.0 12.4 12.3 6.1 7.516 6.9 8.0 9.7 11.5 11.6 18.0 16.0 14.8 12.1 12.6 6.7 7.417 6.3 7.2 8.9 11.6 11.2 18.3 15.8 14.8 11.8 13.5 7.0 8.118 5.7 7.5 8.7 11.5 11.0 18.5 15.6 15.1 12.0 13.2 8.3 6.719 5.2 8.1 8.6 12.2 11.1 17.9 15.7 15.4 12.4 13.8 8.5 6.320 6.0 8.0 9.5 12.6 11.7 17.4 15.8 14.8 12.2 14.5 6.4 7.421 6.7 8.8 9.5 11.5 12.9 17.0 16.0 14.6 11.8 15.0 5.8 8.422 6.7 8.5 9.8 11.9 18.5 16.1 16.4 14.7 11.9 16.8 4.5 7.023 7.4 7.5 9.1 11.1 18.5 16.1 16.5 14.3 12.1 14.6 4.3 6.324 8.1 4.1 8.6 10.5 20.0 15.8 16.2 13.9 12.1 12.7 4.3 7.125 8.9 4.3 9.4 10.2 19.4 15.8 15.7 13.9 12.3 11.8 5.0 7.226 9.9 5.7 9.5 10.8 18.7 16.2 15.5 14.1 12.5 11.1 5.2 6.727 8.7 7.0 9.2 11.9 18.6 16.5 15.4 14.3 12.7 10.7 5.0 6.428 7.9 7.2 9.8 12.4 20.0 16.8 15.5 14.2 12.9 11.3 5.5 6.029 7.9 — 10.8 13.7 19.6 17.2 15.8 14.1 12.9 11.2 7.4 5.630 8.6 — 11.9 13.1 20.1 17.5 16.2 14.2 12.9 9.4 7.1 5.131 9.8 — 12.5 — 20.0 — 16.4 14.3 — 6.7 — 5.6

MEAN 7.3 7.1 9.2 11.1 15.1 18.0 15.8 14.9 13.2 12.4 5.6 7.0MAX 9.9 8.9 12.5 13.7 20.1 19.7 17.3 16.0 15.1 16.8 8.5 8.4MIN 5.1 4.1 6.8 8.2 11.0 15.8 15.1 13.9 11.8 6.7 4.2 5.1

WCJS – 14206100 – Waible Creek at Jackson School Road near Hillsboro, Oregon [RM 1.0]

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MCKH – 14206180 – MCKAY CREEK AT HORNECKER ROAD NEAR HILLSBORO, OREGON [RM 2.2]Latitiude: 45 32 33 Longitude: 123 00 14 Source Agency: District 18 Watermaster


JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 1 18.2 20.3 17.5 15.5 5.5 7.2 2 17.5 19.9 17.6 15.6 5.4 7.2 3 17.6 19.2 18.3 15.5 4.6 7.1 4 18.0 18.9 19.3 15.1 4.3 5 17.8 18.5 19.2 15.0 4.1 6 17.9 18.2 19.0 14.5 3.7 7 18.4 19.0 18.4 14.6 4.3 8 18.2 18.9 16.9 14.3 5.1 9 18.3 19.2 16.0 13.3 5.6

10 19.3 19.3 15.9 12.5 5.911 20.0 18.7 16.4 11.9 7.012 20.2 18.1 16.2 11.7 6.713 15.8 20.0 18.3 15.4 11.8 5.914 15.6 19.5 18.9 15.3 11.9 6.415 16.2 20.0 19.4 14.5 11.3 7.216 17.1 19.8 18.2 14.2 11.8 7.417 18.3 19.4 18.8 13.7 13.2 7.518 17.7 19.9 19.6 13.9 13.3 8.319 15.6 20.3 19.4 14.8 13.6 8.620 14.9 20.7 18.3 14.4 14.2 7.621 14.6 22.0 18.6 14.2 15.1 6.622 13.8 22.2 18.6 14.6 15.5 4.923 13.8 21.1 17.6 14.8 14.1 4.824 14.2 20.0 17.2 15.1 12.4 4.825 15.4 19.3 17.5 15.2 11.6 5.226 17.4 19.4 17.9 15.8 11.2 5.427 19.0 19.6 18.0 16.3 11.0 5.228 19.7 20.5 17.7 16.4 11.9 5.729 — 20.6 21.4 18.0 16.3 11.6 6.730 — 19.6 22.1 18.7 15.9 9.9 6.831 — — — 21.6 18.4 — 7.4 —

MEAN 16.6 19.7 18.6 16.1 13.0 5.9 7.2MAX 20.6 22.2 20.3 19.3 15.6 8.6 7.2MIN 13.8 17.5 17.2 13.7 7.4 3.7 7.1

MCKH – 14206180 – McKay Creek at Hornecker Road near Hillsboro, Oregon [RM 2.2]

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DAIRY – 14206200 – DAIRY CREEK AT HWY 8 NEAR HILLSBORO, OREGON [RM 2.06]Latitude: 45 30 38 Longitude: 123 06 56 Source Agency: District 18 Watermaster



10 4.6 5.6 8.5 10.6 10.1 16.5 18.7 18.8 15.9 12.2 5.7 6.311 4.8 5.9 9.0 10.5 10.7 16.1 19.4 18.3 16.3 11.7 6.8 6.212 5.3 5.6 9.3 10.7 11.5 15.6 19.5 17.9 16.0 11.6 6.4 6.613 6.3 5.9 9.4 10.7 11.9 15.2 19.3 18.2 15.6 11.5 6.014 7.0 6.6 9.2 10.3 12.4 15.1 18.7 18.7 15.3 11.6 6.415 6.7 7.1 9.4 9.7 12.0 15.5 19.2 19.1 14.3 11.2 6.9 6.416 6.1 7.2 9.3 10.2 10.7 16.3 19.2 18.0 14.0 11.6 7.217 5.8 7.3 8.9 10.5 10.1 17.4 18.7 18.9 13.6 12.7 7.318 5.2 6.8 8.4 10.2 9.9 17.2 19.3 19.6 13.8 12.8 7.8 6.319 4.7 7.3 8.3 10.0 10.4 15.5 19.7 19.3 14.5 13.2 8.1 5.620 4.9 7.4 8.4 10.7 11.4 14.6 20.2 18.1 14.2 14.1 7.2 5.721 5.4 7.7 9.0 10.7 12.4 14.1 21.3 18.5 14.3 15.0 6.322 6.0 8.1 9.1 10.3 13.6 13.3 21.6 18.4 14.6 15.3 4.823 6.4 7.7 8.9 10.3 14.9 13.2 20.6 17.3 15.0 14.1 4.4 6.024 7.2 6.0 8.4 9.5 15.7 13.4 19.6 17.2 15.4 12.6 4.4 6.025 7.9 4.6 8.5 9.2 15.5 14.7 18.9 17.6 15.5 11.7 4.7 6.326 8.8 4.5 9.0 9.4 14.7 16.6 18.9 18.0 16.2 11.3 4.9 5.927 9.0 5.3 9.1 9.9 14.8 18.3 19.3 17.8 16.5 11.1 4.828 7.9 6.2 9.1 10.8 15.7 19.3 20.3 17.6 16.6 12.0 5.329 7.3 — 9.6 11.4 16.2 19.9 21.1 18.0 16.2 11.3 6.330 7.8 — 10.6 12.3 16.0 19.0 21.8 18.7 15.9 9.7 6.4 4.231 8.9 — 11.4 — 15.3 — 21.3 18.5 — 7.5 — 3.7

MEAN 6.6 6.7 8.5 9.9 12.5 16.4 19.2 18.5 16.1 12.9 5.7 6.2MAX 9.0 9.1 11.4 12.3 16.2 19.9 21.8 20.2 19.4 15.6 8.1 6.9MIN 4.6 4.5 6.1 7.6 9.9 13.2 17.1 17.2 13.6 7.5 3.7 3.7

DAIRY – 14206200 – Dairy Creek at Hwy 8 near Hillsboro, Oregon [RM 2.06]

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RCRR – 14206305 – ROCK CREEK AT ROCK CREEK ROAD NEAR BOWERS JUNCTION, OREGON [RM 15.8]Latitude: 45 37 04 Longitude: 122 53 13 Source Agency: District 18 Watermaster



10 4.3 5.2 7.7 9.2 9.3 13.9 16.2 16.1 14.1 11.0 5.8 5.611 4.4 4.5 8.2 9.6 10.4 14.0 16.7 15.4 15.2 10.0 7.5 5.912 5.2 4.6 8.5 9.5 10.7 13.2 16.8 15.0 14.0 10.8 5.5 6.613 6.0 5.8 8.5 9.1 11.2 13.4 16.6 15.2 12.9 10.4 5.3 6.814 6.2 6.4 8.5 8.7 11.4 12.9 15.9 16.6 13.2 10.7 6.5 6.515 5.9 6.1 8.6 8.9 9.7 13.4 16.3 16.8 11.6 9.5 7.1 6.316 5.4 6.4 8.4 9.5 8.9 14.3 16.2 15.8 11.5 10.9 7.3 6.217 4.7 6.3 7.6 9.5 8.6 15.6 15.9 16.8 11.2 13.1 7.1 6.518 4.1 6.7 7.5 9.1 8.0 14.4 16.4 17.5 12.0 11.7 8.7 5.619 3.6 7.0 7.6 9.6 9.9 12.0 16.7 16.3 13.3 12.5 7.5 5.520 4.6 7.0 8.2 10.4 10.9 12.3 17.2 14.7 12.1 13.8 5.9 6.221 4.9 7.6 8.1 10.0 12.6 12.0 19.1 15.8 12.1 15.0 4.7 6.822 5.3 7.2 8.2 10.1 14.0 11.4 18.7 15.2 13.2 14.7 3.1 5.823 5.5 6.2 7.7 9.3 14.8 11.6 17.2 14.0 13.1 11.2 4.1 5.724 6.4 4.1 7.1 8.9 15.0 11.4 15.7 14.5 13.6 9.5 4.5 6.025 7.3 4.0 7.9 8.6 13.8 13.0 15.3 15.4 13.9 9.8 5.1 5.826 8.0 4.3 8.1 8.6 13.0 15.2 15.6 15.5 15.2 9.9 5.2 5.327 7.5 5.0 7.8 8.9 14.0 16.5 16.2 15.0 16.0 10.1 4.5 5.228 7.0 5.1 7.9 10.0 15.4 16.9 17.4 15.0 15.6 11.9 5.8 5.229 7.1 — 8.8 10.7 14.8 17.8 18.5 15.9 14.6 9.5 7.1 4.830 7.5 — 10.0 10.9 13.8 16.4 18.9 17.1 13.9 6.8 6.0 4.131 8.3 — 10.5 — 13.5 — 17.8 15.5 — 3.4 — 4.2

MEAN 5.9 5.9 7.6 9.0 11.5 14.3 16.1 15.8 14.1 11.4 5.2 5.9MAX 8.3 8.2 10.5 10.9 15.4 18.2 19.1 17.5 18.0 15.0 8.7 6.8MIN 3.6 4.0 4.9 6.8 8.0 11.4 13.2 14.0 11.2 3.4 2.6 4.1

RCRR – 14206305 – Rock Creek at Rock Creek Road near Bowers Junction, Oregon [RM 15.8]

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RCWU – 14206338 – ROCK CREEK AT WEST UNION ROAD NEAR BETHANY, OREGON [RM 9.0]Latitude: 45 33 34 Longitude: 122 52 30 Source Agency: District 18 Watermaster



10 4.6 5.6 9.3 11.0 10.7 16.1 16.1 17.3 15.5 12.2 6.6 6.311 4.8 5.5 9.6 11.2 11.4 16.0 16.5 17.1 16.0 11.7 8.1 6.512 5.8 5.5 9.8 11.4 12.3 15.4 16.8 16.6 15.6 11.9 6.7 7.213 6.7 6.5 9.8 11.3 12.8 15.3 17.1 16.4 14.7 11.5 6.1 7.714 7.3 7.3 9.8 10.4 13.3 15.0 16.8 16.7 14.7 11.7 6.9 6.915 6.6 7.5 10.1 10.3 12.3 15.2 16.8 17.7 13.6 11.1 7.2 6.716 6.3 7.8 9.7 10.8 11.2 15.7 17.1 16.7 13.5 11.7 7.5 6.517 5.7 7.4 8.9 11.2 10.6 16.7 16.6 16.9 13.1 12.9 7.5 7.018 5.0 7.3 8.3 10.8 10.6 16.2 16.7 17.4 13.1 12.4 8.4 6.619 4.4 7.8 8.3 11.1 11.7 14.6 17.0 17.6 14.1 13.0 8.6 6.220 4.7 7.7 9.0 11.7 12.6 14.3 17.3 16.3 13.3 13.6 7.1 6.721 5.3 8.4 9.4 11.5 13.7 13.9 18.2 16.5 13.1 14.5 6.1 7.522 5.7 8.2 9.6 11.1 15.1 13.4 18.6 16.7 13.8 14.7 4.5 6.823 6.6 7.4 8.9 11.0 16.1 13.4 18.4 15.8 13.6 12.8 4.7 6.324 7.2 4.9 8.0 10.2 16.7 13.4 17.5 15.5 14.1 11.1 4.9 6.525 8.2 3.9 8.7 9.6 16.0 14.2 16.8 15.8 14.1 10.8 5.1 6.826 9.4 4.4 9.1 10.0 15.3 15.5 16.9 16.3 15.3 10.8 5.4 6.127 8.7 5.5 8.7 10.2 15.6 16.6 16.9 16.2 15.8 10.6 5.1 5.928 8.0 6.0 9.0 11.5 16.9 17.0 17.6 15.6 15.6 12.2 5.5 5.529 7.9 — 9.9 12.2 16.8 17.8 18.3 15.9 15.1 10.9 6.7 4.930 8.4 — 11.1 12.5 16.5 17.7 18.7 16.8 14.4 8.5 7.1 4.031 9.7 — 12.1 — 15.8 — 18.7 16.5 — 5.2 — 4.2

MEAN 6.7 6.6 8.7 10.5 13.2 16.0 16.8 16.8 15.0 12.2 5.9 6.5MAX 9.7 9.1 12.1 12.5 16.9 19.4 18.7 17.9 17.7 14.7 8.6 7.7MIN 4.4 3.9 6.2 7.8 10.5 13.4 15.2 15.5 13.1 5.2 3.8 4.0

RCWU – 14206338 – Rock Creek at West Union Road near Bethany, Oregon [RM 9.0]

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RCQR – 14206347 – ROCK CREEK AT QUATAMA ROAD NEAR ORENCO, OREGON [RM 4.9]Latitude: 45 31 25 Longitude: 122 54 34 Source Agency: District 18 Watermaster



10 4.9 5.8 9.4 11.6 11.4 17.7 19.2 19.7 17.7 13.8 6.9 7.111 5.2 5.7 9.9 11.6 12.0 17.2 19.7 18.9 17.7 12.8 8.0 7.112 6.2 5.8 10.2 11.4 12.9 16.8 20.1 18.6 17.0 12.9 7.9 7.813 6.9 6.7 10.2 11.5 13.4 16.4 20.0 18.5 16.2 12.8 7.1 8.214 7.6 7.6 10.1 11.0 14.3 16.3 19.5 18.9 15.7 12.9 7.5 7.215 7.0 7.9 10.4 10.6 13.1 16.7 19.7 19.6 14.9 12.2 8.0 6.916 6.6 8.3 10.1 11.1 12.3 17.5 19.6 18.5 14.7 13.1 8.7 6.917 6.0 7.8 9.5 11.5 11.9 18.3 19.2 19.0 14.4 14.3 8.9 7.318 5.4 7.3 9.0 11.2 11.6 18.0 19.6 19.5 14.7 14.3 9.6 7.019 4.8 8.0 8.8 11.4 12.5 16.4 19.9 19.1 15.6 14.6 9.2 6.620 5.0 8.0 9.2 12.1 13.7 15.9 20.3 18.2 14.7 15.7 7.8 7.121 5.5 8.5 9.6 12.0 14.7 15.2 21.5 18.8 14.6 16.6 7.0 7.922 6.3 8.7 9.9 11.6 16.2 14.7 21.6 18.5 14.8 16.6 5.7 7.223 6.9 7.9 9.3 11.5 17.1 14.6 20.6 17.4 15.0 15.2 5.6 6.824 7.6 5.7 8.5 10.9 18.0 14.9 19.7 17.3 15.2 13.2 6.3 7.025 8.4 4.4 8.9 10.3 17.4 16.0 19.1 17.8 15.3 12.1 6.4 6.926 9.8 4.7 9.3 10.5 16.5 17.5 19.3 18.2 16.0 11.8 6.7 6.627 9.3 5.7 9.2 10.7 16.9 18.8 19.6 18.0 16.2 11.7 6.3 6.328 8.5 6.4 9.3 11.8 18.0 19.5 20.2 17.5 16.5 12.7 6.6 5.929 8.2 — 10.0 12.5 18.3 20.4 20.7 17.9 16.0 12.1 8.6 5.330 8.7 — 11.1 13.1 17.5 19.6 21.3 18.4 15.8 10.7 7.9 4.531 9.9 — 12.1 — 16.5 — 21.2 17.9 — 8.2 — 4.5

MEAN 7.1 7.0 9.1 10.9 14.1 17.5 19.5 18.7 16.3 13.8 6.9 7.1MAX 9.9 9.2 12.1 13.1 18.3 20.7 21.6 20.4 19.1 16.6 9.6 8.5MIN 4.8 4.4 6.6 8.5 11.3 14.6 17.7 17.3 14.4 8.2 4.7 4.5

RCQR – 14206347 – Rock Creek at Quatama Road near Orenco, Oregon [RM 4.9]

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BCCH – 14206360 – BEAVERTON CREEK AT CEDAR HILLS BLVD AT BEAVERTON, OREGON [RM 7.45]Latitude: 45 49 31 Longitude: 122 81 05 Source Agency: District 18 Watermaster



10 6.7 8.8 10.7 12.0 12.2 16.6 21.0 19.8 17.0 13.9 9.4 8.111 7.0 8.1 10.8 12.3 13.2 17.6 21.1 19.0 17.6 13.1 10.6 8.712 7.6 8.2 11.1 12.1 13.5 16.5 20.8 19.0 17.0 14.0 9.2 9.113 8.7 9.1 11.2 12.1 14.3 16.6 20.1 19.4 16.7 13.7 8.6 9.014 9.1 10.0 10.9 11.5 14.0 16.7 20.0 20.3 16.4 13.8 10.0 8.015 8.5 9.5 11.2 11.8 13.0 18.0 20.6 19.1 14.9 12.7 10.3 8.816 8.2 9.4 10.9 12.1 12.1 18.9 20.2 19.0 15.4 13.9 10.1 8.717 7.9 8.3 10.3 11.8 11.3 19.8 20.1 20.4 15.4 15.4 10.2 9.118 7.3 9.0 10.0 11.6 11.9 17.6 20.8 20.9 15.9 14.5 11.4 8.319 6.9 9.6 10.1 12.0 13.4 15.5 21.2 20.0 16.5 15.3 9.0 7.920 7.4 9.4 10.8 12.5 13.8 15.6 21.5 19.0 15.6 16.4 8.3 8.921 7.8 10.2 10.5 11.9 15.4 15.5 22.8 19.8 15.8 17.3 8.4 9.522 7.9 9.9 10.8 11.9 16.3 14.8 22.2 18.6 16.7 16.7 6.9 8.523 8.8 8.9 10.2 11.7 17.4 14.7 20.6 18.2 16.5 14.6 7.7 8.024 9.5 6.1 9.7 11.6 17.0 16.2 20.0 18.7 17.2 12.5 8.3 8.125 10.4 6.4 10.6 11.4 15.9 18.1 20.0 19.4 17.3 12.4 7.8 8.026 11.7 7.3 9.9 11.5 15.7 19.9 20.4 18.9 18.0 12.6 8.5 7.927 10.3 8.6 10.4 12.2 17.1 20.8 20.7 18.4 18.0 13.0 8.1 7.128 9.7 8.5 10.9 12.6 17.8 20.8 21.7 18.7 18.0 14.4 8.7 7.329 9.2 — 11.6 13.2 17.6 21.0 22.3 19.4 16.8 13.0 9.9 6.030 10.2 — 12.4 12.6 16.1 19.5 22.5 20.0 16.7 10.1 9.7 6.531 11.1 — 12.7 — 16.5 — 21.7 19.3 — 6.9 — 6.3

MEAN 8.7 8.8 10.3 11.6 14.2 17.9 20.5 19.4 17.3 14.3 8.4 8.4MAX 11.7 10.5 12.7 13.2 17.8 21.0 22.8 20.9 20.8 17.3 11.4 9.7MIN 6.7 6.1 8.3 9.4 11.3 14.7 18.0 18.2 14.9 6.9 5.9 6.0

BCCH – 14206360 – Beaverton Creek at Cedar Hills Blvd at Beaverton, Oregon [RM 7.45]

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ECMR – 14206365 – ERICKSON CREEK AT MENLO DRIVE AT BEAVERTON, OREGON [RM 0.76]Latitude: 45 29 14 Longitude: 122 58 54 Source Agency: District 18 Watermaster



10 7.1 8.6 11.1 12.3 12.5 16.5 18.3 19.2 17.1 14.1 8.9 8.711 7.4 7.8 11.0 12.5 13.5 16.9 18.7 18.7 17.5 13.6 10.3 9.212 7.9 7.9 11.1 12.2 13.8 16.3 18.8 18.2 16.7 14.4 9.0 9.513 9.1 9.0 11.2 12.2 14.1 16.3 18.8 18.1 15.6 14.0 8.4 9.314 9.5 9.7 11.0 11.8 14.2 16.4 18.1 18.5 15.5 14.3 9.6 8.515 9.1 9.4 11.3 12.2 13.1 16.6 18.7 19.0 14.7 13.4 10.3 9.516 8.7 9.3 11.0 12.5 12.1 17.3 18.4 18.2 15.4 14.4 10.3 9.517 8.2 8.3 10.4 12.4 11.6 18.2 18.0 18.7 15.5 15.5 10.4 9.618 7.7 9.6 10.1 12.1 12.4 17.3 18.3 19.1 15.0 14.9 11.6 9.019 7.2 9.9 10.1 12.5 13.6 15.4 18.8 18.6 16.0 15.7 9.2 8.620 7.9 9.6 10.9 13.0 14.3 15.4 19.1 17.3 14.8 16.4 8.6 9.321 8.1 10.4 10.7 12.1 15.5 15.4 20.3 17.9 14.6 17.1 8.9 9.822 8.0 9.9 10.9 12.4 16.5 14.7 20.2 17.9 15.3 17.1 7.3 9.023 9.1 9.0 10.4 12.1 17.2 14.7 19.0 16.9 15.1 14.9 8.1 8.824 9.8 6.5 10.1 12.1 17.4 15.1 18.2 16.9 15.5 13.0 8.6 8.425 10.6 6.7 10.8 11.8 16.3 16.3 17.7 17.3 15.5 12.6 8.3 8.526 11.7 7.5 10.0 12.0 15.8 17.9 18.1 18.0 16.3 12.6 8.7 8.627 10.3 8.6 10.6 12.5 16.6 18.7 18.2 17.8 16.3 12.8 8.2 7.328 9.8 8.6 11.1 13.1 17.8 19.0 19.2 17.2 16.2 14.2 8.9 7.829 9.3 — 11.8 13.6 17.4 19.5 19.8 17.3 16.2 13.1 10.3 7.030 10.5 — 12.7 13.3 16.6 18.3 20.2 18.0 15.9 10.6 10.0 7.431 11.3 — 12.8 — 16.2 — 20.4 17.6 — 7.2 — 7.0

MEAN 9.1 8.9 10.4 12.0 14.3 17.0 18.4 18.3 16.3 14.4 8.5 8.9MAX 11.7 10.7 12.8 13.6 17.8 19.7 20.4 20.2 18.9 17.1 11.6 10.1MIN 7.1 6.5 8.3 9.5 11.6 14.7 16.6 16.9 14.6 7.2 6.1 7.0

ECMR – 14206365 – Erickson Creek at Menlo Drive at Beaverton, Oregon [RM 0.76]

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JCDV – 14206372 – JOHNSON CREEK AT DAVIS ROAD NEAR BEAVERTON, OREGON [RM 1.3]Latitude: 45 28 30 Longitude: 122 49 52 Source Agency: District 18 Watermaster



10 6.6 7.4 11.0 12.6 12.6 19.2 24.7 21.0 17.2 13.7 8.3 8.311 6.6 7.1 11.0 12.8 13.7 19.3 25.1 21.0 18.7 12.7 9.2 8.812 7.6 7.0 11.1 12.4 14.8 19.0 25.1 20.9 18.8 13.2 8.7 9.413 8.9 8.2 11.2 11.9 15.8 18.6 24.1 21.3 18.4 13.5 8.6 9.314 9.4 9.4 11.0 11.2 15.9 18.7 23.7 22.9 18.1 13.9 9.1 8.215 8.5 9.1 11.3 11.7 14.6 20.0 24.0 21.6 17.4 12.8 9.0 8.816 8.2 9.1 10.9 12.1 12.1 21.4 23.5 20.9 17.2 13.4 9.2 8.717 7.7 8.2 10.1 12.4 11.1 23.0 23.5 22.6 17.1 15.4 9.2 9.218 7.2 9.1 9.5 11.8 12.5 21.1 24.5 23.1 17.8 15.9 10.5 8.419 6.5 9.6 9.6 12.5 14.4 18.3 25.2 22.8 18.2 15.7 9.2 8.020 6.9 9.3 10.6 13.3 15.6 17.7 25.6 21.5 17.7 16.6 8.1 8.921 7.3 10.3 10.7 12.0 17.5 17.4 26.4 22.8 17.7 18.0 7.7 9.622 7.6 9.7 10.8 12.7 19.5 16.7 26.2 21.8 18.3 18.1 6.2 8.523 8.6 8.8 9.9 11.9 20.6 16.2 25.4 20.8 18.7 16.1 6.9 8.124 9.6 6.1 9.3 11.5 20.5 17.2 24.2 21.5 20.4 13.9 7.6 8.225 10.7 5.8 10.5 11.0 19.5 19.3 24.0 22.4 19.9 13.1 7.3 8.226 11.8 6.4 10.1 11.4 19.0 22.0 23.9 22.3 20.2 13.6 7.7 7.927 10.5 8.0 10.3 12.3 20.0 23.9 24.2 21.2 20.9 13.9 7.4 6.828 9.6 7.9 10.9 13.2 21.5 24.0 25.6 20.9 21.4 15.1 8.1 7.529 9.2 — 11.7 13.6 21.1 25.3 26.4 21.8 19.7 13.4 10.0 6.730 10.3 — 12.9 12.9 19.7 23.1 26.7 22.6 19.2 11.0 9.8 6.431 11.1 — 13.4 — 19.3 — 25.8 21.8 — 7.9 — 6.3

MEAN 8.7 8.2 10.2 11.7 15.7 20.6 24.2 22.0 19.5 15.1 7.8 8.5MAX 11.8 10.3 13.4 13.6 21.5 25.3 26.7 24.9 24.1 19.4 10.5 9.7MIN 6.5 5.8 7.6 8.8 11.1 16.2 20.9 20.2 16.5 7.9 5.6 6.3

JCDV – 14206372 – Johnson Creek at Davis Road near Beaverton, Oregon [RM 1.3]

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CMMB – 14206395 – CEDAR MILL CREEK AT MURRAY BOULEVARD NEAR BEAVERTON, OREGON [RM 1.64]Latitude: 45 30 37 Longitude: 122 49 18 Source Agency: District 18 Watermaster



10 5.0 6.7 9.4 11.4 11.6 17.4 19.0 19.1 16.4 13.3 7.3 7.011 5.4 6.6 9.9 11.5 11.9 17.3 19.7 18.8 16.7 12.7 8.3 7.112 6.5 6.6 10.1 11.4 12.7 17.0 19.7 18.3 16.5 12.6 7.9 7.713 7.6 7.3 10.3 11.3 13.0 16.5 19.2 18.1 15.8 12.5 7.6 8.114 8.2 8.1 10.3 11.1 13.9 16.2 18.8 18.5 15.9 12.7 8.2 7.515 7.4 8.4 10.5 10.9 13.2 16.5 19.3 19.2 15.0 12.0 8.7 7.416 7.0 8.6 10.3 11.2 12.3 17.2 19.3 18.3 14.7 12.5 8.8 7.217 6.7 8.1 9.8 11.3 11.4 18.2 18.9 18.7 14.5 13.8 8.7 7.618 6.1 8.1 9.4 11.1 11.0 18.1 19.3 19.3 14.6 14.0 9.4 7.219 5.3 8.5 9.3 11.2 11.7 16.4 19.8 19.4 15.3 14.3 9.2 6.720 5.9 8.5 9.4 11.7 12.8 15.4 20.2 18.1 15.0 15.1 8.1 7.221 6.5 8.9 9.7 11.7 13.6 15.1 21.0 18.2 14.8 16.1 7.4 8.122 6.8 9.0 9.8 11.3 15.2 14.6 21.2 18.4 15.3 16.5 6.0 7.623 7.6 8.5 9.6 11.3 16.2 14.6 20.7 17.4 15.5 14.9 5.9 6.924 8.6 6.5 9.0 10.9 17.3 14.8 19.7 17.1 15.9 13.1 6.4 7.025 9.7 5.3 9.3 10.6 16.6 16.1 19.2 17.5 16.2 12.6 6.4 7.026 10.9 5.5 9.4 10.6 16.0 17.8 19.3 18.3 16.8 12.4 6.6 6.627 9.7 6.2 9.4 10.7 16.2 19.1 19.3 18.1 17.1 12.5 6.5 6.328 9.1 6.8 9.6 11.6 17.6 19.5 19.7 17.5 17.3 13.5 6.9 6.229 8.9 — 10.1 11.8 17.6 20.1 20.5 17.5 17.2 12.7 8.1 5.430 9.1 — 10.9 11.6 17.5 19.1 21.2 18.2 16.3 10.7 8.2 4.931 9.9 — 11.8 — 16.5 — 21.1 18.2 — 8.0 — 4.8

MEAN 7.6 7.6 9.3 10.8 13.7 17.4 19.3 18.5 16.5 13.8 7.1 7.2MAX 10.9 9.7 11.8 11.8 17.6 20.3 21.2 20.2 19.5 16.5 9.4 8.3MIN 5.0 5.3 7.3 8.9 11.0 14.6 17.0 17.1 14.5 8.0 5.3 4.8

CMMB – 14206395 – Cedar Mill Creek at Murray Boulevard near Beaverton, Oregon [RM 1.64]

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WC143 – 14206410 – WILLOW CREEK AT 143RD AVENUE NEAR BEAVERTON, OREGON [RM 3.5]Latitude: 45 32 12 Longitude: 122 49 24 Source Agency: District 18 Watermaster



10 4.6 7.2 10.7 13.6 13.5 18.8 22.4 21.8 18.3 15.0 7.7 6.811 4.7 6.6 10.9 13.6 14.3 19.4 22.8 21.1 18.5 13.8 8.8 7.112 6.0 6.7 10.9 13.4 15.1 18.8 22.7 20.8 18.4 13.5 7.9 7.613 7.4 7.5 11.0 12.5 16.1 17.9 21.8 21.1 18.2 13.6 7.6 8.214 8.2 8.3 11.0 12.0 16.6 18.8 21.6 22.1 18.0 13.7 8.6 7.515 7.4 8.5 11.3 11.8 15.2 19.8 22.2 21.6 16.8 12.8 8.9 7.216 6.9 8.6 11.1 12.7 14.6 20.9 22.0 20.8 16.4 13.5 8.7 7.017 6.4 8.2 10.8 12.9 14.1 21.7 21.7 21.8 16.4 15.1 8.6 7.518 5.8 8.3 10.3 12.5 14.4 20.4 22.6 22.4 16.9 15.2 9.8 6.619 5.4 8.8 10.0 13.0 15.6 18.0 23.0 22.0 17.6 15.6 9.3 6.120 5.7 8.6 10.5 14.3 16.7 17.4 23.5 20.9 17.1 16.5 7.6 6.921 6.0 9.2 10.3 13.4 17.7 17.1 24.2 21.7 17.0 18.1 6.9 8.022 6.3 9.0 10.7 12.9 18.2 16.7 24.2 21.2 17.6 17.8 5.4 6.823 7.3 8.2 10.4 12.8 20.5 16.5 23.3 20.2 17.9 15.4 6.3 6.024 8.3 4.8 9.9 12.3 20.5 17.1 22.5 20.3 18.6 13.8 6.5 6.425 9.4 4.5 10.4 11.6 19.2 18.9 22.0 21.0 18.8 13.3 6.5 6.826 10.6 5.5 10.4 11.8 18.6 21.1 22.2 21.1 19.4 13.6 6.6 6.427 10.3 6.9 10.3 12.4 19.7 21.9 22.5 20.4 19.4 13.8 6.4 6.128 9.7 7.2 11.0 13.8 20.9 22.8 23.6 20.2 19.6 14.9 7.2 5.929 9.1 — 12.1 14.6 20.4 22.9 24.4 20.9 18.8 13.3 8.7 5.330 9.6 — 13.7 14.0 18.9 21.4 24.9 21.6 18.2 10.3 8.1 4.331 10.8 — 14.5 — 18.6 — 24.0 21.1 — 6.6 — 4.4

MEAN 7.6 7.7 10.2 12.4 16.4 19.9 22.3 21.4 18.8 14.9 7.0 6.9MAX 10.8 10.3 14.5 14.6 20.9 23.9 24.9 23.2 22.7 18.2 9.8 8.3MIN 4.6 4.5 7.1 9.4 13.5 16.5 19.7 20.2 16.4 6.6 4.7 4.3

WC143 – 14206410 – Willow Creek at 143rd Avenue near Beaverton, Oregon [RM 3.5]

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WCHP – 14206413 – WILLOW CREEK AT HERITAGE PARKWAY NEAR BEAVERTON, OREGON [RM 0.75]Latitude: 45 31 12 Longitude: 122 51 35 Source Agency: District 18 Watermaster



10 6.2 7.5 11.2 12.9 12.7 17.8 20.9 20.6 17.5 14.2 8.1 7.611 6.3 6.9 11.3 13.1 13.7 18.3 21.4 19.8 18.1 13.1 9.2 8.112 6.9 7.0 11.2 12.6 14.3 17.0 20.9 19.5 17.6 13.3 8.3 8.713 8.2 8.2 11.3 12.3 15.2 17.5 20.7 19.8 16.7 13.2 7.2 8.814 8.8 9.0 11.2 11.9 15.1 17.6 20.6 20.3 16.2 13.5 8.3 7.715 8.4 8.8 11.4 12.1 14.0 18.4 20.9 20.0 15.2 12.5 8.9 8.016 7.9 9.1 11.1 12.7 13.4 19.2 20.7 19.4 15.3 13.5 9.3 8.017 7.3 8.1 10.3 12.5 12.9 20.1 20.5 20.4 15.7 15.0 9.2 8.418 6.8 8.7 10.0 12.5 13.2 18.6 20.9 20.8 15.6 14.5 10.5 7.919 6.1 9.3 9.9 12.8 14.4 16.5 21.5 20.3 16.4 15.2 9.1 7.620 6.7 9.1 10.7 13.6 15.1 16.3 21.9 19.2 15.5 16.2 8.0 8.221 7.2 9.9 10.5 12.7 16.8 16.2 23.1 19.2 15.4 17.4 7.6 8.922 7.2 9.7 10.9 12.7 18.0 15.6 22.9 19.0 15.9 16.7 6.1 8.123 8.1 8.6 10.4 12.3 19.2 15.3 21.7 18.4 15.8 15.1 6.9 7.824 9.1 5.9 9.7 11.8 18.9 16.2 20.7 18.4 16.1 12.9 7.2 7.625 10.1 5.6 10.5 11.6 18.0 17.9 20.3 18.7 16.2 12.3 6.9 7.526 11.4 6.1 10.1 11.9 17.2 19.8 20.5 19.2 17.1 12.2 7.3 7.527 10.5 7.4 10.3 12.6 18.5 21.1 20.9 18.8 17.2 12.2 7.2 7.028 9.7 7.6 10.9 13.6 19.5 21.4 21.6 18.6 17.1 13.5 8.0 6.729 9.1 — 11.7 14.2 19.3 21.6 22.4 19.0 16.8 12.6 9.4 5.830 9.9 — 12.8 13.2 17.6 20.5 22.7 19.6 16.2 10.3 8.9 5.831 11.1 — 13.5 — 17.7 — 22.1 19.0 — 6.9 — 5.9

MEAN 8.3 8.1 10.3 12.1 15.4 18.6 20.8 19.7 17.1 14.1 7.5 7.9MAX 11.4 10.3 13.5 14.2 19.5 22.4 23.1 21.2 20.3 17.4 10.5 9.2MIN 6.1 5.6 7.7 9.5 12.7 15.3 18.7 18.4 15.2 6.9 5.2 5.8

WCHP – 14206413 – Willow Creek at Heritage Parkway near Beaverton, Oregon [RM 0.75]

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BCSR – 14206419 – BRONSON CREEK AT SALTZMAN ROAD NEAR ORENCO, OREGON [RM 5.1]



JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 1 8.0 9.4 7.4 9.3 10.8 14.0 14.7 17.1 15.2 14.5 5.1 7.8 2 8.8 9.0 6.4 8.0 11.4 13.1 13.9 17.2 15.8 15.0 5.3 8.2 3 8.9 8.3 7.1 7.8 10.4 13.8 14.2 16.7 16.8 15.0 4.9 7.5 4 9.3 7.0 6.7 8.0 10.2 15.0 14.8 15.9 17.5 14.6 5.3 6.8 5 7.7 6.5 7.9 7.5 10.2 16.4 14.7 16.3 17.5 14.7 5.1 8.4 6 6.3 7.9 8.3 10.2 17.5 15.1 16.2 17.2 13.8 5.1 8.1 7 5.9 8.0 9.3 9.4 17.7 15.4 16.9 16.8 14.3 5.8 7.7 8 5.8 7.9 10.4 9.5 16.3 15.5 16.6 14.9 13.5 6.1 7.8 9 5.6 10.1 9.9 14.3 15.7 17.1 14.5 12.2 7.0 6.9

10 6.8 10.3 10.0 14.3 16.5 16.9 15.0 11.6 7.7 6.811 6.4 10.7 10.7 14.4 17.0 16.3 15.8 11.3 8.6 7.212 6.6 10.7 11.1 13.9 17.1 15.7 14.8 11.8 7.2 8.213 7.9 10.3 11.5 13.9 17.0 15.6 13.9 11.4 7.4 8.414 8.0 8.5 9.6 11.4 13.6 16.1 16.5 14.4 11.7 8.3 7.515 7.1 8.6 9.8 10.3 13.9 16.6 17.5 13.0 10.9 8.8 7.216 6.8 8.5 10.1 9.4 14.7 16.8 16.2 12.8 12.1 8.9 7.217 6.2 7.9 10.0 9.0 15.9 16.2 16.8 12.3 13.4 8.8 7.818 6.0 8.3 9.4 8.9 14.8 16.7 17.4 12.5 13.1 10.1 6.919 5.4 8.5 9.9 10.4 12.9 17.0 17.1 13.8 13.7 8.7 6.720 6.0 8.3 10.7 11.2 13.1 17.3 14.9 12.8 14.4 7.2 7.721 6.4 9.2 10.2 12.4 12.8 19.0 16.1 12.8 15.3 6.1 8.522 6.9 8.2 10.2 13.3 12.3 18.7 16.4 13.7 15.6 4.4 7.023 7.6 6.9 9.8 14.0 12.5 17.6 14.8 14.0 12.5 5.6 6.724 8.5 4.4 9.4 14.2 12.6 16.3 14.7 14.4 11.2 6.1 7.425 9.3 4.4 9.0 13.5 13.8 15.9 15.3 14.4 11.1 6.6 7.326 10.1 5.3 8.9 9.3 12.9 15.8 16.1 16.3 15.1 11.2 6.7 6.327 9.1 6.5 8.5 9.6 13.7 16.7 16.3 16.2 15.6 11.5 6.2 6.328 8.4 6.7 8.8 10.8 14.9 17.1 17.5 15.6 15.8 12.5 7.3 6.429 8.5 — 9.7 10.8 14.6 17.9 18.3 15.8 15.6 11.0 9.0 5.630 9.4 — 10.8 10.9 14.0 16.5 18.7 16.7 14.8 8.3 8.0 4.731 10.0 — 11.0 — 13.6 — 18.3 16.4 — 5.7 — 5.1

MEAN 7.9 7.2 8.4 9.7 11.5 14.7 16.5 16.3 14.8 12.5 6.9 7.2MAX 10.1 9.4 11.0 10.9 14.9 17.9 19.0 17.5 17.5 15.6 10.1 8.5MIN 5.4 4.4 6.4 7.5 8.9 12.3 13.9 14.7 12.3 5.7 4.4 4.7

BCSR – 14206419 – Bronson Creek at Saltzman Road near Orenco, Oregon [RM 5.1]

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BCBR – 14206423 – BRONSON CREEK AT BRONSON ROAD NEAR ORENCO, OREGON [RM 2.1]Latitude: 45 32 18 Longitude: 122 51 15 Source Agency: District 18 Watermaster



10 4.7 5.6 9.8 10.9 10.5 16.3 17.8 18.1 15.4 12.2 7.3 7.111 5.2 5.3 9.9 11.4 11.4 16.6 18.4 17.6 16.3 11.9 8.9 7.312 6.3 5.3 10.0 11.3 12.2 15.9 18.4 17.0 15.7 12.1 7.3 8.013 7.4 6.7 10.2 11.2 12.7 15.7 18.4 16.8 14.7 12.1 6.6 8.414 7.8 7.7 10.1 10.2 13.2 15.4 17.7 17.3 14.5 12.5 7.8 7.215 6.8 7.7 10.3 10.3 12.0 15.9 18.0 18.2 13.5 11.6 8.6 7.116 6.4 8.0 9.8 10.6 11.0 16.6 18.3 17.1 13.7 12.4 8.9 7.017 5.6 7.5 8.5 10.8 10.6 17.7 17.6 17.5 13.6 14.0 8.6 7.618 5.2 7.7 8.0 10.0 10.7 17.1 17.8 18.1 13.5 13.3 9.9 7.019 4.5 8.2 8.2 10.4 12.0 15.0 18.2 17.9 14.8 14.0 8.9 6.820 5.0 7.9 9.3 11.3 12.9 14.6 18.6 16.6 13.6 14.8 7.4 7.621 5.6 8.8 9.4 10.8 14.1 14.5 19.8 16.8 13.4 15.8 6.8 8.222 6.1 8.2 10.0 10.8 15.7 13.8 20.0 16.9 14.4 15.7 5.4 7.023 7.0 7.0 8.9 10.4 16.6 13.8 19.1 16.0 14.1 13.7 6.2 6.724 7.9 4.2 7.5 10.0 17.2 13.8 18.0 15.6 14.4 11.6 6.5 6.925 9.0 3.6 8.7 9.2 16.2 15.3 17.3 16.0 14.4 11.4 6.4 6.826 10.5 4.2 9.0 9.9 15.4 17.1 17.3 16.8 15.6 11.3 6.7 6.227 9.1 5.6 8.5 10.2 16.0 18.3 17.5 16.7 15.8 11.1 6.4 6.128 8.3 6.1 8.9 11.4 17.7 18.7 18.3 16.0 15.8 12.7 7.4 5.729 8.1 — 9.7 12.2 17.2 19.4 19.0 16.3 15.4 11.7 8.7 5.030 9.1 — 10.8 12.0 16.7 18.7 19.4 17.1 14.9 9.5 8.3 4.031 10.2 — 11.8 — 15.9 — 19.1 16.7 — 6.5 — 4.4

MEAN 7.1 6.6 8.8 10.2 13.2 16.7 17.9 17.1 15.2 13.0 7.0 7.1MAX 10.5 9.2 11.8 12.2 17.7 20.3 20.0 18.3 18.1 15.8 9.9 8.4MIN 4.5 3.6 6.0 7.6 10.1 13.8 15.8 15.6 13.4 6.5 4.8 4.0

BCBR – 14206423 – Bronson Creek at Bronson Road near Orenco, Oregon [RM 2.1]

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BVTS – 14206435 – BEAVERTON CREEK AT 216TH NEAR ORENCO, OREGON [RM 1.2]Latitude: 45 31 15 Longitude: 122 53 59 Source Agency: District 18 Watermaster



10 5.3 6.2 9.8 12.2 11.9 17.9 19.7 19.3 16.4 13.6 7.0 7.211 5.3 6.3 10.3 12.0 12.2 17.4 20.3 19.4 16.8 13.1 7.9 7.212 5.9 6.2 10.2 11.5 13.0 17.3 20.5 19.0 17.0 12.7 8.0 7.613 6.7 6.8 10.3 11.3 13.6 16.8 20.2 18.9 16.4 12.9 7.3 8.014 7.6 7.6 10.2 11.1 14.5 16.5 19.7 19.3 16.2 13.0 7.5 7.415 7.5 7.9 10.5 11.0 13.9 16.9 20.0 20.0 15.5 12.6 8.0 7.016 7.1 8.2 10.3 11.5 12.8 17.8 20.0 19.0 15.1 12.5 8.4 7.117 6.6 7.7 9.8 11.7 12.3 18.9 19.5 19.3 14.9 13.5 8.6 7.418 6.1 7.3 9.3 11.5 11.6 18.9 19.9 19.8 15.1 13.8 9.1 7.319 5.5 8.1 9.0 11.7 12.3 17.1 20.4 20.0 15.7 14.1 9.3 6.820 5.5 8.3 9.2 12.3 13.8 16.0 20.8 19.1 15.4 14.9 7.7 7.021 6.0 8.6 9.8 12.1 14.7 15.6 21.6 19.0 15.2 15.8 7.3 7.822 6.3 9.0 9.9 11.6 16.1 15.1 22.1 19.1 15.4 16.2 6.4 7.823 6.9 8.5 9.7 11.7 17.2 14.9 21.6 18.3 15.6 15.3 6.0 7.124 7.6 6.8 9.0 11.0 18.3 14.8 20.6 17.9 15.8 13.7 6.4 6.925 8.6 5.2 9.4 10.8 17.7 16.0 19.9 18.1 16.0 12.6 6.5 6.826 9.7 5.2 9.3 10.8 16.8 17.6 19.8 18.7 16.4 12.2 6.6 6.527 9.9 6.0 9.3 11.1 16.8 19.3 19.9 18.5 16.8 12.1 6.7 6.328 9.1 6.8 9.7 12.4 18.1 19.9 20.5 18.0 17.1 12.7 6.9 5.929 8.5 — 10.4 12.6 18.5 20.7 21.4 18.3 16.9 12.7 7.9 5.430 8.4 — 11.5 12.3 18.3 20.4 21.9 18.8 16.3 11.4 8.3 4.831 9.5 — 12.4 — 17.1 — 21.9 18.8 — 9.3 — 4.8

MEAN 7.3 7.3 9.3 11.2 14.4 17.9 20.0 19.1 16.8 13.9 7.1 7.2MAX 9.9 9.5 12.4 12.6 18.5 21.1 22.1 21.1 19.7 16.2 9.3 8.5MIN 5.3 5.2 7.1 8.8 11.6 14.8 18.0 17.9 14.9 9.3 5.3 4.8

BVTS – 14206435 – Beaverton Creek at 216th near Orenco, Oregon [RM 1.2]

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DCBR – 14206443 – DAWSON CREEK AT BROOKWOOD ROAD NEAR HILLSBORO, OREGON [RM 0.7]Latitude: 45 31 27 Longitude:122 56 01 Source Agency: District 18 Watermaster



10 5.2 6.4 10.2 12.1 11.9 16.4 19.9 19.4 15.8 11.2 7.2 6.711 5.5 5.9 10.4 12.0 12.8 16.9 20.5 18.8 16.5 11.3 8.4 6.912 5.7 6.0 10.3 11.6 13.3 16.2 20.5 18.3 16.3 11.8 7.3 7.813 6.9 7.1 10.3 11.4 14.2 15.8 19.5 18.5 15.6 12.0 5.9 7.614 7.4 8.1 10.0 11.0 14.3 15.8 19.6 19.2 15.3 12.3 7.1 6.215 7.0 8.0 10.2 11.2 12.9 17.0 20.2 19.2 14.4 11.3 8.0 6.416 6.6 8.0 9.9 11.9 12.2 18.1 20.1 17.8 14.2 12.3 8.3 6.817 5.9 6.9 9.0 11.9 12.1 19.0 19.5 19.3 14.1 13.9 7.9 7.318 5.3 7.2 8.7 11.6 12.2 17.6 20.2 20.2 14.6 13.3 9.3 6.419 4.8 8.1 8.9 12.1 13.2 15.1 20.5 19.6 15.3 14.1 8.0 6.220 5.6 8.1 9.5 12.7 13.9 15.0 20.5 18.2 14.6 15.3 6.4 7.321 6.3 8.9 9.6 11.7 15.5 15.0 22.2 18.8 14.5 16.1 5.9 7.822 6.2 8.7 10.0 11.8 16.9 14.1 22.3 18.5 14.8 15.7 4.4 6.723 6.8 8.0 9.3 11.0 17.8 14.3 20.8 17.4 15.0 13.6 5.2 6.524 7.9 5.3 8.6 10.6 17.7 15.4 19.7 17.7 15.3 11.3 6.0 6.425 9.0 4.7 9.6 10.5 16.6 17.4 19.2 18.4 15.4 10.7 5.7 6.026 10.4 5.3 9.7 11.0 16.4 19.2 19.2 18.4 16.0 10.7 5.9 5.827 9.3 6.8 9.5 11.7 17.7 20.4 20.0 17.8 16.4 10.9 5.6 5.528 8.2 7.0 9.9 12.5 18.5 20.6 21.0 17.5 17.0 12.7 6.7 4.929 7.9 — 10.7 13.2 18.2 21.3 21.8 18.2 16.4 11.3 8.2 4.330 8.6 — 11.8 13.4 16.5 19.8 22.2 18.7 15.8 9.1 7.3 3.931 9.9 — 12.6 — 16.7 — 21.1 18.4 — 5.7 — 4.5

MEAN 7.0 7.0 9.3 11.2 14.4 17.6 19.9 18.7 16.2 12.8 6.3 6.6MAX 10.4 8.9 12.6 13.4 18.5 21.3 22.3 20.2 20.0 16.1 9.3 7.9MIN 4.7 4.7 6.8 8.5 11.7 14.1 17.6 17.4 14.1 5.7 3.9 3.9

DCBR – 14206443 – Dawson Creek at Brookwood Road near Hillsboro, Oregon [RM 0.7]

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RCTV – 14206450 – ROCK CREEK AT HWY 8 NEAR HILLSBORO, OREGON [RM 1.2]Latitude: 45 30 08 Longitude: 122 56 52 Source Agency: District 18 Watermaster


JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 1 18.9 20.9 17.9 16.0 6.3 8.3 2 18.0 20.4 17.8 16.0 5.7 8.5 3 18.0 19.5 18.5 15.9 5.1 8.8 4 18.4 18.9 19.7 15.6 4.8 7.8 5 18.6 19.0 19.9 15.5 4.6 7.8 6 18.5 18.6 19.5 15.1 5.0 8.5 7 19.0 19.6 18.8 15.6 5.3 8.1 8 19.0 18.9 17.2 15.4 6.0 8.0 9 18.9 20.0 16.4 14.2 6.7 7.5

10 19.8 19.7 16.5 13.1 7.0 7.311 17.4 20.6 19.4 17.0 12.7 8.112 17.0 20.7 18.8 16.9 12.5 7.913 16.7 20.3 18.9 16.2 12.6 7.014 16.5 19.7 19.3 15.8 12.9 7.315 16.9 20.1 19.9 15.0 12.2 8.016 17.9 20.1 18.7 14.7 12.6 8.517 19.0 19.7 19.2 14.5 13.9 8.918 18.8 20.0 20.0 14.7 14.0 9.419 16.8 20.6 20.0 15.6 14.4 9.520 15.8 21.1 18.9 15.1 15.6 7.721 15.4 22.0 18.9 14.9 16.5 7.122 14.7 22.4 19.0 15.0 16.7 5.823 14.8 21.6 17.9 15.4 15.1 5.724 15.1 20.4 17.5 15.6 13.3 6.025 16.3 19.7 17.9 15.8 12.2 6.426 18.2 19.6 18.6 16.3 11.7 6.727 19.9 19.8 18.4 16.7 11.7 6.428 20.5 20.7 18.0 16.9 12.8 6.929 — 21.2 21.7 18.3 16.7 12.7 8.630 — 20.4 22.3 18.8 16.3 10.8 8.631 — — — 22.0 18.7 — 8.3 —

MEAN 17.5 20.1 19.1 16.6 13.8 6.9 8.1MAX 21.2 22.4 20.9 19.9 16.7 9.5 8.8MIN 14.7 18.0 17.5 14.5 8.3 4.6 7.3

RCTV – 14206450 – Rock Creek at Hwy 8 near Hillsboro, Oregon [RM 1.2]

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FRMO – 14206500 – TUALATIN RIVER AT FARMINGTON, OREGON [RM 33.3]Latitude: 45 26 58 Longitude: 122 57 02 Source Agency: District 18 Watermaster


JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 1 7.5 10.0 7.6 12.0 13.3 17.7 19.9 21.6 18.2 10.4 2 7.8 9.6 7.6 10.7 13.4 17.6 19.1 20.6 18.0 10.0 3 8.5 9.1 7.8 9.3 13.4 17.7 19.4 19.6 18.0 9.5 4 8.8 8.7 7.4 8.7 12.7 18.4 19.8 18.8 17.7 9.2 5 8.7 8.2 7.6 8.7 12.1 19.0 19.9 18.1 17.7 9.0 6 8.1 7.6 7.9 8.7 12.2 19.7 19.7 18.0 17.4 8.9 7 7.3 7.1 8.6 9.0 12.0 20.5 19.7 18.2 17.3 9.0 8 6.6 6.7 8.3 9.8 11.6 20.7 19.7 18.2 18.3 16.8 9.3 9 5.9 6.4 8.4 10.5 11.3 19.7 19.7 18.9 17.4 16.6 9.7

10 5.6 6.4 9.2 11.3 11.4 18.2 20.4 18.6 16.8 15.2 10.111 5.7 6.7 9.8 11.2 11.8 17.8 21.1 18.0 17.0 14.4 10.712 6.1 6.8 10.0 11.4 12.4 17.5 21.2 17.6 17.4 14.2 10.613 6.9 6.8 10.1 11.7 13.0 17.2 20.9 18.0 17.6 14.2 10.114 7.7 7.4 10.0 11.5 13.7 17.0 20.1 18.6 17.5 14.0 10.215 7.9 8.0 10.1 10.8 13.8 16.9 20.2 19.0 17.1 13.9 10.416 7.3 8.4 10.1 10.9 13.2 17.6 20.4 18.5 16.8 14.1 10.617 6.9 8.3 9.9 11.5 12.3 18.4 20.4 18.8 16.3 14.7 10.318 6.5 7.9 9.5 11.4 11.7 18.8 20.9 18.9 16.3 15.1 9.919 6.1 7.8 9.1 11.0 12.2 17.9 21.1 19.1 16.9 15.620 6.0 8.1 9.3 11.2 12.8 17.0 21.3 19.1 16.9 16.021 6.4 8.4 9.5 11.7 13.8 16.4 21.7 19.3 17.1 16.822 6.9 8.8 9.8 11.4 15.0 15.8 22.0 19.0 17.3 17.223 7.4 8.7 9.9 11.2 16.0 15.4 21.9 17.6 16.624 7.9 7.7 9.5 11.1 17.0 15.5 21.6 17.9 15.425 8.6 6.0 9.5 10.3 16.8 16.6 21.0 18.1 14.426 9.4 5.5 9.6 10.4 16.6 18.2 20.8 18.4 14.127 9.9 5.9 9.8 10.7 16.4 19.9 20.8 18.6 14.128 9.1 6.8 10.0 11.4 17.1 20.8 20.9 18.8 14.729 8.2 — 10.3 12.2 17.7 21.4 21.1 18.7 14.530 8.4 — 11.1 12.8 17.9 21.0 21.8 18.5 13.631 9.5 — 11.9 — 17.6 — 22.1 — 11.9 —

MEAN 7.5 7.6 9.3 10.8 13.9 18.2 20.7 18.8 17.5 15.6 9.9MAX 9.9 10.0 11.9 12.8 17.9 21.4 22.1 21.6 18.8 18.2 10.7MIN 5.6 5.5 7.4 8.7 11.3 15.4 19.1 17.6 16.3 11.9 8.9

FRMO – 14206500 – Tualatin River at Farmington, Oregon [RM 33.3]

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BCHH – BURRIS CREEK AT HWY 219 [RM 0.38]Latitude: 45 25 34 Longitude: 122 57 40 Source Agency: District 18 Watermaster



10 6.4 6.4 10.3 10.8 11.2 15.3 17.5 17.4 15.2 12.6 7.011 6.4 5.8 10.3 11.1 11.5 15.2 17.9 16.9 15.9 11.9 8.012 7.0 5.6 10.4 11.2 12.0 15.1 18.2 16.3 15.7 11.9 7.613 8.0 6.7 10.5 11.3 12.0 15.2 18.1 16.1 14.7 12.1 6.614 8.5 8.0 10.3 10.5 12.4 14.8 17.7 16.2 14.1 12.1 6.915 7.9 8.1 10.4 10.5 11.8 15.2 17.7 16.6 13.5 12.2 7.916 7.5 8.3 10.0 10.8 10.9 15.5 17.8 16.3 13.3 12.1 8.317 7.0 7.8 9.2 11.0 10.4 16.2 17.5 16.5 13.0 13.2 8.418 6.5 8.1 9.0 10.1 9.9 16.0 17.5 17.6 13.0 13.0 9.419 5.9 8.9 9.1 10.2 10.9 14.7 17.5 17.9 13.4 13.2 9.420 6.3 8.9 9.6 11.0 11.6 14.3 17.9 17.3 13.3 14.2 8.021 6.8 9.6 10.0 10.9 12.5 14.1 18.6 17.1 13.0 15.0 7.222 7.1 9.0 10.2 10.7 13.6 13.3 18.9 16.7 12.9 14.9 5.923 7.7 8.1 9.5 10.5 14.3 13.4 18.8 16.4 13.2 13.9 5.824 8.5 6.2 8.7 10.3 14.8 13.6 18.1 16.0 13.4 11.9 6.125 9.5 5.3 9.5 9.9 14.5 14.4 17.6 15.8 13.4 11.0 6.326 10.7 5.6 9.8 10.1 13.9 15.9 17.3 15.8 13.7 10.8 6.627 9.8 6.7 9.4 10.1 14.1 17.3 17.2 15.8 14.1 10.6 6.628 8.8 7.0 9.7 10.8 15.1 17.6 17.4 15.7 14.2 11.4 7.129 8.7 — 10.0 11.2 15.2 18.2 17.9 15.7 14.1 11.5 8.330 9.4 — 10.8 11.6 15.1 18.2 18.5 15.8 14.1 10.1 8.631 10.5 — 11.5 — 14.6 — 18.7 15.8 — 8.0 —

MEAN 8.0 7.4 9.4 10.3 12.3 15.5 17.8 16.7 14.4 12.7 7.0 8.3MAX 10.7 9.7 11.5 11.6 15.2 18.2 18.9 18.1 16.4 15.0 9.4 8.4MIN 5.9 5.3 6.9 8.5 9.9 13.3 17.2 15.7 12.9 8.0 5.2 8.3

BCHH – Burris Creek at Hwy 219 [RM 0.38]

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MCMR – MCFEE CREEK AT MIDWAY ROAD [RM 2.04]Latitude: 45 24 19 Longitude: 122 57 37 Source Agency: District 18 Watermaster



10 6.0 6.4 9.3 10.0 10.3 15.4 18.1 18.3 15.8 12.1 7.011 6.1 5.8 9.5 10.2 10.5 15.7 19.1 17.8 16.5 11.9 8.012 6.9 5.7 9.6 10.4 11.0 15.2 19.1 17.3 16.2 11.8 7.613 7.9 6.8 9.7 10.4 11.2 14.9 18.8 17.3 15.0 11.8 6.714 8.3 8.1 9.6 9.8 11.7 14.7 18.2 17.9 14.8 11.9 7.415 7.6 8.0 9.7 9.7 11.3 15.2 18.2 18.5 13.8 11.2 8.016 7.2 8.1 9.5 10.0 10.6 16.1 18.6 17.4 13.6 11.9 8.217 6.7 7.6 9.0 10.2 10.1 17.2 18.0 17.9 13.1 13.5 8.018 6.2 8.2 8.7 9.6 9.5 16.7 18.3 18.8 13.3 13.4 9.119 5.7 8.6 8.8 9.5 10.2 14.6 18.9 18.6 14.2 13.6 9.220 6.2 8.5 8.9 10.1 11.0 13.9 19.3 17.2 13.7 14.6 7.121 6.7 9.0 9.3 10.3 11.8 14.0 20.3 17.3 13.6 15.7 6.222 7.0 8.5 9.5 10.0 13.1 13.2 20.9 17.3 13.9 16.0 4.923 7.6 7.9 9.0 10.2 13.9 13.2 20.1 16.5 14.2 14.1 5.224 8.3 6.4 8.4 9.8 14.7 13.7 19.0 16.0 14.5 11.8 5.625 9.3 5.6 9.0 9.4 14.1 15.0 18.3 16.4 14.7 10.8 5.726 10.3 5.7 9.2 9.4 13.6 16.9 18.3 17.1 15.5 10.7 6.127 9.2 6.6 9.0 9.5 13.8 18.5 18.4 17.1 16.0 10.8 5.828 8.3 6.8 9.1 10.0 15.2 18.7 19.2 16.7 15.7 11.9 6.329 8.4 — 9.3 10.3 15.1 19.2 20.2 17.0 15.5 11.7 7.830 9.2 — 10.0 10.6 15.0 18.7 20.7 17.6 15.1 10.2 8.131 10.0 — 10.7 — 14.2 — 20.3 17.2 — 7.7 —

MEAN 7.7 7.2 8.9 9.7 11.8 15.8 18.5 17.7 15.4 12.9 6.6 7.8MAX 10.3 9.2 10.7 10.6 15.2 19.2 20.9 19.1 18.6 16.0 9.2 7.9MIN 5.6 5.6 7.0 8.2 9.5 13.2 16.1 16.0 13.1 7.7 4.9 7.8

MCMR – McFee Creek at Midway Road [RM 2.04]

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ELSN – 14206600 – TUALATIN RIVER AT ELSNER ROAD NEAR SHERWOOD, OREGON [RM 16.2]Latitude: 45 23 17 Longitude: 122 51 03 Source Agency: District 18 Watermaster



10 5.6 6.3 8.8 10.8 11.7 20.5 21.9 20.1 19.0 16.1 8.111 5.5 6.3 9.6 11.5 11.8 20.3 22.3 19.8 18.2 15.4 8.512 5.7 6.5 9.9 11.4 12.2 19.7 22.4 19.9 17.5 14.9 8.513 6.3 6.7 10.0 11.6 12.8 18.9 22.2 20.0 17.2 14.0 8.514 7.1 7.0 10.1 11.6 13.4 18.5 22.1 20.1 17.1 13.9 8.815 7.6 7.4 10.1 11.4 13.6 18.5 22.3 20.1 17.0 13.6 9.216 7.6 7.9 10.1 10.8 13.5 18.7 22.5 19.7 16.8 13.6 9.217 7.0 8.2 10.0 11.1 13.3 19.2 22.5 19.9 16.8 13.9 9.418 6.6 8.0 9.7 11.4 12.9 19.3 22.6 20.4 16.7 14.0 9.819 6.2 7.8 9.2 11.4 12.7 18.6 22.7 20.7 16.7 14.3 10.020 5.9 7.9 9.1 11.2 12.9 18.4 22.9 20.5 16.5 14.7 9.221 5.9 8.2 9.4 11.4 13.5 18.2 23.3 20.5 16.5 15.3 8.622 6.3 8.4 9.7 11.7 14.3 17.7 23.6 20.5 16.4 15.9 7.723 6.8 8.7 9.8 11.5 15.4 17.3 23.7 20.2 16.6 15.8 7.324 7.5 8.1 9.7 11.1 16.5 17.0 23.6 19.8 16.7 15.4 6.825 8.1 7.0 9.5 11.0 16.8 17.1 23.4 19.9 17.0 15.0 6.626 8.9 5.8 9.5 10.4 17.1 17.9 23.3 20.0 17.4 14.6 6.527 9.6 5.6 9.7 10.6 17.3 18.7 23.3 19.8 17.7 14.3 6.628 9.7 6.0 9.9 11.1 17.7 19.5 23.4 19.6 17.9 14.1 6.529 8.7 — 10.2 11.7 17.9 20.4 23.5 19.5 17.9 13.6 6.830 8.2 — 10.8 12.4 18.1 20.9 23.8 19.6 18.0 12.9 7.331 9.0 — 11.6 — 17.9 — 23.9 19.5 — 11.9 —

MEAN 7.4 7.6 9.2 10.9 14.1 19.0 22.5 20.6 18.0 15.3 8.3 8.2MAX 9.7 9.9 11.6 12.4 18.1 21.0 23.9 23.7 20.3 17.9 11.0 8.3MIN 5.5 5.6 6.8 8.6 11.7 17.0 21.0 19.5 16.4 11.9 6.5 8.1

ELSN – 14206600 – Tualatin River at Elsner Road near Sherwood, Oregon [RM 16.2]

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CCER – 14206748 – CEDAR CREEK AT EDY ROAD NEAR SHERWOOD, OREGON [RM 0.62]Latitude: 45 22 05 Longitude: 122 51 22 Source Agency: District 18 Watermaster



10 6.1 6.6 9.8 11.2 11.7 16.7 17.5 18.0 15.7 13.1 7.9 7.611 6.2 6.2 10.0 11.5 12.1 16.5 18.2 17.7 16.0 12.6 8.6 7.912 6.8 5.8 10.3 11.7 12.7 16.2 18.4 17.3 15.8 12.7 8.1 8.313 7.7 6.7 10.3 11.4 13.1 15.9 18.4 17.1 15.2 12.5 7.3 8.714 8.2 8.1 10.1 10.5 13.7 15.9 17.7 17.2 14.8 12.5 7.8 7.615 7.2 8.3 10.4 10.7 13.0 16.0 18.0 17.7 14.3 12.0 8.5 7.816 6.9 8.4 10.0 11.3 11.8 16.6 18.2 17.2 14.1 12.3 8.8 7.617 6.7 7.6 9.3 11.4 10.8 17.3 17.7 17.2 13.7 13.2 8.7 8.418 6.2 8.1 9.2 10.4 10.5 17.3 17.6 17.6 13.5 13.3 9.7 7.419 5.5 8.7 9.0 10.7 11.8 16.0 18.0 17.7 14.2 13.8 8.5 6.920 5.6 8.6 9.6 11.6 12.7 15.3 18.2 17.0 13.8 14.5 7.0 7.821 6.3 9.3 9.9 11.2 13.7 15.2 19.0 16.8 13.5 15.2 6.4 8.722 6.6 8.9 10.2 11.1 15.3 14.5 19.4 16.7 13.8 15.4 5.7 7.823 7.5 8.0 9.2 11.2 16.2 14.5 19.0 16.3 13.9 14.1 6.0 7.024 8.3 6.1 8.5 10.4 16.9 14.6 18.3 15.8 14.0 12.4 6.4 7.125 9.6 5.3 9.6 10.1 16.2 15.4 17.8 15.8 14.1 11.7 6.3 7.226 11.2 5.8 9.8 10.1 15.6 16.7 17.6 16.3 14.5 11.5 6.5 7.027 9.6 7.2 9.6 10.5 15.9 18.0 17.6 16.5 14.7 11.3 6.4 6.128 8.7 7.1 9.9 11.5 17.0 18.2 17.9 16.1 14.8 12.2 6.9 6.629 8.6 — 10.3 11.8 17.2 18.8 18.3 16.2 15.0 12.0 8.6 5.130 9.6 — 11.3 12.2 16.9 18.7 18.7 16.4 14.7 10.6 8.8 5.231 10.8 — 11.9 — 15.9 — 18.8 16.3 — 8.4 — 5.7

MEAN 7.8 7.4 9.4 10.7 13.5 16.7 17.9 17.1 15.1 13.1 7.2 7.5MAX 11.2 9.5 11.9 12.2 17.2 19.1 19.4 18.2 17.1 15.4 9.7 8.7MIN 5.5 5.3 7.1 8.3 10.5 14.5 16.8 15.8 13.5 8.4 5.5 5.1

CCER – 14206748 – Cedar Creek at Edy Road near Sherwood, Oregon [RM 0.62]

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CCSR – 14206750 – CHICKEN CREEK AT SCHOLLS-SHERWOOD ROAD [RM 2.3] Latitude: 45 22 31 Longitude: 122 51 24 Source Agency: District 18 Watermaster



10 5.5 6.0 9.3 10.6 11.0 16.2 18.0 18.1 15.4 12.3 6.7 6.911 5.6 5.7 9.5 10.9 11.4 16.1 18.7 17.5 15.9 11.7 7.6 7.212 6.2 5.3 9.7 11.2 12.1 15.6 18.8 17.3 15.3 12.0 6.6 7.713 7.1 6.3 9.7 10.9 12.4 15.4 18.6 17.3 14.7 11.7 6.0 8.214 7.6 7.6 9.6 10.0 12.9 15.3 18.0 17.6 14.4 11.6 6.8 7.315 6.7 7.7 9.9 10.2 12.2 15.7 18.5 18.0 13.4 10.9 7.4 7.316 6.3 7.9 9.4 10.6 10.9 16.4 18.6 17.2 13.5 11.7 7.9 7.117 6.1 7.2 8.7 10.7 10.0 17.2 18.1 17.8 13.0 12.9 7.8 7.818 5.6 7.7 8.6 9.8 9.7 16.9 18.1 18.2 13.1 12.3 8.9 6.819 4.8 8.2 8.4 10.0 11.1 15.3 18.5 18.0 14.0 13.2 8.5 6.320 5.0 8.2 9.1 10.9 12.0 14.7 18.9 16.9 13.2 14.1 6.7 7.221 5.7 8.9 9.4 10.6 13.2 14.4 20.1 17.0 13.3 14.8 5.8 8.122 6.0 8.4 9.7 10.5 14.7 13.7 20.4 16.6 13.8 14.7 4.9 7.223 6.7 7.4 8.7 10.3 15.7 13.7 19.5 16.0 13.7 13.0 5.1 6.324 7.6 5.5 8.0 9.9 16.2 14.2 18.6 15.8 13.9 11.4 5.4 6.725 8.9 4.8 9.0 9.4 15.5 15.3 18.0 16.1 13.9 11.1 5.6 6.826 10.3 5.2 9.3 9.5 14.8 16.8 18.2 16.6 14.6 10.9 5.9 6.427 9.1 6.6 9.0 9.9 15.3 18.1 18.3 16.6 14.9 10.5 5.6 6.028 8.2 6.5 9.3 10.8 16.5 18.5 18.7 16.2 14.7 11.6 6.1 6.429 8.0 — 9.7 11.3 16.7 19.1 19.3 16.5 14.7 10.8 7.7 5.130 8.9 — 10.7 11.6 16.1 18.6 19.8 16.8 14.3 9.4 8.0 4.831 10.0 — 11.4 — 15.4 — 19.4 16.5 — 6.9 — 5.3

MEAN 7.1 6.9 8.8 10.0 12.8 16.4 18.4 17.2 14.9 12.4 6.2 7.0MAX 10.3 9.0 11.4 11.6 16.7 19.1 20.4 18.5 17.3 14.8 8.9 8.2MIN 4.8 4.8 6.5 7.7 9.7 13.7 16.6 15.8 13.0 6.9 4.2 4.8

CCSR – 14206750 – Chicken Creek at Scholls-Sherwood Road near Sherwood, Oregon [RM 2.3]

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SCRL – 14206905 – SYLVAN CREEK AT RALEIGHWOOD LANE NEAR WEST SLOPE, OREGON [RM 1.0]Latitude: 45 29 35 Longitude: 122 44 48 Source Agency: District 18 Watermaster



10 6.5 7.4 9.7 10.4 10.3 14.6 16.7 17.4 15.2 12.4 8.3 7.311 6.4 6.7 9.8 10.9 11.1 15.2 17.5 16.9 16.0 11.8 9.4 7.612 7.0 7.0 10.1 10.7 11.6 14.4 17.6 16.3 15.3 12.2 7.9 8.513 8.0 8.2 10.2 10.3 12.1 14.5 17.5 16.2 14.1 12.3 7.8 8.514 8.4 9.0 10.0 9.6 11.9 14.4 16.5 16.7 14.4 12.5 8.9 7.715 7.7 8.6 10.1 10.2 10.8 14.9 17.4 17.9 13.5 11.6 9.1 8.016 7.4 8.2 9.5 10.4 9.5 15.6 17.6 16.7 13.6 12.5 9.0 8.017 7.0 7.7 8.7 9.5 8.6 17.0 16.5 17.3 13.3 14.2 8.9 8.518 6.7 8.4 8.6 9.4 9.2 15.6 16.7 17.9 13.4 13.8 10.4 7.719 6.4 8.7 8.8 10.1 10.9 13.5 17.3 17.6 14.7 14.1 8.2 7.320 6.6 8.4 9.5 10.8 11.7 13.6 17.6 15.5 13.7 15.0 7.1 8.121 6.9 9.4 9.2 10.2 13.2 13.2 19.0 16.4 13.8 16.1 6.7 8.822 6.9 8.6 9.4 10.3 14.2 12.7 18.9 16.9 14.5 15.9 5.4 7.623 7.8 7.3 8.5 9.9 15.3 12.8 18.0 15.2 14.6 12.8 6.6 7.224 8.6 4.6 7.8 9.4 15.1 13.8 17.0 15.1 15.1 11.5 7.1 7.525 9.5 5.0 9.2 9.1 14.0 14.8 16.5 15.5 15.2 11.5 7.0 7.326 10.3 5.8 8.8 9.4 13.5 16.6 16.8 16.9 15.9 11.8 7.4 6.827 9.4 7.2 8.7 10.0 14.8 17.4 16.9 16.5 16.3 12.3 7.1 6.528 9.0 7.0 9.2 10.9 16.0 17.6 17.8 15.3 16.8 13.8 8.0 6.729 8.6 — 10.2 11.4 15.5 18.4 18.7 15.9 16.0 11.3 9.3 5.830 9.3 — 11.3 10.9 14.5 17.1 19.2 16.7 15.4 8.3 8.6 5.731 10.0 — 11.3 — 14.5 — 18.8 16.3 — 5.6 — 5.8

MEAN 8.1 7.6 8.9 9.7 12.0 15.4 17.0 16.7 15.3 13.1 7.3 7.6MAX 10.3 9.6 11.3 11.4 16.0 18.6 19.2 17.9 17.8 16.1 10.4 8.8MIN 6.4 4.6 6.6 7.5 8.6 12.7 14.6 15.1 13.3 5.6 4.8 5.7

SCRL – 14206905 – Sylvan Creek at Raleighwood Lane near West Slope, Oregon [RM 1.0]

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ASMP – 14206933 – ASH CREEK AT METZGER PARK AT METZGER, OREGON [RM 1.25]Latitude: 45 27 00 Longitude: 122 45 45 Source Agency: District 18 Watermaster



10 5.8 7.2 10.0 11.0 11.1 14.6 17.2 17.4 15.7 12.5 8.7 7.411 6.0 6.3 10.2 11.6 11.7 15.0 17.8 16.9 16.5 11.8 9.7 7.912 7.3 6.5 10.5 11.5 12.2 14.5 17.9 16.5 15.5 12.8 8.3 8.813 8.2 8.0 10.5 11.4 12.2 14.7 17.7 16.3 14.3 12.4 7.7 8.714 8.4 8.9 10.3 10.8 12.2 14.8 16.9 16.9 14.3 12.5 8.7 7.915 7.6 8.6 10.4 11.0 11.0 15.0 17.4 17.7 13.4 11.5 9.3 8.116 7.3 8.7 9.9 11.3 9.9 15.5 17.5 16.7 13.8 12.9 9.3 8.017 6.8 8.0 9.2 11.1 9.0 16.5 16.7 17.2 13.3 14.5 9.2 8.418 6.3 8.8 9.0 10.7 10.0 15.7 17.0 17.8 13.4 13.7 10.6 7.419 5.7 9.1 9.1 10.9 11.3 13.8 17.6 17.4 14.7 14.4 8.6 7.020 6.2 8.8 10.0 11.6 12.0 13.7 18.1 15.8 13.7 15.4 7.7 8.221 6.7 9.6 9.7 10.9 13.2 13.7 19.2 16.4 13.5 16.5 7.1 9.122 7.0 8.9 10.0 11.1 14.1 12.9 19.3 16.5 14.2 16.3 5.4 7.723 7.9 7.7 9.3 10.8 15.1 13.1 18.2 15.4 14.4 13.4 6.2 7.224 8.9 5.5 8.6 10.7 15.3 13.7 17.0 15.1 14.7 11.1 6.9 7.625 9.9 5.3 9.7 10.2 14.3 14.6 16.6 15.8 15.1 11.0 6.8 7.726 10.9 6.1 9.4 10.4 13.7 16.3 16.9 16.5 15.9 11.6 7.3 7.127 9.6 7.4 9.4 10.9 14.7 17.5 17.0 16.3 16.3 11.7 6.8 6.428 9.1 7.3 9.8 11.7 15.4 17.6 17.9 15.6 16.8 13.3 7.7 7.129 8.8 — 10.5 11.9 15.4 18.3 18.7 16.2 16.0 11.6 9.6 5.830 9.9 — 11.5 12.1 14.8 17.3 19.2 16.9 15.0 8.8 8.9 5.931 10.7 — 11.7 — 14.5 — 18.9 16.5 — 6.0 — 5.8

MEAN 8.0 7.7 9.4 10.7 12.4 15.4 17.2 16.7 15.4 13.1 7.4 7.8MAX 10.9 9.9 11.7 12.1 15.4 18.3 19.3 18.0 18.1 16.5 10.6 9.1MIN 5.7 5.3 6.9 8.2 9.0 12.9 14.7 15.1 13.3 6.0 4.8 5.8

ASMP – 14206933 – Ash Creek at Metzger Park at Metzger, Oregon [RM 1.25]

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SLAB – SUMMER CREEK ABOVE SUMMER LAKE NEAR TIGARD, OREGON [RM 1.52]Latitude: 45 26 20 Longitude: 122 48 38 Source Agency: District 18 Watermaster


JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 1 8.8 10.2 8.6 11.9 13.8 18.1 20.2 22.9 19.3 17.0 4.8 2 9.5 9.7 7.5 9.5 14.8 17.9 19.6 21.8 19.5 16.8 5.2 3 9.8 9.2 7.8 8.9 13.6 17.3 20.2 20.8 20.4 16.9 4.8 4 10.2 8.0 7.4 9.5 12.7 19.1 20.9 20.7 21.6 16.6 4.9 5 8.7 6.9 8.7 8.9 13.5 20.9 21.1 20.6 21.6 16.6 4.9 6 7.9 6.5 8.7 9.8 13.8 22.4 21.4 20.4 21.0 16.1 4.7 7 7.0 6.0 8.8 10.9 12.7 23.3 21.8 21.7 20.0 16.4 8 5.9 5.9 8.9 12.5 11.9 21.8 21.6 20.1 18.4 15.6 9 5.5 5.7 10.0 13.2 12.7 18.8 21.8 20.7 17.0 13.9

10 5.5 7.0 10.9 12.9 12.8 17.5 22.7 21.1 17.2 13.311 5.8 6.2 11.1 13.1 13.7 18.3 23.2 20.6 18.1 12.812 7.0 6.3 11.1 12.8 14.8 17.7 23.1 20.4 17.8 13.013 8.1 7.8 11.1 12.2 15.8 17.4 22.2 20.7 17.2 13.114 8.7 9.0 10.9 11.3 16.5 17.5 21.7 21.3 17.1 13.415 7.7 8.9 11.3 12.0 14.5 18.5 22.3 21.6 16.2 12.516 7.4 8.8 10.5 12.5 12.5 19.6 22.1 20.4 16.1 13.317 6.8 8.1 9.6 12.8 12.3 20.7 21.8 21.2 15.7 14.918 6.2 8.5 9.3 12.5 13.4 19.1 22.5 22.0 16.1 14.619 5.4 9.2 9.2 13.1 15.2 16.5 23.2 21.6 17.0 15.220 6.0 8.8 10.6 13.7 16.1 16.3 23.6 20.4 16.3 16.421 6.6 9.8 10.5 12.3 17.7 16.5 24.6 20.7 16.1 17.522 6.9 9.4 10.7 12.6 19.0 15.6 24.6 20.4 16.5 17.423 7.6 8.3 9.9 12.2 20.0 15.4 23.5 19.3 16.8 15.124 8.8 5.2 9.3 11.8 19.5 16.3 22.3 19.3 17.2 12.925 10.1 4.8 10.4 11.2 17.7 18.8 21.8 19.9 17.4 12.126 11.5 5.7 10.6 11.7 17.4 21.2 21.9 20.2 18.0 12.127 10.1 7.3 10.0 12.7 19.0 22.7 22.1 19.7 18.1 12.028 9.2 7.5 10.6 13.7 20.0 22.9 23.1 19.5 18.4 13.429 9.0 — 11.9 13.3 19.8 23.5 24.0 19.9 17.9 12.530 10.0 — 13.3 12.4 18.4 22.0 24.6 20.5 17.3 10.131 11.1 — 13.8 — 17.9 — 24.0 20.1 — 6.7 —

MEAN 8.0 7.7 10.1 11.9 15.6 19.1 22.4 20.7 17.9 14.2 4.9MAX 11.5 10.2 13.8 13.7 20.0 23.5 24.6 22.9 21.6 17.5 5.2MIN 5.4 4.8 7.4 8.9 11.9 15.4 19.6 19.3 15.7 6.7 4.7

SLAB – Summer Creek above Summer Lake near Tigard, Oregon [RM 1.52]

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SC121 – 14206938 – SUMMER CREEK AT 121ST AVENUE NEAR TIGARD, OREGON [RM 1.0]Latitude: 45 26 06 Longitude: 122 47 55 Source Agency: District 18 Watermaster


JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 1 7.8 9.7 7.8 12.5 14.2 20.8 21.5 24.7 22.5 18.5 8.4 8.6 2 8.5 9.3 7.4 15.7 20.2 22.1 23.3 22.3 18.3 7.9 8.6 3 9.2 8.8 7.5 14.3 20.5 23.2 22.9 22.6 18.3 7.5 8.9 4 9.5 7.9 7.1 13.4 21.2 23.9 23.5 23.6 18.1 7.5 7.8 5 8.3 6.9 7.8 14.2 22.4 23.2 22.6 24.2 17.8 7.1 8.1 6 7.1 6.4 8.0 14.4 23.8 24.1 22.8 23.8 17.3 7.0 8.8 7 6.1 6.1 8.0 13.7 24.8 24.5 23.9 22.7 17.4 7.1 8.1 8 5.2 5.9 8.2 13.1 24.0 22.9 22.7 20.9 16.9 7.4 8.2 9 4.4 5.7 8.9 13.2 21.5 24.8 22.2 19.1 15.7 7.8 7.7

10 4.6 6.6 10.0 13.1 20.8 26.0 22.4 17.8 14.9 8.3 7.411 4.3 6.2 10.3 13.8 21.1 26.3 22.7 19.0 14.1 9.2 7.512 5.6 6.4 10.4 14.8 20.2 25.2 22.9 19.2 13.5 9.4 8.113 6.8 7.1 10.5 16.7 19.5 23.8 23.1 19.3 13.8 9.0 8.514 7.7 8.0 10.3 17.2 20.1 24.2 23.7 19.4 14.2 9.0 7.715 7.2 8.0 10.7 15.5 21.3 24.7 23.8 17.7 13.3 9.3 7.416 6.6 8.2 10.5 13.0 14.1 22.5 23.6 22.5 17.8 13.5 9.2 7.317 5.9 7.5 10.0 13.1 13.3 23.7 24.0 23.5 17.3 14.9 8.8 7.718 5.3 7.7 9.4 13.5 14.1 21.2 25.3 24.4 17.5 15.1 9.5 7.219 4.7 8.2 9.0 14.0 15.8 19.0 25.9 24.1 18.6 15.5 9.4 6.720 5.1 8.2 9.6 14.2 16.5 18.9 26.2 22.8 18.4 16.2 7.7 7.121 5.4 8.7 10.0 12.7 18.4 18.9 27.1 23.0 18.6 17.7 7.3 8.122 5.5 8.9 10.1 12.8 19.9 17.8 26.2 22.7 19.1 18.0 6.2 7.623 6.6 8.6 9.6 12.1 21.6 17.3 25.1 21.7 19.4 16.6 6.6 6.924 7.6 6.3 9.3 12.1 21.3 19.9 24.1 22.2 19.4 15.1 6.8 7.125 8.8 5.4 9.7 11.7 19.8 21.8 24.2 22.7 19.9 14.4 6.7 7.326 10.5 5.5 10.2 11.7 19.4 24.1 24.7 22.7 20.7 14.4 6.9 6.927 10.1 6.5 10.1 13.4 20.8 25.5 24.9 22.0 20.3 14.3 6.8 6.428 9.1 6.5 10.4 13.9 21.8 25.1 25.8 21.9 20.2 15.1 7.2 6.229 8.4 — 11.5 15.0 21.7 25.4 26.6 22.5 19.9 14.4 8.3 5.830 9.2 — 12.7 12.1 20.2 23.2 26.8 23.2 19.0 12.6 8.8 5.131 10.5 — 13.4 — 20.4 — 25.7 23.1 — 10.2 — 4.9

MEAN 7.1 7.3 9.6 13.0 16.7 21.6 24.7 23.0 20.0 15.5 7.9 7.4MAX 10.5 9.7 13.4 15.0 21.8 25.5 27.1 24.7 24.2 18.5 9.5 8.9MIN 4.3 5.4 7.1 11.7 13.1 17.3 21.5 21.7 17.3 10.2 6.2 4.9

SC121 – 14206938 – Summer Creek at 121st Avenue near Tigard, Oregon [RM 1.0]

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FANO – 14206950 – FANNO CREEK AT DURHAM ROAD NEAR TIGARD, OREGON [RM 1.2]Latitude: 45 24 12 Longitude: 122 45 18 Source Agency: District 18 Watermaster



10 4.4 5.4 9.1 11.2 10.7 15.1 17.6 18.1 14.9 12.7 7.2 6.611 4.5 5.2 9.5 11.3 11.2 14.6 17.7 18.0 15.2 12.1 7.9 6.612 5.4 5.1 9.7 10.8 12.0 14.7 18.1 17.6 15.3 11.9 7.9 7.113 6.4 6.1 9.8 10.8 12.4 14.3 17.8 17.5 15.0 12.0 7.7 7.714 7.2 7.2 9.4 10.5 12.9 14.1 17.8 18.2 14.7 12.0 7.9 6.215 6.5 7.5 9.8 10.2 12.4 14.2 17.8 18.4 14.2 11.7 8.3 6.216 6.1 7.6 9.4 10.9 11.0 15.1 17.4 17.8 14.0 11.7 8.4 6.117 5.6 6.8 8.5 10.8 10.3 15.9 17.2 17.9 13.8 12.2 8.4 6.618 5.1 6.9 8.2 10.6 9.5 16.0 17.8 17.9 13.6 12.6 8.8 6.219 4.4 7.7 8.1 10.9 11.2 15.0 18.5 17.4 13.9 12.8 8.6 5.620 4.5 7.6 8.6 11.5 12.3 14.3 18.9 17.1 13.8 13.1 6.9 6.421 5.1 8.1 9.1 10.9 13.2 14.2 19.6 17.4 13.6 13.7 6.6 7.422 5.4 8.1 9.2 10.4 14.4 13.8 20.0 17.0 13.6 14.1 5.8 6.723 6.1 7.3 8.6 10.7 14.9 13.5 19.5 16.4 13.9 13.5 5.6 5.924 7.1 4.8 7.8 10.2 15.3 13.5 18.9 16.3 14.2 12.5 6.0 6.025 8.3 3.8 8.7 10.0 14.8 14.1 18.4 16.5 14.3 11.9 6.0 5.826 9.9 4.3 8.7 9.8 13.5 14.9 18.2 16.6 14.5 11.6 6.2 5.527 9.1 5.4 8.5 10.2 14.1 16.0 18.2 16.4 14.7 11.4 6.1 4.728 8.3 6.0 9.0 11.6 14.9 17.0 18.8 16.3 14.9 11.8 6.4 5.029 7.7 — 9.8 11.9 15.1 17.2 19.3 16.4 14.7 11.8 7.6 3.930 8.4 — 11.1 11.4 14.8 17.1 19.5 17.0 14.5 10.9 8.0 3.531 9.8 — 11.8 — 14.4 — 19.0 17.2 — 9.5 — 3.6

MEAN 6.7 6.4 8.6 10.2 12.5 15.3 17.7 17.4 15.1 12.7 7.1 6.3MAX 9.9 8.9 11.8 11.9 15.3 17.2 20.0 19.1 17.5 14.2 8.8 8.0MIN 4.4 3.8 6.2 7.2 9.5 13.5 15.4 16.3 13.6 9.5 5.6 3.5

FANO – 14206950 – Fanno Creek at Durham Road near Tigard, Oregon [RM 1.2]

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HCTP – 14206958 – HEDGES CREEK AT TUALATIN COMMUNITY PARK AT TUALATIN, OREGON [RM 0.3]Latitude: 45 23 08 Longitude: 122 45 37 Source Agency: District 18 Watermaster



10 4.4 7.0 10.6 14.4 13.9 18.4 18.4 18.8 16.8 14.1 7.5 6.511 4.7 6.5 11.1 14.1 14.7 18.3 18.8 18.7 17.3 13.6 8.5 6.912 5.6 6.5 11.1 13.8 15.8 18.2 19.0 18.3 17.0 13.3 8.0 7.613 6.7 7.7 11.1 13.5 16.4 17.7 18.9 17.9 16.3 13.1 7.3 8.014 7.4 8.7 10.8 12.6 17.3 17.5 18.4 17.7 15.8 13.3 7.7 6.715 6.9 8.8 11.3 13.1 15.5 17.9 18.5 18.2 15.2 12.4 8.4 6.116 6.3 8.8 11.0 13.9 13.5 18.6 18.6 17.6 15.1 12.9 8.6 6.017 5.8 7.9 10.7 14.1 12.6 19.5 18.0 17.7 14.9 14.1 8.5 6.718 5.4 8.0 10.3 13.2 12.9 19.1 17.8 18.1 14.9 13.8 9.8 6.119 4.7 8.5 9.6 14.1 15.1 17.4 17.9 18.2 15.2 14.6 9.0 5.820 5.2 8.3 10.4 15.2 16.3 16.8 18.0 17.5 14.9 16.1 6.6 6.621 5.7 9.2 10.9 13.8 17.6 16.5 18.5 17.4 14.6 17.0 6.0 7.822 6.0 9.3 10.8 13.1 19.4 16.0 18.9 17.6 14.6 16.9 4.6 6.723 7.0 8.3 10.0 13.3 20.5 15.8 18.6 17.1 14.6 15.1 5.1 6.224 8.1 4.7 9.6 12.4 20.4 15.9 18.2 16.7 14.8 13.1 5.8 6.425 9.3 4.3 10.3 12.4 18.9 16.8 17.8 16.8 14.9 12.4 6.0 6.326 11.2 5.6 10.6 12.0 18.1 18.0 17.7 17.5 15.1 12.4 6.0 5.427 10.5 7.6 10.6 13.1 18.8 18.9 17.7 17.5 15.1 12.2 5.8 4.828 9.6 7.9 11.4 15.0 20.2 19.0 18.1 17.1 15.3 13.2 6.6 5.029 8.8 — 12.8 15.2 19.9 19.2 18.7 17.1 15.4 12.4 8.2 4.030 9.4 — 14.6 15.5 19.0 19.1 19.3 17.4 15.1 10.3 8.3 2.731 11.0 — 14.8 — 18.4 — 19.7 17.4 — 7.9 — 3.1

MEAN 7.2 7.5 10.3 13.0 16.4 18.4 18.3 17.9 16.0 13.9 6.8 6.5MAX 11.2 10.1 14.8 15.5 20.5 21.4 19.7 19.1 18.4 17.0 9.8 8.4MIN 4.4 4.3 7.5 8.9 12.6 15.8 17.7 16.7 14.6 7.9 4.6 2.7

HCTP – 14206958 – Hedges Creek at Tualatin Community Park at Tualatin, Oregon [RM 0.3]

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TRT – 14206960 – TUALATIN RIVER AT TUALATIN, OREGON [RM 8.9]Latitude: 45 23 14 Longitude: 122 45 46 Source Agency: District 18 Watermaster



10 4.0 4.6 7.0 8.9 10.2 18.8 20.7 19.8 17.3 14.3 7.5 6.011 3.8 4.6 7.6 9.7 10.2 18.8 21.1 19.4 17.5 14.0 7.7 5.912 4.0 4.7 8.0 9.8 10.6 18.4 21.1 19.1 17.3 13.5 7.6 6.013 4.4 5.1 8.2 9.8 11.1 18.0 20.9 19.1 16.9 13.3 7.5 6.114 5.1 5.3 8.2 9.8 11.7 17.8 20.8 19.3 16.6 13.1 7.7 6.115 5.7 5.6 8.3 9.6 11.8 17.8 21.1 19.4 16.0 12.4 8.0 6.216 5.9 6.1 8.2 9.3 11.7 18.0 21.1 19.3 15.8 12.3 8.1 5.617 5.4 6.4 8.2 9.3 11.6 18.4 21.0 19.6 15.6 12.7 8.0 5.418 5.0 6.3 7.9 9.6 11.5 18.1 21.3 19.7 15.7 12.8 8.1 5.319 4.6 6.2 7.6 9.7 11.7 17.4 21.6 19.7 15.7 13.1 8.0 5.320 4.4 6.1 7.4 9.8 11.8 17.0 21.9 19.4 15.7 13.4 7.7 5.521 4.4 6.5 7.5 9.5 12.1 16.8 22.3 19.5 15.7 13.9 7.1 5.422 4.5 6.6 7.8 9.8 12.9 16.3 22.5 19.4 15.8 14.2 6.3 5.323 5.0 6.8 7.9 9.9 13.9 16.1 22.2 19.0 15.9 14.0 6.0 5.724 5.6 6.4 7.8 9.6 14.6 16.2 21.9 19.0 16.0 13.7 5.9 5.925 6.2 5.6 7.6 9.4 15.0 16.7 21.7 19.2 16.1 13.5 5.6 5.726 7.1 4.5 7.7 8.9 15.3 17.4 21.7 19.1 16.2 13.4 5.2 5.327 7.6 4.1 7.7 9.0 15.9 18.1 21.8 18.9 16.3 13.4 4.8 5.128 7.8 4.3 8.0 9.3 16.5 18.6 22.1 18.9 16.6 13.6 5.1 4.829 7.2 — 8.3 9.9 17.0 19.2 22.5 19.0 16.4 13.0 5.5 4.330 6.7 — 8.9 10.5 16.8 19.3 22.7 19.1 16.4 12.0 5.4 3.731 7.1 — 9.6 — 16.7 — 22.7 19.0 — 10.7 — 3.4

MEAN 5.6 5.8 7.4 9.2 12.6 17.9 21.1 19.8 17.0 14.0 7.2 5.7MAX 7.8 7.8 9.6 10.5 17.0 19.7 22.7 22.3 19.4 16.5 9.7 6.6MIN 3.8 4.1 4.9 7.0 10.2 16.1 18.7 18.9 15.6 10.7 4.8 3.4

TRT – 14206960 – Tualatin River at Tualatin, Oregon [RM 8.9]

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SCBR – SAUM CREEK AT BORLAND ROAD [RM 0.6]Latitude: 45 22 32 Longitude: 122 43 22 Source Agency: District 18 Watermaster



10 6.0 6.8 10.2 11.5 11.4 15.4 16.4 16.9 15.2 12.8 8.211 6.1 6.0 10.4 11.7 11.9 15.3 17.1 16.5 15.5 12.3 8.912 7.0 5.9 10.4 11.8 12.7 14.9 17.2 16.1 15.3 12.3 8.813 7.6 7.3 10.4 11.6 12.7 14.7 17.3 15.8 14.3 12.4 8.214 7.9 8.4 10.3 10.9 13.2 14.6 16.6 15.9 14.1 12.3 8.215 7.1 8.2 10.4 11.0 12.1 15.0 17.0 16.7 13.5 11.8 8.716 6.9 8.4 10.0 11.5 10.4 15.3 17.2 16.3 13.4 12.0 8.917 6.5 8.0 9.3 11.5 9.6 16.0 16.4 16.1 13.3 12.9 8.918 6.1 8.5 9.2 10.8 9.9 15.8 16.3 16.5 13.2 13.1 9.519 5.2 9.0 9.1 10.9 11.3 14.3 16.7 16.5 13.7 13.2 9.120 5.6 8.7 9.7 11.7 12.3 13.9 16.9 15.5 13.5 13.9 6.721 6.2 9.3 9.9 11.3 13.4 13.8 17.7 15.4 13.1 14.5 6.522 6.5 8.9 10.1 11.1 14.8 13.3 18.0 15.8 13.3 14.7 5.223 7.3 7.9 9.4 11.0 14.9 13.3 17.7 15.1 13.5 13.9 5.824 8.2 5.8 8.8 10.7 15.4 13.3 16.6 14.5 13.5 12.2 6.325 9.4 5.5 9.7 10.1 14.9 14.1 16.2 14.7 13.6 11.5 6.426 10.5 6.0 9.9 10.3 14.2 15.4 16.2 15.6 13.9 11.5 6.727 9.6 7.3 9.8 10.5 14.3 16.5 16.0 16.1 14.0 11.5 6.228 9.2 7.2 10.0 11.7 15.4 16.7 16.4 15.4 14.4 12.0 7.029 8.8 — 10.4 12.1 15.4 17.3 16.8 15.6 14.5 12.1 8.730 9.6 — 11.4 12.4 15.4 16.8 17.2 15.8 14.3 10.7 8.731 10.5 — 11.9 — 14.7 — 17.3 15.7 — 9.1 —

MEAN 7.7 7.6 9.4 10.8 12.8 15.2 16.5 16.0 14.4 12.9 7.5 8.5MAX 10.5 9.7 11.9 12.4 15.4 17.3 18.0 17.0 16.3 14.7 9.5 8.5MIN 5.2 5.5 7.0 8.7 9.6 13.3 14.8 14.5 13.1 9.1 5.2 8.4

SCBR – Saum Creek at Borland Road [RM 0.6]

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LOCS – 14206990 – TUALATIN RIVER AT OSWEGO CANAL NEAR LAKE OSWEGO, OREGON [RM 6.7]Latitude: 45 22 57 Longitude: 122 43 17 Source Agency: District 18 Watermaster



10 5.8 6.5 9.0 10.8 12.3 20.5 22.0 22.0 18.8 16.2 9.311 5.6 6.4 9.5 11.6 12.3 20.4 22.4 21.5 19.3 15.9 9.612 5.8 6.6 9.9 11.8 12.6 20.3 22.7 21.2 19.3 15.5 9.513 6.3 7.0 10.2 11.8 13.2 19.8 22.6 21.1 19.0 15.2 9.314 7.0 7.2 10.2 11.8 13.7 19.6 22.2 21.1 18.6 15.2 9.515 7.5 7.4 10.2 11.6 13.8 19.7 22.5 21.4 18.1 14.5 9.716 7.7 8.0 10.2 11.4 13.6 20.0 22.7 21.0 17.8 14.2 9.817 7.3 8.3 10.1 11.2 13.4 20.3 22.4 21.2 17.4 14.5 9.918 6.9 8.2 9.9 11.6 13.4 20.2 22.5 21.6 17.5 14.6 10.019 6.5 8.1 9.6 11.7 13.7 19.2 22.9 21.6 17.6 14.9 9.920 6.2 8.0 9.4 11.8 13.9 18.8 23.3 21.1 17.4 15.3 9.321 6.1 8.4 9.5 11.5 14.2 18.6 23.7 21.1 17.5 15.7 8.922 6.3 8.5 9.8 11.7 15.0 18.2 24.0 21.2 17.5 16.0 8.323 6.8 8.6 9.9 11.9 15.9 17.9 23.9 20.8 17.6 15.8 7.924 7.4 8.3 9.8 11.6 16.6 17.9 23.4 20.6 17.7 15.4 7.925 8.0 7.5 9.6 11.3 16.8 18.4 23.1 20.8 17.8 15.126 9.1 6.5 9.7 10.9 17.2 19.0 23.0 21.0 17.9 15.127 9.5 6.0 9.7 10.9 17.7 19.8 23.0 20.8 18.1 15.128 9.8 6.1 9.9 11.3 18.5 20.3 23.2 20.5 18.3 15.429 9.2 — 10.2 11.9 18.9 20.9 23.7 20.6 18.3 15.030 8.7 — 10.8 12.4 18.7 21.1 24.0 20.8 18.0 14.031 9.4 — 11.5 — 18.5 — 24.2 20.8 — 12.7 —

MEAN 7.5 7.8 9.3 11.1 14.6 19.8 22.5 21.6 18.8 15.9 9.5MAX 9.8 9.9 11.5 12.4 18.9 21.6 24.2 23.9 21.1 18.1 11.6MIN 5.6 6.0 6.7 9.0 12.3 17.9 20.1 20.5 17.4 12.7 7.9

LOCS – 14206990 – Tualatin River at Oswego Canal near Lake Oswego, Oregon [RM 6.7]

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SPBR – 14211116 – SPRINGBROOK CR AT IRON MOUNTAIN RD NEAR LAKE OSWEGO, OREGON [RM 0.18]Latitude: 45 24 46 Longitude: 122 42 13 Source Agency: District 18 Watermaster



10 8.1 8.8 9.8 10.5 10.5 12.8 13.9 14.3 14.7 12.6 10.7 8.111 7.9 8.3 10.0 10.9 10.9 12.8 14.1 14.2 15.0 12.0 11.1 8.712 7.5 8.4 10.3 10.8 11.1 12.6 14.2 14.1 14.1 12.6 10.5 9.113 8.3 9.1 10.3 10.6 11.3 12.9 14.1 14.1 13.6 12.4 10.5 8.514 8.6 9.6 10.1 10.1 11.5 12.7 13.8 14.5 13.6 12.5 10.8 7.815 8.2 9.0 10.1 10.4 10.8 12.8 14.1 14.6 13.1 12.0 10.3 8.616 8.1 8.6 9.7 10.6 10.0 13.2 13.9 14.2 13.3 12.8 9.9 8.517 7.9 7.7 9.2 10.5 8.9 13.6 13.6 14.4 13.1 13.8 10.1 8.918 7.9 8.5 9.2 10.2 9.2 13.3 13.8 14.6 13.1 13.1 10.9 8.819 7.7 9.0 9.3 10.3 10.5 12.5 14.0 14.3 13.7 13.8 8.2 8.820 8.1 8.9 9.8 10.8 11.2 13.0 14.0 13.8 13.1 14.2 7.7 9.021 8.4 9.5 9.6 10.5 11.9 12.8 14.5 14.0 13.0 14.6 8.3 9.322 7.5 9.1 9.6 10.5 12.5 12.3 14.5 14.0 13.4 14.4 7.5 8.823 8.4 8.3 9.1 10.4 13.0 12.3 14.1 13.6 13.4 12.8 8.5 8.724 9.0 6.8 8.9 10.0 13.1 12.5 13.8 13.6 13.6 11.9 8.4 8.025 9.9 7.2 9.7 9.7 12.5 13.0 13.6 13.9 13.7 12.1 8.0 7.726 10.6 7.8 9.7 9.8 12.1 13.8 13.9 14.2 13.9 12.4 8.4 7.827 9.5 8.6 9.3 10.1 12.5 14.3 14.0 14.2 14.0 12.4 8.6 6.928 9.3 8.3 9.7 10.8 13.1 14.3 14.4 14.0 13.9 13.0 9.2 7.129 8.8 — 10.3 11.0 12.9 14.8 14.7 14.2 13.7 11.7 9.4 6.030 9.6 — 11.0 11.2 12.7 14.0 14.8 14.5 13.5 10.4 9.5 6.831 10.4 — 11.0 — 12.5 — 14.6 14.2 — 9.1 — 6.8

MEAN 8.7 8.6 9.4 10.1 11.3 13.1 13.9 14.2 13.9 12.9 9.4 8.4MAX 10.6 9.7 11.0 11.2 13.1 14.8 14.8 14.6 15.0 14.6 11.1 9.7MIN 7.5 6.8 8.0 8.3 8.9 12.1 12.9 13.6 13.0 9.1 7.5 6.0

SPBR – 14211116 – Springbrook Creek at Iron Mountain Rd near Lake Oswego, Oregon [RM 0.18]

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The following data are provisional and have not been fully reviewed or edited. Preliminary review of the field data by the U.S. Geological Survey indicates that there may be some

intermittent problems with the quality of the dissolved oxygen data for 2003.

APPENDIX G—Hagg Lake Monitoring ProgramG-2 2003 Tualatin River Flow Management Report

HAGG LAKE MONITORING PROGRAM 2003 — DATA LIST

DATA TABLE PAGE

Hagg Lake

Physical and chemical data, including field data G–3

Bacteriological data G–7

Phytoplankton density and biovolume G–8

Zooplankton density G–13

Zooplankton length frequency G–17

Petroleum hydrocarbons G–7

Hagg Lake Tributaries

Physical and chemical data, including field data G–18

Bacteriological data G–22

Benthic Invertebrate Index of Biological Integrity (BIBI) G–23

Benthic community indicators of biological condition G–23

Benthic invertebrate density G–24

Weather Observations G–26

APPENDIX G—Hagg Lake Monitoring Program2003 Tualatin River Flow Management Report G-3

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licat

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; T

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en; P

P=

phyt

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acti=

bact

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; Chl

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loro

phyl

l a.]

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07/1

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07/1

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GG

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KE

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3 —

PH

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ICA

L A

ND

CH

EM

ICA

L D

ATA

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ON

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T 3

OF

4)

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revi

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lved

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urbi

d.=t

urbi

dity

; Tra

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r=tr

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aran

cy; D

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=dup

licat

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mpl

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otal

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pho

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rus;

SR

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olub

le re

activ

e ph

osph

orus

; T

KN

=tot

al K

jeld

ahl n

itrog

en; P

P=

phyt

opla

nkto

n; B

acti=

bact

eria

; Chl

or a

=ch

loro

phyl

l a.]

Dat

eT

ime

FIE

LD

DA

TAR

ES

ULT

S O

F C

HE

MIC

AL

AN

ALY

SE

S

Air

Tem

p(º

C)

An

alys

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Wat

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emp

(ºC

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HD

O(m

g/L)

Co

nd

.(µ

S/c

m)

Turb

id.

(NT

U)

Tran

spar

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l P(m

g/L

as

P)

SR

P(m

g/L

as

P)

Am

mo

nia

(mg/

L as

N

)

TK

N(m

g/L

as

N)

Ch

loro

ph

yll a

(µg/

L)


09/2

2/03

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0.0

10.0

7.63

11.2

868

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0

09/2

2/03

10:3

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cti

0.0

10.0

7.63

11.2

868

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0

09/2

2/03

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HAGG LAKE MONITORING 2003 — PETROLEUM HYDROCARBON ANALYSES

DateGasoline Range

(µg/L)Diesel Range

(µg/L)

5/20/2003 <50 <100

HAGG LAKE MONITORING 2003 — BACTERIOLOGICAL DATA

Date TimeSample Depth

(m)E. coli /100 ml

(MPN)Total Coliform/100 ml

(MPN)

01/28/03 11:50 0.0 1 111

01/28/03 11:45 1.0 4 187

02/04/03 10:35 0.0 4 272

02/04/03 10:30 1.0 3 154

03/25/03 11:30 0.0 <1 18

03/25/03 11:25 1.0 <1 16

04/22/03 11:11 0.0 <1 <1

04/22/03 11:06 1.0 <1 <1

05/13/03 10:55 0.0 <1 <1

05/13/03 10:50 1.0 <1 2

05/20/03 10:48 0.0 <1 16

05/20/03 10:40 1.0 <1 10

06/04/03 9:55 0.0 <1 39

06/04/03 9:42 1.0 <1 21

06/23/03 11:20 0.0 <1 20

06/23/03 11:15 1.0 <1 14

07/14/03 11:10 0.0 <1 10

07/14/03 11:05 1.0 <1 6

07/29/03 10:50 0.0 1 22

07/29/03 10:45 1.0 <1 20

08/11/03 10:57 0.0 <1 28

08/11/03 10:50 1.0 <1 12

08/25/03 11:20 0.0 <1 20

08/25/03 11:16 1.0 <1 34

09/22/03 10:36 0.0 <1 18

09/22/03 10:30 1.0 <1 24

10/06/03 11:14 0.0 <1 9

10/06/03 11:04 1.0 <1 6

10/20/03 11:25 0.0 <1 59

10/20/03 11:17 1.0 1 58

12/08/03 12:03 0.0 7 36

12/08/03 12:05 1.0 13 47


HAGG LAKE MONITORING 2003 — PHYTOPLANKTON DENSITY & BIOVOLUME (SHEET 1 OF 5)

Date Species GenusDensity Biovolume

number/mL percent µm3/mL percent

1/28/2003 Trophic State Index= 32.51/28/2003 Gomphonema angustatum Baccillariophyta (Diatoms) 8 0.7 1,450 1.6

1/28/2003 Melosira italica Baccillariophyta (Diatoms) 8 0.7 15,173 16.9

1/28/2003 Rhoicosphenia curvata Baccillariophyta (Diatoms) 8 0.7 942 1.1

1/28/2003 Stephanodiscus astraea minutula Baccillariophyta (Diatoms) 105 9.5 36,644 40.8

1/28/2003 Stephanodiscus hantzschii Baccillariophyta (Diatoms) 8 0.7 966 1.1

1/28/2003 Ankistrodesmus falcatus Chlorophyta (Green Algae) 24 2.2 604 0.7

1/28/2003 Achnanthes lanceolata Chrysophyta (Golden-brown algae) 8 0.7 1,450 1.6

1/28/2003 Chrysococcus rufescens Chrysophyta (Golden-brown algae) 8 0.7 685 0.8

1/28/2003 Kephyrion littorale Chrysophyta (Golden-brown algae) 16 1.5 1,530 1.7

1/28/2003 Cryptomonas erosa Cryptophyta 24 2.2 12,564 14.0

1/28/2003 Rhodomonas minuta Cryptophyta 886 80.3 17,718 19.7

1/28/2003 Total 1,103 100 89,725 100

2/4/2003 Trophic State Index= 39.92/4/2003 Diatoma hiemale mesodon Baccillariophyta (Diatoms) 4 0.9 3,503 1.4

2/4/2003 Frustulia rhomboides Baccillariophyta (Diatoms) 4 0.9 4,729 1.9


2/4/2003 Nitzschia sp. Baccillariophyta (Diatoms) 4 0.9 525 0.2

2/4/2003 Stephanodiscus astraea Baccillariophyta (Diatoms) 4 0.9 35,213 14.0



2/4/2003 Achnanthes lanceolata Chrysophyta (Golden-brown algae) 9 1.8 1,576 0.6

2/4/2003 Achnanthes linearis Chrysophyta (Golden-brown algae) 13 2.8 1,734 0.7

2/4/2003 Achnanthes minutissima Chrysophyta (Golden-brown algae) 4 0.9 219 0.1

2/4/2003 Asterionella formosa Chrysophyta (Golden-brown algae) 4 0.9 6,743 2.7

2/4/2003 Diatoma hiemale mesodon Baccillariophyta (Diatoms) 4 0.9 3,503 1.4



2/4/2003 Peridinium cinctum Pyrrhophyta (Dinoflagellates) 4 0.9 18,390 7.3

2/4/2003 Total 477 100 252,396 100

3/25/2003 Trophic State Index=52.8 3/25/2003 Ankistrodesmus falcatus Chlorophyta (Green Algae) 63 3.6 1,582 0.1

3/25/2003 Chlamydomonas sp. Chlorophyta (Green Algae) 16 0.9 5,143 0.3

3/25/2003 Asterionella formosa Chrysophyta (Golden-brown algae) 1,456 82.9 1,345,214 89.6


3/25/2003 Rhodomonas minuta Cryptophyta 47 2.7 949 0.1


3/25/2003 Total 1,757 100 1,501,640 100

4/22/2003 Trophic State Index= 36.04/22/2003 Synedra rumpens Baccillariophyta (Diatoms) 2 1.0 263 0.2



4/22/2003 Dinobryon sertularia Chrysophyta (Golden-brown algae) 160 81.0 136,856 93.2



4/22/2003 Total 197 100 146,863 100


5/13/2003 Trophic State Index= 19.95/13/2003 Synedra rumpens Baccillariophyta (Diatoms) 3 3.0 489 3.3

5/13/2003 Ankistrodesmus falcatus Chlorophyta (Green Algae) 58 49.3 2,019 13.6


5/13/2003 Dinobryon sertularia Chrysophyta (Golden-brown algae) 5 4.5 624 4.2

5/13/2003 Kephyrion littorale Chrysophyta (Golden-brown algae) 2 1.5 166 1.1



5/13/2003 Total 117 100 14,818 100

5/20/2003 Trophic State Index= 32.75/20/2003 Fragilaria crotonensis Baccillariophyta (Diatoms) 6 3.8 41,199 44.8



5/20/2003 Dinobryon bavaricum Chrysophyta (Golden-brown algae) 6 3.8 879 1.0



5/20/2003 Mallomonas sp. Chrysophyta (Golden-brown algae) 36 23.8 16,281 17.7




5/20/2003 Total 150 100 91,890 100

6/4/2003 Trophic State Index= 37.16/4/2003 Synedra radians Baccillariophyta (Diatoms) 11 2.9 18,241 10.8

6/4/2003 Synedra rumpens Baccillariophyta (Diatoms) 4 1.0 503 0.3

6/4/2003 Achnanthes minutissima Chrysophyta (Golden-brown algae) 25 6.7 1,258 0.7


6/4/2003 Dinobryon bavaricum Chrysophyta (Golden-brown algae) 29 7.7 5,175 3.1




6/4/2003 Total 374 100 169,220 100

6/23/2003 Trophic State Index= 46.26/23/2003 Cyclotella comta Baccillariophyta (Diatoms) 12 1.8 26,420 4.4

6/23/2003 Cyclotella stelligera Baccillariophyta (Diatoms) 175 27.3 9,602 1.6

6/23/2003 Fragilaria crotonensis Baccillariophyta (Diatoms) 111 17.3 427,234 70.7

6/23/2003 Gomphonema angustatum Baccillariophyta (Diatoms) 6 0.9 1,047 0.2

6/23/2003 Synedra radians Baccillariophyta (Diatoms) 163 25.5 58,659 9.7






6/23/2003 Ceratium hirundinella Pyrrophycophyta (Dinoflagellates) 6 0.9 57,030 9.4

6/23/2003 Total 640 100 604,295 100

HAGG LAKE MONITORING 2003 — PHYTOPLANKTON DENSITY & BIOVOLUME (CONTINUED) (SHEET 2 OF 5)






7/14/2003 Navicula cryptocephala Baccillariophyta (Diatoms) 2 1.8 335 0.2

7/14/2003 Neidium affine Baccillariophyta (Diatoms) 2 1.8 15,540 8.6



7/14/2003 Oocystis pusilla Chlorophyta (Green Algae) 2 1.8 196 0.1


7/14/2003 Asterionella formosa Chrysophyta (Golden-brown algae) 4 3.6 797 0.4

7/14/2003 Unidentified flagellate — 2 1.8 36 0.0

7/14/2003 Total 101 100 181,436 100

8/11/2003 Trophic State Index= 37.78/11/2003 Cyclotella stelligera Baccillariophyta (Diatoms) 2 0.8 117 0.1


8/11/2003 Nitzschia paleacea Baccillariophyta (Diatoms) 4 1.7 416 0.2





8/11/2003 Chlamydomonas sp. Chlorophyta (Green Algae) 2 0.8 690 0.4

8/11/2003 Elakatothrix gelatinosa Chlorophyta (Green Algae) 19 7.5 1,123 0.6

8/11/2003 Oocystis pusilla Chlorophyta (Green Algae) 2 0.8 229 0.1

8/11/2003 Sphaerocystis schroeteri Chlorophyta (Green Algae) 2 0.8 594 0.3






8/11/2003 Anabaena flos-aquae Cyanophyta (Blue-green algae) 17 6.7 16,979 9.2

8/11/2003 Anabaena planctonica Cyanophyta (Blue-green algae) 23 9.2 117,336 63.5

8/11/2003 Glenodinium sp. Pyrrophycophyta (Dinoflagellates) 2 0.8 1,486 0.8

8/11/2003 Total 255 100 184,811 100


8/25/2003 Cyclotella stelligera Baccillariophyta (Diatoms) 23 15.0 1,248 1.4


8/25/2003 Navicula decussis Baccillariophyta (Diatoms) 2 1.3 363 0.4

8/25/2003 Nitzschia dissipata Baccillariophyta (Diatoms) 2 1.3 509 0.6

8/25/2003 Nitzschia frustulum Baccillariophyta (Diatoms) 6 3.8 885 1.0



8/25/2003 Botryococcus braunii Chlorophyta (Green Algae) 2 1.3 5,446 6.3

8/25/2003 Sphaerocystis schroeteri Chlorophyta (Green Algae) 4 2.5 794 0.9









8/25/2003 Total 151 100 86,616 100





9/22/2003 Trophic State Index= 31.2 9/22/2003 Cyclotella comta Baccillariophyta (Diatoms) 7 1.8 14,837 19.8

9/22/2003 Cymbella lunata Baccillariophyta (Diatoms) 3 0.9 2,811 3.8

9/22/2003 Cymbella minuta Baccillariophyta (Diatoms) 7 1.8 2,418 3.2


9/22/2003 Navicula sp. Baccillariophyta (Diatoms) 3 0.9 490 0.7

9/22/2003 Nitzschia communis Baccillariophyta (Diatoms) 3 0.9 147 0.2

9/22/2003 Nitzschia paleacea Baccillariophyta (Diatoms) 3 0.9 320 0.4





9/22/2003 Asterionella formosa Chrysophyta (Golden-brown algae) 3 0.9 719 1.0




9/22/2003 Total 356 100 74,925 100

10/6/2003 Trophic State Index= 39.210/6/2003 Fragilaria crotonensis Baccillariophyta (Diatoms) 3 0.9 2,339 1.0


10/6/2003 Navicula gregaria Baccillariophyta (Diatoms) 3 0.9 974 0.4

10/6/2003 Nitzschia tryblionella Baccillariophyta (Diatoms) 3 0.9 529 0.2


10/6/2003 Chlamydomonas sp. Chlorophyta (Green Algae) 3 0.9 905 0.4

10/6/2003 Crucigenia quadrata Chlorophyta (Green Algae) 3 0.9 237 0.1








10/6/2003 Total 295 100 228,239 100

10/20/2003 Trophic State Index= 44.610/20/2003 Diploneis elliptica Baccillariophyta (Diatoms) 3 0.9 764 0.2


10/20/2003 Gomphonema angustatum Baccillariophyta (Diatoms) 3 0.9 529 0.1

10/20/2003 Melosira ambigua Baccillariophyta (Diatoms) 9 2.8 10,383 2.1



10/20/2003 Navicula cryptocephala veneta Baccillariophyta (Diatoms) 3 0.9 279 0.1

10/20/2003 Navicula minuscula Baccillariophyta (Diatoms) 3 0.9 132 0.0


10/20/2003 Nitzschia constricta Baccillariophyta (Diatoms) 3 0.9 1,704 0.4

10/20/2003 Nitzschia frustulum Baccillariophyta (Diatoms) 3 0.9 353 0.1



10/20/2003 Sphaerocystis schroeteri Chlorophyta (Green Algae) 3 0.9 3,291 0.7


10/20/2003 Kephyrion sp. Chrysophyta (Golden-brown algae) 3 0.9 185 0.0



10/20/2003 Total 311 100 482,999 100





12/8/2003 Trophic State Index= 37.112/8/2003 Gomphonema angustatum Baccillariophyta (Diatoms) 5 2.6 978 0.6






12/8/2003 Tabellaria fenestrata Baccillariophyta (Diatoms) 11 5.1 44,339 26.2





12/8/2003 Kephyrion littorale Chrysophyta (Golden-brown algae) 14 6.4 1,291 0.8

12/8/2003 Kephyrion sp. Chrysophyta (Golden-brown algae) 11 5.1 685 0.4






12/8/2003 Total 212 100 169,100 100





HAGG LAKE MONITORING 2003 — ZOOPLANKTON DENSITY (SHEET 1 OF 4)

Zooplankton 28-Jan-03 4-Feb-03 25-Mar-03 4-Apr-03Time Sampled 11:00 10:35 11:25 11:20

Depth Sampled (meters) 26 26 28 32

Volume (m3) 0.84316 0.84316 0.90802 1.03774

Genus Species CodeDensity ±SE

(number/m3)

Density ±SE

(number/m3)

Density ±SE

(number/m3)

Density ±SE

(number/m3)

CL

AD

OC

ER

A

Bosmina longirostris 6103101 2555.5 ± 254.3 14725.5 ±1057.2 394.7 ± 74.6 77.1 ± 34.5

Chydorus sphaericus 6107101 — — — —

Daphnia galeata mendotae 6102111 50.6 ± 35.8 — — 73.9 ± 33.8

Daphnia pulicaria * 6102116 253 ± 80 607.2 ± 214.7 1057.2 ± 122.1 1773.6 ± 165.4

Daphnia rosea * 6102114 75.9 ± 43.8 227.7 ± 131.5 422.9 ± 77.2 295.6 ± 67.5

Diaphanosoma brachyurum 6102111 — — — —

Eurycercus laellatus 6107181 — — — —

Leptodora kindti * 6108101 — — — —

Total cladocerans 2935 ± 272.5 15560.5 ±1086.8 1874.8 ± 162.6 2220.2 ± 185

CO

PE

PO

DA

Copepod nauplii 6170090 3162.7 ± 282.9 8273.6 ± 792.5 902.2 ± 112.8 1588.1 ± 156.5

Cyclops bicuspidatus th. 6128101 885.6 ± 149.7 2353 ± 422.6 465.2 ± 81 1310.5 ± 142.1

Cyclopoid copepodites 6128000 2682 ± 260.5 8273.6 ± 792.5 1635.2 ± 151.8 1742.3 ± 163.9

Diaptomid copepodites 6183100 3010.9 ± 276 8045.9 ± 781.5 578 ± 90.3 262.1 ± 63.6

Diaptomus reighardi 6183184 809.7 ± 143.1 531.3 ± 200.8 126.9 ± 42.3 431.7 ± 81.6

Epischura nevadensis * 6182031 — — — —

Epischurid copepodites * 6182030 — — — —

Microcyclops varians 6128103 — — — —

Total copepods 10550.8 ± 516.7 27477.5 ±1444.2 3707.4 ± 228.6 5334.7 ± 286.8

RO

TIF

ER

A &

PR

OT

ISTA

Anuraeopsis sp. 4501150 — — — —

Ascomorpha ovalis 4508023 569.3 ± 147 189.8 ± 60 42.3 ± 24.4 789.4 ± 139.5

Asplanchna priodonta 4512011 — — 24.7 ± 24.7

Brachionus calyciflorus 4501042 — — 14.1 ± 14.1 —

Collotheca pelagica 4519011 75.9 ± 53.7 265.7 ± 71 70.5 ± 31.5 296 ± 85.5

Conochiloides natans 4518022 — — — —

Difflugia sp. 1000100 38 ± 38 56.9 ± 32.9 366.5 ± 71.9 —

Filinia terminalis 4515011 417.5 ± 125.9 360.5 ± 82.7 155.1 ± 46.8 641.4 ± 125.8

Gastropus stylifer 4508011 — — — —

Keratella cochlearis 4501013 1328.3 ± 224.5 664.2 ± 112.3 253.7 ± 59.8 1702.2 ± 204.9

Keratella hiemalis 4501011 38 ± 38 38 ± 26.8 14.1 ± 14.1 —

Keratella quadrata 4501012 — — — —

Kellicottia longispina 4501051 417.5 ± 125.9 246.7 ± 68.4 14.1 ± 14.1 740.1 ± 135.1

Lecane sp. 4502010 — — — —

peritrich colony 1000500 — — — —

Philodina sp. 4520020 — — — —

Ploesoma truncatum 4512031 — — — —

Polyarthra vulgaris 4513011 0 ± 0 56.9 ± 32.9 84.6 ± 34.5 1480.1 ± 191.1

Polyarthra major 4513015 417.5 ± 125.9 151.8 ± 53.7 408.8 ± 75.9 4810.5 ± 344.5

Pompholyx sulcata 4515031 — — — —

Synchaeta oblonga 4513021 645.2 ± 156.5 455.4 ± 93 408.8 ± 75.9 937.4 ± 152.1

Trichocerca multicrinis 4507017 — — — 24.7 ± 24.7

Trichocerca similis 4507022 — — — —

Total rotifers and protozoans 3947.1 ± 387 2485.9 ± 217.2 1832.6 ± 160.7 11446.4 ± 531.4

MISCCypridopsis vidua 6135271 — — — —

Fish larvae 8717090 — — — —

TOTA

L Z

OO

PLA

NKTO

N Total Density 17432.8 ± 690.7 45523.9 ±1723.1 7414.8 ± 323.3 19001.3 ± 615.2

Density of Edible Zooplankton (*) 328.9 ± 91.2 835 ± 251.7 1480.1 ± 144.4 2069.2 ± 178.6

% Edible Zooplankton 2.4 1.9 26.5 27.4

Biovolume Measured (in mls): 3 2 0.5 5

Biovolume Density (ml/m3): 3.56 2.37 0.55 4.82


HAGG LAKE MONITORING 2003 — ZOOPLANKTON DENSITY (CONTINUED) (SHEET 2 OF 4)

Zooplankton 13-May-03 20-May-03 4-Jun-03 23-Jun-03Time Sampled 11:50 10:50 10:50 10:50


Volume (m3) 1.07017 1.07017 0.97288 0.74587


(number/m3)

Density ±SE

(number/m3)

Density ±SE

(number/m3)

Density ±SE

(number/m3)

CL

AD

OC

ER

A

Bosmina longirostris 6103101 279.1 ± 105.5 — 32.9 ± 32.9 42.9 ± 42.9

Chydorus sphaericus 6107101 — — 32.9 ± 32.9 42.9 ± 42.9

Daphnia galeata mendotae 6102111 443.3 ± 133 150.7 ± 77.5 65.8 ± 46.5 919.8 ± 198.7

Daphnia pulicaria * 6102116 8645.2 ± 587.1 6329.6 ± 502.4 657.8 ± 147.1 1379.8 ± 243.3

Daphnia rosea * 6102114 1995.1 ± 282 1054.9 ± 205.1 131.6 ± 65.8 574.9 ± 157.1



Leptodora kindti * 6108101 — — 32.9 ± 32.9 42.9 ± 42.9

Total cladocerans 11362.7 ± 673.1 7535.3 ± 548.1 953.9 ± 177.1 3003.2 ± 359

CO

PE

PO

DA

Copepod nauplii 6170090 3388.9 ± 367.6 6618.3 ± 513.7 8848 ± 539.5 11197.6 ± 693.1

Cyclops bicuspidatus th. 6128101 1634.6 ± 255.3 1116.3 ± 211 1315.7 ± 208 1244.2 ± 231

Cyclopoid copepodites 6128000 956.9 ± 195.3 598 ± 154.4 756.5 ± 157.7 1201.3 ± 227

Diaptomid copepodites 6183100 956.9 ± 195.3 1873.9 ± 273.3 2170.9 ± 267.2 3732.5 ± 400.2

Diaptomus reighardi 6183184 438.6 ± 132.2 518.3 ± 143.8 822.3 ± 164.5 1587.4 ± 261



Microcyclops varians 6128103 — — — 128.7 ± 74.3

Total copepods 7375.8 ± 542.3 10724.8 ± 653.9 13913.4 ± 676.5 19091.7 ± 905

RO

TIF

ER

A &

PR

OT

ISTA


Ascomorpha ovalis 4508023 3189.5 ± 504.3 1355.6 ± 232.5 1184.1 ± 394.7 171.6 ± 85.8

Asplanchna priodonta 4512011 — — 1085.4 ± 189 729.3 ± 176.9

Brachionus calyciflorus 4501042 — — — —

Collotheca pelagica 4519011 159.5 ± 112.8 — — 257.4 ± 105.1


Difflugia sp. 1000100 — — 657.8 ± 294.2 —

Filinia terminalis 4515011 159.5 ± 112.8 39.9 ± 39.9 394.7 ± 227.9 ± 171.6 ± 85.8

Gastropus stylifer 4508011 — — — ± 42.9 ± 42.9

Keratella cochlearis 4501013 18977.7 ±1230.1 5462.1 ± 466.7 6841.6 ± 948.8 ±1887.7 ± 284.6

Keratella hiemalis 4501011 — — — —


Kellicottia longispina 4501051 1834 ± 382.4 1834 ± 270.4 11183.3 ±1213 ±7422.2 ± 564.3

Lecane sp. 4502010 — 39.9 ± 39.9 — —


Philodina sp. 4520020 — — — —


Polyarthra vulgaris 4513011 1515 ± 347.6 2471.9 ± 313.9 5920.6 ± 882.6 1930.6 ± 287.8

Polyarthra major 4513015 9090.2 ± 851.4 7017 ± 528.9 37760.1 ±2228.9 1029.7 ± 210.2


Synchaeta oblonga 4513021 ± 239.2 ± 138.1 1435.3 ± 239.2 1315.7 ± 416.1 429 ± 135.7

Trichocerca multicrinis 4507017 79.7 ± 79.7 39.9 ± 39.9 — —


Total rotifers and protozoans 35244.4 ±1676.4 19695.4 ± 886.1 66343.3 ±3026.1 14072.1 ± 777


Fish larvae 8717090 13.1 ± 3.5 — — —

TOTA

L Z

OO

PLA

NKTO

N Total Density 53996 ±1774.4 37968.6 ±1221.6 81210.6 ±2696.8 36167 ±1245.7

Density of Edible Zooplankton (*) 10640.3 ± 634.9 7384.6 ± 542.6 822.3 ± 164.5 1997.6 ± 292.7

% Edible Zooplankton 143.9 40.4 5.5 9

Biovolume Measured (in mls): 4.5 4 3.5 1.5

Biovolume Density (ml/m3): 4.2 3.74 3.6 2


HAGG LAKE MONITORING 2003 — ZOOPLANKTON DENSITY (CONTINUED) (SHEET 3 OF 4)

Zooplankton 14-Jul-03 29-Jul-03 11-Aug-03 25-Aug-03Time Sampled 11:20 11:00 11:00 11:25


Volume (m3) 0.97288 0.90802 0.74587 0.7783


(number/m3)

Density ±SE

(number/m3)

Density ±SE

(number/m3)

Density ±SE

(number/m3)

CL

AD

OC

ER

A

Bosmina longirostris 6103101 32.9 ± 32.9 70.5 ± 49.8 — 164.5 ± 116.3

Chydorus sphaericus 6107101 — 35.2 ± 35.2 — —

Daphnia galeata mendotae 6102111 1618.3 ± 230.7 2493 ± 296.4 471.9 ± 142.3 1973.5 ± 402.8

Daphnia pulicaria * 6102116 1537.4 ± 224.9 1385 ± 220.9 429 ± 135.7 82.2 ± 82.2

Daphnia rosea * 6102114 890.1 ± 171.1 738.7 ± 161.3 42.9 ± 42.9 164.5 ± 116.3



Leptodora kindti * 6108101 — 17.6 ± 17.6 — —

Total cladocerans 4078.6 ± 366.3 4740 ± 408 943.9 ± 201.2 2384.7 ± 442.8

CO

PE

PO

DA

Copepod nauplii 6170090 7269.2 ± 489 11171.6 ± 627.5 9610.2 ± 642.1 14883.7 ±1106.3

Cyclops bicuspidatus th. 6128101 1085.4 ± 189 1409.7 ± 222.9 1544.5 ± 257.4 2384.7 ± 442.8

Cyclopoid copepodites 6128000 855.2 ± 167.7 1127.7 ± 199.4 858.1 ± 191.9 3371.4 ± 526.5


Diaptomus reighardi 6183184 263.1 ± 93 1656.4 ± 241.6 3346.4 ± 378.9 6989.6 ± 758.1




Total copepods 10229.4 ± 580.1 16493 ± 762.4 18062 ± 880.3 30178.5 ±1575.3

RO

TIF

ER

A &

PR

OT

ISTA


Ascomorpha ovalis 4508023 328.9 ± 104 2819.3 ± 445.8 3518 ± 549.4 2631.4 ± 657.8

Asplanchna priodonta 4512011 164.5 ± 73.5 — — —


Collotheca pelagica 4519011 65.8 ± 46.5 141 ± 99.7 343.2 ± 171.6 328.9 ± 232.6


Difflugia sp. 1000100 32.9 ± 32.9 — — —

Filinia terminalis 4515011 98.7 ± 57 775.3 ± 233.8 429 ± 191.9 1151.2 ± 435.1

Gastropus stylifer 4508011 — 70.5 ± 70.5 — —

Keratella cochlearis 4501013 2401.1 ± 281 4933.8 ± 589.7 1029.7 ± 297.2 2466.9 ± 637

Keratella hiemalis 4501011 — 141 ± 99.7 85.8 ± 85.8 —


Kellicottia longispina 4501051 1973.5 ± 254.8 17620.8 ±1114.4 21279.8 ±1351.3 75816.3 ±3531.1

Lecane sp. 4502010 — — — —


Philodina sp. 4520020 — — — —


Polyarthra vulgaris 4513011 296 ± 98.7 1057.2 ± 273 3174.8 ± 521.9 4604.9 ± 870.2

Polyarthra major 4513015 98.7 ± 57 775.3 ± 233.8 3603.8 ± 556.1 5756.1 ± 973


Synchaeta oblonga 4513021 394.7 ± 113.9 1550.6 ± 330.6 1458.7 ± 353.8 1315.7 ± 465.2

Trichocerca multicrinis 4507017 — — — —


Total rotifers and protozoans 5854.8 ± 438.8 29884.8 ±1451.3 34922.8 ±1731.1 94071.4 ±3933.3


Fish larvae 8717090 — — — —

TOTA

L Z

OO

PLA

NKTO

N Total Density 20162.9 ± 814.4 51117.8 ±1595.1 53928.7 ±1849.7 126634.5 ±4070.2


% Edible Zooplankton 17 10.1 2.5 0.8

Biovolume Measured (in mls): 6 7 5 5.5



HAGG LAKE MONITORING 2003 — ZOOPLANKTON DENSITY (CONTINUED) SHEET 4 OF 4)

Zooplankton 22-Sep-03 6-Oct-03 20-Oct-03 8-Dec-03Time Sampled 10:42 11:25 11:30 12:20

Depth Sampled (meters) 22 21.3 17 20

Volume (m3) 0.71344 0.69074 0.5513 0.64859


(number/m3)

Density ±SE

(number/m3)

Density ±SE

(number/m3)

Density ±SE

(number/m3)

CL

AD

OC

ER

A

Bosmina longirostris 6103101 — 185.3 ± 92.7 116.1 ± 82.1 1003.2 ± 128.4

Chydorus sphaericus 6107101 — — 1.8 ± 1.8 16.4 ± 16.4

Daphnia galeata mendotae 6102111 2795.2 ± 354.1 5022.8 ± 482.4 580.4 ± 183.6 —

Daphnia pulicaria * 6102116 136.4 ± 78.2 — — —

Daphnia rosea * 6102114 477.2 ± 146.3 1416.7 ± 256.2 232.2 ± 116.1 49.3 ± 28.5



Leptodora kindti * 6108101 — — 3.6 ± 2.6 —

Total cladocerans 3408.8 ± 391 6624.7 ± 554 934.2 ± 214.3 1069 ± 132.6

CO

PE

PO

DA

Copepod nauplii 6170090 8252.9 ± 608.4 2825.9 ± 361.8 20141.6 ±1081.3 5690.3 ± 305.9

Cyclops bicuspidatus th. 6128101 2063.2 ± 304.2 3567.2 ± 406.5 2031.6 ± 343.4 723.6 ± 109.1

Cyclopoid copepodites 6128000 2556.6 ± 338.6 2825.9 ± 361.8 2031.6 ± 343.4 1217 ± 141.5


Diaptomus reighardi 6183184 3184.6 ± 377.9 2316.3 ± 327.6 — 16.4 ± 16.4

Epischura nevadensis * 6182031 — — 1.8 ± 1.8 —



Total copepods 17088.9 ± 875.5 12091.3 ± 748.4 24322.6 ±1186.8 7779 ± 357.7

RO

TIF

ER

A &

PR

OT

ISTA


Ascomorpha ovalis 4508023 1704.4 ± 391 4725.3 ± 467.9 812.6 ± 217.2 131.6 ± 46.5

Asplanchna priodonta 4512011 — — — 16.4 ± 16.4


Collotheca pelagica 4519011 269.1 ± 155.4 92.7 ± 65.5 58 ± 58 16.4 ± 16.4


Difflugia sp. 1000100 — — 116.1 ± 82.1 131.6 ± 46.5

Filinia terminalis 4515011 627.9 ± 237.3 — 232.2 ± 116.1 444 ± 85.5

Gastropus stylifer 4508011 — — — —

Keratella cochlearis 4501013 627.9 ± 237.3 92.7 ± 65.5 406.3 ± 153.6 1924.2 ± 177.9

Keratella hiemalis 4501011 89.7 ± 89.7 — — 16.4 ± 16.4


Kellicottia longispina 4501051 38394 ±1855.8 4864.3 ± 474.7 406.3 ± 153.6 1019.7 ± 129.5

Lecane sp. 4502010 — — — —


Philodina sp. 4520020 — — — —

Ploesoma truncatum 4512031 — — — 16.4 ± 16.4

Polyarthra vulgaris 4513011 2422.1 ± 466.1 694.9 ± 179.4 2437.9 ± 376.2 888.1 ± 120.9

Polyarthra major 4513015 1973.5 ± 420.8 509.6 ± 153.6 1567.2 ± 301.6 2105.1 ± 186.1


Synchaeta oblonga 4513021 269.1 ± 155.4 92.7 ± 65.5 58 ± 58 394.7 ± 80.6

Trichocerca multicrinis 4507017 89.7 ± 89.7 92.7 ± 65.5 116.1 ± 82.1 —

Trichocerca similis 4507022 — 46.3 ± 46.3 — —

Total rotifers and protozoans 46467.5 ±2041.7 11211.1 ± 720.7 6210.8 ± 600.4 7104.7 ± 341.8


Fish larvae 8717090 — — — —

TOTA

L Z

OO

PLA

NKTO

N Total Density 66965.3 ±2144.6 29927.2 ±1177.5 31467.6 ±1346.7 15952.7 ± 512.2


% Edible Zooplankton 3 7.6 0.9 0.6

Biovolume Measured (in mls): 7 4.5 1 0.5



DISTRIBUTION OF ZOOPLANKTON LENGTHS

Statistic[based on n=50]

Organism Length (millimeters)

Daphnia spp.Cyclops bicuspidatus

thomasiDiaptomus reighardi

Bosmina longirostris

April 4, 2003

Minimum 0.700 0.425 0.675 —

Maximum 2.175 1.325 1.300 —

Median 1.425 0.888 1.050 —

Mean 1.368 0.873 1.001 —

Standard deviation 0.287 0.252 0.148 —

May 20, 2003

Minimum 0.675 0.425 0.400 —

Maximum 2.050 1.225 1.250 —

Median 1.163 0.938 0.875 —

Mean 1.233 0.941 0.834 —


June 23, 2003

Minimum 0.625 0.375 0.500 —

Maximum 2.000 1.300 1.200 —

Median 1.150 0.938 0.788 —

Mean 1.129 0.918 0.808 —


July 29, 2003

Minimum 0.650 0.600 0.525 —

Maximum 1.950 1.350 1.150 —

Median 1.425 1.013 0.950 —

Mean 1.323 1.000 0.919 —


September 22, 2003

Minimum 0.675 0.425 0.350 —

Maximum 1.650 1.275 1.175 —

Median 1.000 0.863 0.975 —

Mean 1.103 0.835 0.958 —


October 20, 2003

Minimum 0.775 0.425 0.350 —

Maximum 1.550 1.200 1.400 —

Median 1.138 1.000 0.700 —

Mean 1.136 0.880 0.752 —



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HAGG LAKE TRIBUTARY MONITORING 2003 — BACTERIOLOGICAL DATA

Date Time LocationSample Depth

(m)E. coli /100 ml

(MPN)Total Coliform/100 ml

(MPN)

01/29/03 11:30 Sain Ck (RM 1.6) 0.0 16 649

01/29/03 10:50 Scoggins Ck (RM 8.0) 0.0 6 687

01/29/03 10:25 Tanner Ck (RM 1.6) 0.0 63 1553

01/29/03 12:00 Scoggins Ck (RM 4.8) 0.0 48 1986

02/18/03 11:00 Sain Ck (RM 1.6) 0.0 5 727

02/18/03 10:50 Scoggins Ck (RM 8.0) 0.0 1 770

02/18/03 10:30 Tanner Ck (RM 1.6) 0.0 26 1414

02/18/03 11:25 Scoggins Ck (RM 4.8) 0.0 14 >2419

03/18/03 10:40 Sain Ck (RM 1.6) 0.0 5 231

03/18/03 9:40 Scoggins Ck (RM 8.0) 0.0 1 308

03/18/03 9:15 Tanner Ck (RM 1.6) 0.0 13 361

03/18/03 11:10 Scoggins Ck (RM 4.8) 0.0 <1 248

04/15/03 10:50 Sain Ck (RM 1.6) 0.0 2 291

04/15/03 10:30 Scoggins Ck (RM 8.0) 0.0 <1 225

04/15/03 10:15 Tanner Ck (RM 1.6) 0.0 10 461

04/15/03 11:20 Scoggins Ck (RM 4.8) 0.0 13 345

05/13/03 12:15 Sain Ck (RM 1.6) 0.0 5 166

05/13/03 12:00 Scoggins Ck (RM 8.0) 0.0 21 548

05/13/03 11:40 Tanner Ck (RM 1.6) 0.0 10 602

05/13/03 12:40 Scoggins Ck (RM 4.8) 0.0 22 228

06/04/03 11:21 Sain Ck (RM 1.6) 0.0 15 281

06/04/03 11:00 Scoggins Ck (RM 8.0) 0.0 29 331

06/04/03 10:40 Tanner Ck (RM 1.6) 0.0 19 572

06/04/03 11:47 Scoggins Ck (RM 4.8) 0.0 38 727

07/14/03 12:30 Sain Ck (RM 1.6) 0.0 61 687

07/14/03 12:15 Scoggins Ck (RM 8.0) 0.0 82 687

07/14/03 12:00 Tanner Ck (RM 1.6) 0.0 45 770

07/14/03 13:00 Scoggins Ck (RM 4.8) 0.0 6 579

08/11/03 12:30 Sain Ck (RM 1.6) 0.0 261 2419

08/11/03 12:08 Scoggins Ck (RM 8.0) 0.0 15 1723

08/11/03 11:50 Tanner Ck (RM 1.6) 0.0 44 1046

08/11/03 12:50 Scoggins Ck (RM 4.8) 0.0 15 1046

09/22/03 11:50 Sain Ck (RM 1.6) 0.0 129 1300

09/22/03 11:30 Scoggins Ck (RM 8.0) 0.0 770 1414

09/22/03 11:18 Tanner Ck (RM 1.6) 0.0 122 1986

09/22/03 12:15 Scoggins Ck (RM 4.8) 0.0 53 866

10/13/03 11:06 Sain Ck (RM 1.6) 0.0 38 1120

10/13/03 10:49 Scoggins Ck (RM 8.0) 0.0 21 1414

10/13/03 10:19 Tanner Ck (RM 1.6) 0.0 56 2419

10/13/03 11:34 Scoggins Ck (RM 4.8) 0.0 186 1414

11/17/03 9:55 Sain Ck (RM 1.6) 0.0 36 >2419

11/17/03 9:31 Scoggins Ck (RM 8.0) 0.0 51 2419

11/17/03 9:13 Tanner Ck (RM 1.6) 0.0 37 >2419

11/17/03 10:17 Scoggins Ck (RM 4.8) 0.0 60 2419

12/15/03 11:34 Sain Ck (RM 1.6) 0.0 8 103

12/15/03 11:13 Scoggins Ck (RM 8.0) 0.0 3 387

12/15/03 10:52 Tanner Ck (RM 1.6) 0.0 18 866

12/15/03 11:58 Scoggins Ck (RM 4.8) 0.0 123 >2419


HAGG LAKE MONITORING 2003 — BENTHIC INVERTEBRATE INDEX OF BIOLOGICAL INTEGRITY[Metric code: a ‘ +’ indicates a direct relation between metric value and biological integrity; a ‘–’ indicates an inverse relation between metric value and biological integrity. Condition categories: L= low, M=medium, H=high. Sample collected 11/13/03.]

MetricSain Creek Scoggins Ck Tanner Ck

Value Score Value Score Value Score

+ Total number of taxa 41 5 33 3 36 3

+ Number of Ephemeroptera taxa 11 5 9 5 7 3

+ Number of Plecoptera taxa 9 5 6 3 8 5

+ Number of Tricoptera taxa 5 3 3 1 5 3

+ Number of long-lived taxa 3 3 3 3 2 3

+ Number of intolerant taxa 1 1 1 1 1 1

– Percent tolerant taxa 32.4 3 29.6 3 38.4 3

+ Percent predator 2.4 1 1.12 1 2.34 1

+ Number of clinger taxa 29 5 23 5 23 5

– Percent Dominance (3 taxa) 52.8 3 79.12 1 78.26 1

BIBI TOTAL SCORE 34 26 28

BIOLOGICAL CONDITION CATEGORY M M M

Categories based on comparison with unimpacted Puget Lowland and Willamette Valley streams. Scores indicate: 1-low, 3-moderate, 3-high. Maximum IBI score=50. BIBI scores: 0–24=L, 25–39=M, >40=H. Based on average/summation of 3 replicates, not on each individual replicate. Riffle habitat. D-Frame net; 5 point composite sample; total 2 m2; 500 micron mesh; 500+ organism subsample minimum. Based on single composite sample.

HAGG LAKE MONITORING 2003 — BENTHIC COMMUNITY INDICATORS OF BIOLOGICAL CONDITION[Metric code: a ‘ +’ indicates a direct relation between metric value and biological integrity; a ‘–’ indicates an inverse relation between metric value and biological integrity. Condition: L= low, M=medium, H=high. Sample collected 11/13/03.]

MetricSain Creek Scoggins Ck Tanner Ck

Value Condition Value Condition Value Condition

+ Total abundance (number/m2) 2192 H 5316 H 3840 H

+ EPT taxa richness 25 M 18 L 20 L

+ Predator richness 8 L 5 L 10 M

+ Scraper richness 13 M 10 M 8 L

+ Shredder richness 6 M 5 M 4 L

+ Percent intolerant taxa 0.16 L 0.11 L 0.13 L

– Community tolerance 4.77 L 5.53 L 5.54 L

– Percent collector 69.7 L 84.7 L 83.07 L

– Percent Parasite 0.32 H 0 H 0.39 H

– Percent Oligochaeta 0.81 H 0.45 H 0.26 H

– Number of tolerant taxa 2 M 2 M 4 M

– Percent Simuliidae 10.8 L 45.8 L 37.1 L

– Percent Chironomidae 14.7 M 7.8 H 6.25 H

Condition based on comparisons with a Pacific Northwest montane stream with high biological integrity.


HAGG LAKE MONITORING 2003 — BENTHIC INVERTEBRATE DENSITY (SHEET 1 OF 2)[Sample collected November 13, 2003]

TAXON

SAIN CK (RM 1.6) SCOGGINS CK (RM 8.0) TANNER CK (RM 1.6)

Abundance(number/m2)

Percent of Total


Percent of Total


Percent of Total

NO

N-I

NS

EC

TS Acari 7 0.32 — — 5 0.13

Nematoda — — — — 10 0.26

Oligochaeta 18 0.81 24 0.45 10 0.26

TOTAL NON-INSECTS 25 1.13 24 0.45 25 0.65

EP

HE

ME

RO

PT

ER

A

Acentrella turbida — — 6 0.11 — —

Ameletus 4 0.16 — — — —

Attenella delantala — — 6 0.11 — —

Baetidae — — — — 10 0.26

Baetis tricaudatus 671 30.60 1542 29.01 1405 36.59

Cinygmula 127 5.80 84 1.58 85 2.21

Diphetor hageni 21 0.97 24 0.45 30 0.78

Drunella coloradensis/flavilinea 67 3.06 — — 5 0.13

Epeorus 148 6.76 120 2.26 5 0.13

Epeorus grandis 4 0.16 — — — —

Ephemerella inermis/infrequens 74 3.38 90 1.69 — —

Ironodes 4 0.16 — — — —

Paraleptophlebia 74 3.38 36 0.68 160 4.17

Rhithrogena 49 2.25 228 4.29 — —

TOTAL EPHEMEROPTERA 1243 56.68 2136 40.18 1700 44.27

PL

EC

OP

TE

RA

Calineuria californica 7 0.32 — — 5 0.13

Capniidae 18 0.81 36 0.68 95 2.47

Chloroperlidae — — — — 5 0.13

Doroneuria — — 6 0.11 — —

Hesperoperla pacifica 4 0.16 — — 5 0.13

Isoperla 11 0.48 — — — —

Paraperla — — — — 5 0.13

Perlodidae — — — — 25 0.65

Pteronarcys 4 0.16 6 0.11 — —

Skwala 4 0.16 — —

Sweltsa 4 0.16 24 0.45 5 0.13

Zapada cinctipes 49 2.25 54 1.02 15 0.39

Zapada Oregonensis Group 7 0.32 12 0.23 — —

TOTAL PLECOPTERA 106 4.83 138 2.60 160 4.17

TR

ICH

OP

TE

RA

Arctopsyche grandis — — 6 0.11 — —

Glossosoma 25 1.13 — — 10 0.26

Hydropsyche 78 3.54 30 0.56 5 0.13

Lepidostoma-panel case larvae 7 0.32 — — — —

Onocosmoecus unicolor — — — — 5 0.13

Rhyacophila Betteni Group 18 0.81 18 0.34 10 0.26

Rhyacophila pellisa/valuma 4 0.16 — — 5 0.13

TOTAL TRICHOPTERA 131 5.96 54 1.02 35 0.91


CO

LEO

PTER

A Heterlimnius 78 3.54 36 0.68 175 4.56

Optioservus 39 1.77 30 0.56 50 1.30

TOTAL COLEOPTERA 116 5.31 66 1.24 225 5.86

DIP

TE

RA

Antocha 14 0.64 42 0.79 — —

Chelifera/Metachela — — 6 0.11 5 0.13

Dicranota — — — — 20 0.52

Dixa — — — — 5 0.13

Simuliidae — — 2436 45.82 1425 37.11

Simulium 237 10.79 — — — —

TOTAL DIPTERA 251 11.43 2484 46.73 1455 37.89

CH

IRO

NO

MID

AE

Brillia 14 0.64 36 0.68 5 0.13

Chironomidae-pupae 28 1.29 90 1.69 45 1.17

Eukiefferiella — — 6 0.11 55 1.43

Eukiefferiella Devonica Group — — 6 0.11 — —

Micropsectra 4 0.16 6 0.11 — —

Nanocladius 4 0.16 — — 10 0.26

Orthocladius Complex 4 0.16 24 0.45 — —

Parakiefferiella — — — — 5 0.13

Parametriocnemus 7 0.32 — — 15 0.39

Rheocricotopus 4 0.16 6 0.11 — —

Thienemanniella 4 0.16 — — — —

Thienemannimyia Complex 4 0.16 — — — —

Tvetenia Bavarica Group 251 11.43 168 3.16 105 2.73

TOTAL CHIRONOMIDAE 321 14.65 414 7.79 240 6.25

TOTAL BENTHIC INVERTEBRATES 2192 100.00 5316 100.00 3840 100.00

HAGG LAKE MONITORING 2003 — BENTHIC INVERTEBRATE DENSITY (CONTINUED) (SHEET 2 OF 2)[Sample collected November 13, 2003]

TAXON

SAIN CK (RM 1.6) SCOGGINS CK (RM 8.0) TANNER CK (RM 1.6)


Percent of Total


Percent of Total


Percent of Total


HAGG LAKE MONITORING 2003 — WEATHER OBSERVATIONS

Date Time LocationAir Temp

(ºC)Barometer

(mm Hg)

Wind(Beaufort

Scale)

Wind Direction

% Cloud Cover

Comments

01/28/2003 10:30 Hagg Lake 7 768 0 80 Fog, rising

01/29/2003 11:20 Sain Ck (RM 1.6) 9 765 0 100 Heavy Rain

01/29/2003 10:45 Scoggins Ck (RM 8.0) 9 765 0 100 Heavy Rain

01/29/2003 10:10 Tanner Ck (RM 1.6) 8 765 0 100 Rain

01/29/2003 12:00 Scoggins Ck (RM 4.8) 8 765 0 100 Heavy Rain

02/04/2003 9:30 Hagg Lake 2 772 0 100 Ground Fog

02/18/2003 11:00 Sain Ck (RM 1.6) 8 767 0 100

02/18/2003 10:50 Scoggins Ck (RM 8.0) 7 767 0 100

02/18/2003 10:30 Tanner Ck (RM 1.6) 7 767 0 100 Sprinkles

02/18/2003 11:25 Scoggins Ck (RM 4.8) 9 767 0 100

03/11/2003 10:00 Hagg Lake 9 760 0 100

03/18/2003 10:30 Sain Ck (RM 1.6) 8 769 0 100 Rain

03/18/2003 9:30 Scoggins Ck (RM 8.0) 7 769 0 100

03/18/2003 9:00 Tanner Ck (RM 1.6) 7 769 0 100 Light Rain

03/18/2003 11:00 Scoggins Ck (RM 4.8) 8 769 0 100 Rain

03/25/2003 10:00 Hagg Lake 9 765 2 SW 100 Rain

04/15/2003 10:50 Sain Ck (RM 1.6) 12 762 0 60

04/15/2003 10:30 Scoggins Ck (RM 8.0) 11 762 0 60

04/15/2003 9:57 Tanner Ck (RM 1.6) 11 762 0 90

04/15/2003 11:20 Scoggins Ck (RM 4.8) 12 762 0 75

04/22/2003 9:42 Hagg Lake 11 761 1 W 20 Nice

05/13/2003 9:34 Hagg Lake 12 763 1 NE 30 Nice

05/13/2003 12:15 Sain Ck (RM 1.6) 15 763 0 10 Nice

05/13/2003 12:00 Scoggins Ck (RM 8.0) 15 763 0 10 Nice

05/13/2003 11:40 Tanner Ck (RM 1.6) 15 763 0 10 Nice

05/13/2003 12:40 Scoggins Ck (RM 4.8) 16 763 0 10 X-Nice

05/20/2003 9:40 Hagg Lake 12 767 1 W 100

06/04/2003 8:40 Hagg Lake 16 765 1 SW 0 Beautiful

06/23/2003 10:16 Hagg Lake 12 763 1 SW 100

07/14/2003 9:51 Hagg Lake 26 767 1 SE 10

07/14/2003 12:30 Sain Ck (RM 1.6) 27 767 0 0

07/14/2003 12:15 Scoggins Ck (RM 8.0) 28 767 0 5

07/14/2003 12:00 Tanner Ck (RM 1.6) 28 767 0 5

07/14/2003 13:00 Scoggins Ck (RM 4.8) 27 767 0 0

07/29/2003 9:46 Hagg Lake 28 762 0 0 Hot

08/11/2003 9:45 Hagg Lake 765 1 SE 25

08/25/2003 10:25 Hagg Lake 24 763 0 0

09/22/2003 9:30 Hagg Lake 20 763 2 NW 0

10/06/2003 10:07 Hagg Lake 14 762 1 SE 100 Low Clouds, Fog

10/13/2003 10:19 Tanner Ck (RM 1.6) 11 766 1 SW 10 Partly Cloudy

10/20/2003 10:15 Hagg Lake 18 759 4 SE 100 Gusty Winds

11/03/2003 9:00 Tanner Ck (RM 1.6) -2 765 1 0 Cold, Blue Skies

11/17/2003 9:00 Tanner Ck (RM 1.6) 7 762 1 NW 95 Mostly Cloudy

12/08/2003 10:11 Hagg Lake 5 767 0 90 Drizzle

12/15/2003 11:19 Scoggins Ck (RM 8.0) 6 770 0 100 High Overcast

AAAAppppppppeeeennnnddddiiiixxxx HHHH

MMMMoooonnnntttthhhhllllyyyy PPPPrrrreeeecccciiiippppiiiittttaaaattttiiiioooonnnn

APPENDIX H—Monthly PrecipitationH-2 2003 Tualatin River Flow Management Report

PRECIPITATION AT SCOGGINS DAM

YearMay

(inches)June

(inches)July

(inches)August(inches)

September(inches)

October(inches)

November(inches)

May-Oct Total

(inches)

1990 — 2.02 0.26 1.18 0.00 2.62 4.49 >6.08

1991 2.29 1.42 0.22 0.54 0.23 1.80 — >6.50

1992 0.09 0.71 0.42 0.35 1.47 2.84 5.94 5.88

1993 3.95 2.26 2.59 0.17 0.02 1.21 1.92 10.20

1994 0.96 1.30 0.00 0.13 0.98 4.94 9.30 8.31

1995 1.47 2.44 0.58 1.01 1.89 3.70 12.24 11.09

1996 4.49 1.59 0.58 0.34 2.32 5.44 8.73 14.76

1997 2.68 3.34 0.29 1.28 4.52 8.57 4.41 20.68

1998 4.56 0.96 0.24 0.00 0.91 4.51 15.20 11.18

1999 2.15 0.93 0.08 0.96 0.06 3.13 12.68 7.31

2000 2.94 2.26 0.03 0.19 0.81 3.24 3.08 9.47

2001 2.20 1.79 0.23 0.78 0.53 3.28 12.10 8.81

2002 1.58 1.46 0.13 0.19 0.57 0.73 4.37 4.66

2003 0.86 0.20 0.01 0.62 0.86 3.34 5.26 5.89

Minimum 0.09 0.20 0.00 0.00 0.00 0.73 1.92 4.66

Maximum 4.56 3.34 2.59 1.28 4.52 8.57 15.20 20.68

Mean 2.32 1.62 0.40 0.55 1.08 3.53 7.67 9.34

APPENDIX H—Monthly Precipitation2003 Tualatin River Flow Management Report H-3

May June July August September October November

Pre

cip

tiat

ion

(in

ches

)

0.0

16.0

14.0

12.0

10.0

8.0

6.0

4.0

2.0

Range of values 1990–2003

Mean of values 1990–2003

2003 value

Monthly Precipitation Comparison

0.0

22.0

20.0

18.0

16.0

8.0

6.0

4.0

2.0

14.0

12.0

10.0

Annual ‘Dry Season’ Precipitation Comparison

May

– O

cto

ber

To

tal P

reci

pti

atio

n (

inch

es)

1990 1991 1992 1993 1996 1999 2001200019981994 19971995 2002 2003

AAAAppppppppeeeennnnddddiiiixxxx IIII

RRRRiiiivvvveeeerrrr MMMMiiiilllleeee IIIInnnnddddiiiicccceeeessss

APPENDIX I—River Mile IndicesI-2 2003 Tualatin River Flow Management Report

STREAMS INDEXED

Fanno Creek

Cr

Cr

Cr

S. Rock

McF

ee C

r

Christensen

Creek

Creek

Rock

Gales

Creek

SCHO

Scog

Barney Reservoir

Scoggins Reservoir

Lake Oswego

WI L L A M

E T T E RI V

ER

TU

AL

R

Streams that are Indexed

Withdrawal Points


Dairy

Creek

Burris Cr

He Cr

Baker CrChicken

Cedar Cr

Canal

(Hagg Lake)

Ash C

r

Hedges Cr

Sain Cr

Ta

gins

Car

pe

Dawson Cr

Beave

rton

Creek

nner Cr

nter

Cr

onat

Lake Oswego

AT

IN

VE

RI

Coun

sil

Cr

S. Johns on Cr

Saum Cr

Springbrook Cr

Butternut Cr

CreekMcKay

East

West Fork

Fork

Brons

CedarMill Cr

on Cr

North


APPENDIX I—River Mile Indices2003 Tualatin River Flow Management Report I-3

STREAMS INDEXED

STREAM NAME HYDROLOGIC UNIT CODE PAGE

Tualatin River 211400300 I-4

Fanno Creek 2114003000180 I-7

Rock Creek 2114003000420 I-8

Beaverton Creek 2114003000420060 I-9

Dairy Creek 2114003000480 I-10

McKay Creek 2114003000480020 I-11

East Fork Dairy Creek 2114003000480080 I-12

West Fork Dairy Creek 2114003000480090 I-13

Gales Creek 2114003000560 I-14

Scoggins Creek 2114003000640 I-15


TUALATIN RIVER — RIVER MILE INDEXHUC: 211400300[Elevation measured relative to 0.00 gage datum; Abbreviations: RB= right bank, LB= left bank, HUC= Hydrologic Unit Code]

River Mile Bank DescriptionDrainage Area(square miles)

Elevation(feet)

0.00 Mouth of Tualatin River at Willamette River(LB of Willamette River @ River Mile 28.5)

712

0.20 Weiss Bridge – Petes Mtn Rd.

1.60 RB Fields Creek (HUC: 02114003000010)

1.69 State Hwy 212 Bridge (Fields Bridge)

1.75 LB West Linn Stream Gage Station – USGS #14207500 706 85.61

2.40 LB Tate Creek (HUC: 02114003000020)

3.45 Lake Oswego Corp. Diversion Dam

4.25 Interstate 205 Bridge

4.56 LB Wilson Creek (HUC: 02114003000080)

5.34 LB Boat Launch

5.36 LB Shipley Creek (HUC: 02114003000100)

5.38 Shipley Bridge– Stafford Rd.NWS Wire Weight Gage

5.62 LB Pecan Creek (HUC: 02114003000120)

6.02 RB Athey Creek (HUC: 02114003000123)

6.70 RB Saum Creek (HUC: 02114003000130)

6.70LB

Oswego Canal DiversionRiver Elevation Recording Gage #14206990, Headgate, andCanal Recording Gage #14207000

7.36 LB Boat Launch – Dogwood Drive

7.67 RB Browns Ferry Park Canoe Launch

7.83 Clackamas County – Washington County Boundary(Underground Cable Crossing Sign)

8.18 Interstate 5 Bridge

8.60 Boones Ferry Road Bridge

8.64 RB Hedges Creek (HUC: 02114003000150)

8.90 RB Tualatin Park Boat Launch

8.91RB

Southern Pacific RR BridgeTualatin River at Tualatin Elevation Recording Station #14206960

9.32 LB Fanno Creek (HUC: 02114003000180) [Index on page I-13] 26.8

9.33 LB Durham Wastewater Treatment Plant Outfall

9.34 Oregon Electric RR Bridge

9.80 LB Cook Park Boat Launch

11.50LB

US Hwy. 99W Bridge (Pacific Highway)Canoe Launch(access from southeast of bridge)

12.68 Overhead BPA Transmission Line; Vancouver–Eugene

12.80 LB Rivermeade Boat Launch (Private)

15.20 RB Rock Creek–South (HUC: 02114003000250) 13.7

15.50 RB Chicken Creek (HUC: 02114003000270)

16.09 RB Chicken Creek Drainage Ditch

16.22RB

Shamberg Bridge (Elsner Road)Rated Staff Gage for Stream Flow


21.12 Overhead BPA Transmission Line; Big Eddy–Keeler

26.90 State Hwy. 210 bridge (Scholls)

28.20 RB McFee Creek (HUC: 02114003000310)

30.76 LB Unnamed Stream (HUC: 02114003000320) (Jacktown)

31.62 RB Burris Creek (HUC: 02114003000330)

31.92 RB Christensen Creek (HUC: 02114003000350)

33.30LB

Harris Bridge (State Highway 208)Farmington Recording Stream Gage #14206500

568 100.42

35.68 LB Butternut Creek (HUC: 02114003000380)

37.38 LB Gordon Creek (HUC: 02114003000400)

38.08 LB Rock Creek Wastewater Treatment Plant Outfall

38.09 LB Rock Creek (HUC: 02114003000420Beaverton Creek (HUC:02114003000420060)

74.636

38.44 LB

LB

Rood Bridge Small Watercraft LaunchRood Bridge Road BridgeRecording Stream Gage #14206295 105.16

40.44 RB Davis Creek (HUC: 02114003000430)

41.64 Minter Bridge Road Bridge

43.88 LB

LB

Jackson SloughJackson Bottom WetlandsHillsboro Wastewater Treatment Plant Effluent Outfall

44.40RB

State Highway 219 BridgeRated Staff Gage for Stream Flow

44.73 LB Dairy Creek (HUC: 02114003000480) [Index on page I-9]McKay Creek (LB) (HUC: 02114003000480020) [Index on page I-10]East Fork Dairy Creek (HUC: 02114003000480080) [Index on page I-11]West Fork Dairy Creek (HUC: 02114003000480090) [Index on page I-12]

22663.4

51.54RB

Golf Course Road BridgeGolf Course Recording Stream Gage #14204800

53.74 LaFollett Road (Bridge removed)

55.24 LB Forest Grove Wastewater Treatment Plant OutfallFern Hill Wetlands

55.32 Fernhill Road Bridge

56.10 Springhill Pump Plant Intake

56.80 LB Gales Creek (HUC: 02114003000560) [Index on page I-8] 78.6

57.38 LB Carpenter Creek (HUC: 02114003000580)

57.84 LB Dilley Creek (HUC: 02114003000600)

58.04 LB Johnson Creek (HUC: 02114003000602)

58.82LB

Springhill Road BridgeTualatin River at Dilley Stream Gage; USGS #14203500

125 147.57

59.02 LB O'Neil Creek (HUC: 02114003000620)

60.00 LB Scoggins Creek (HUC: 02114003000640) [Index on page I-7]

60.80 RB Wapato Creek (HUC: –02114003000670)Wapato Creek Improvement District Return Flow

62.00 RB Wapato Improvement District Headgate)

62.24 Southern Pacific RR Bridge



Elevation(feet)


62.25 State Highway 47 Bridge (Gaston)New Tualatin River at Gaston Recording Stream Gage #14202510

62.30 Bates Road Bridge

62.80 LB Black Jack Creek (HUC: 02114003000700)

62.90 Overhead BPA Transmission Line; Forest Grove–McMinnville

63.13 TVID Patten Valley Pump Station Outfall #1

63.87 RB Discontinued Tualatin River at Gaston Recording Stream Gage 48.5

64.26 TVID Patten Valley Pump Station Outfall #2

65.34 RB Williams Canyon (HUC: 02114003000730)

65.90 Mt. Richmond Road Bridge

67.30 LB Hering Creek (HUC: 02114003000760)

67.83 South Road Bridge (Cherry Grove)

68.44 RB Roaring Creek (HUC: 02114003000790)

69.42 Little Lee Falls

70.70LB

Raines Bridge– Tualatin River below Lee FallsRated Staff Gage for Stream Flow

71.07 Lee Falls

73.28 Haines Falls

73.30 LB City of Hillsboro Haines Falls Intake

74.00 LB Lee Creek (LB–02114003000860)

74.05 RB Patten Creek (HUC: 02114003000870)

75.70 LB Sunday Creek (HUC: 02114003000900)

76.60 LB Maple Creek (HUC: –02114003000940)

76.95 Ki–A–Cut Falls

78.00 RB Barney Reservoir Aqueduct Outfall

79.3+ Headwaters of Tualatin River



Elevation(feet)


FANNO CREEK — STREAM MILE INDEXHUC: 2114003000180[Abbreviations: RB= right bank, LB= left bank, HUC= Hydrologic Unit Code, ISWR= Instream Water Right]

River Mile Bank Description

0.00 Confluence with the Tualatin River (HUC: 02114003000) at River Mile 9.32


1.19 Durham Road BridgeUSGS Gage #14206950

2.00 LB Ball Creek (HUC: 02114003000180020)

2.12 Bonita Street Bridge – Rated Staff Gage

3.28 SW Hall Blvd Bridge

3.95 SW Ash Avenue Bridge

4.28 SW Main St Bridge

4.30 State Hwy 99W Bridge

4.49 SW Grant Ave Bridge

5.07 SW Tiederman Ave. Bridge

5.08 RB Summer Creek (HUC: 02114003000180070)Rated Staff Gage at Fowler School

5.32 SW Tigard Ave Bridge

5.53 SW North Dakota St Bridge

5.54 LB Ash Creek (HUC: 02114003000180080)Rated Staff Gage at Greenburg Road

6.38 Scholls Ferry Road Bridge

7.30 Tuckerwood – Rated Staff Gage

7.66 SW Hall Blvd Bridge

8.40 SW Denny Rd Bridge


8.70 State Hwy 217 Bridge

9.42 Scholls Ferry Road BridgeRated Staff Gage

9.66 SW 92nd Ave Bridge

9.90 SW Bohmann Parkway Bridge

10.16 SW 86th Ave Bridge

10.78 SW Nicol Road Bridge

11.76 Olson Road Bridge

11.96 RB Sylvan Creek (HUC: 02114003000180190)

11.98 SW Beaverton–Hillsdale Hwy (State Hwy 10)

12.10 Washington County – Multnomah County Line

12.58 SW 56th Ave BridgeUSGS Gage #14206900

12.81 SW Shattuck Road Bridge


13.23 RB Ivey Creek (HUC: 02114003000180250)

13.32 SW 43rd Ave Bridge

13.38 SW 42nd Ave Bridge


13.98 SW Beaverton–Hillsdale Hwy (State Hwy 10)



ROCK CREEK — STREAM MILE INDEXHUC: 2114003000420[Abbreviations: RB= right bank, LB= left bank, HUC= Hydrologic Unit Code]


0.8 River Road Bridge


1.2+ State Highway 8 Bridge – Rated Staff Gage for Stream Flow

2.4 SW Brookwood Avenue Bridge

3.1 RB Dawson Creek

4.4 LB Beaverton Creek

4.5 Baseline Road Bridge

4.9 NW Quatama Road Bridge – Rated Staff Gage for Stream Flow


5.7 NW 216th Avenue Bridge

6.7 NW Cornell Road Bridge

7.8 US Highway 26 Bridge

9.0 West Union Road Bridge – Rated Staff Gage for Stream Flow

9.3 RB Holcomb Creek

10.0 NW 185th Avenue Bridge

10.9 LB Abbey Creek

11.0 Germantown Road Bridge

11.9 Cornelius Pass Road Bridge

13.0 Old Cornelius Pass Road Bridge

14.1 Burlington Northern RR Bridge

15.1 Rated Staff Gage for Stream Flow

16.4 Rock Creek Road Bridge

16.5 Van Raden Reservoir

19.1 Headwaters


BEAVERTON CREEK — STREAM MILE INDEXHUC: 2114003000420060[Abbreviations: RB= right bank, LB= left bank, HUC= Hydrologic Unit Code]


0.00 Confluence with Rock Creek (LB, HUC: 02114003000480080260) @ River Mile 4.3

0.40 Southwest Baseline Road

1.16 Southwest 216th Avenue Road Bridge– Rated Staff Gage for Stream Flow

2.20 RB Bronson Creek (HUC: 02114003000420060010)

3.32 RB Willow Creek (HUC: 02114003000420060050)

4.90 Southwest 170th Avenue Road Bridge– Rated Staff Gage for Stream Flow

5.47 LB Unnamed Stream (HUC: 02114003000420060096)

6.06 LB Johnson Creek (HUC: 02114003000420060100)

6.30 LB Unnamed Stream (HUC: 02114003000420060120)

6.66 Oregon Electric Railroad

7.45 Cedar Hills Boulevard

7.90 RB Wessenger Creek (HUC: 02114003000420060130)

8.75+ Headwaters


DAIRY CREEK — STREAM MILE INDEXHUC: 02114003000480[Abbreviations: RB= right bank, LB= left bank, HUC= Hydrologic Unit Code]


0.00 Confluence with Tualatin River (HUC: 0211400300) @ River Mile 44.73


2.06 State Highway 8 BridgeDairy Creek at TW Hwy Recording Stream Gage #14206200


2.26 LB McKay Creek (HUC: 02114003000480020)

3.53 RB Council Creek (HUC: 02114003000480040)

6.02 Susbauer Road Bridge (County Road 196)

7.39 BPA Power Line Crossing

8.51 Cornelius–Schefflin Road Bridge (County Road 2161)Rated Staff Gage for Stream Flow

10.55 Confluence of East Fork Dairy Ck (HUC: 02114003000480080) & West Fork Dairy Ck (02114003000480090)


MC KAY CREEK — STREAM MILE INDEXHUC: 2114003000480020[Abbreviations: RB= right bank, LB= left bank, HUC= Hydrologic Unit Code]


0.00 Confluence with Dairy Creek (HUC: 02114003000480) @ River Mile 2.26

1.31 Padgett Road Bridge (County Road 2245)

2.25 Hornecker Road Bridge (County Road 2393)Rated Staff Gage for Stream Flow

2.30 Southern Pacific RR Crossing

4.32 Glencoe Road Bridge (County Road A–146½)Rated Staff Gage for Stream Flow

4.46 BPA Transmission Line Crossing

5.34 LB Waible Creek (HUC: 02114003000480020040)

6.30 NW Old Scotch Church Road Bridge (County Road A–66)

8.00 US Hwy 26 Bridge – Sunset Highway

9.36 NW West Union Road Bridge (County Road 2496)City of North Plains to West

9.38 Southern Pacific RR Crossing

10.94 LB Jackson Creek (HUC: 02114003000480020100)

12.80 NW Shadybrook Road Bridge (County Road A–110)

15.56 NW Collins Road Bridge (County Road 1889)Rated Staff Gage for Stream Flow

16.56 RB Brunswick Canyon (HUC: 02114003000480020179)

16.66 LB East Fork McKay Creek (HUC: 02114003000480020180)

24.0+ Headwaters


EAST FORK DAIRY CREEK — STREAM MILE INDEXHUC: 2114003000480080[Abbreviations: RB= right bank, LB= left bank, HUC= Hydrologic Unit Code, ISWR= Instream Water Right]


0.00 Confluence with West Fork Dairy Creek (HUC: 02114003000480090) @ River Mile 10.56 of Dairy Creek (HUC: 02114003000480)

1.24 Roy Road Bridge (County Road A–159)Rated Staff Gage for Stream Flow

2.34 Port of Tillamook Bay RR Bridge

3.04 RB Bledsoe Creek (HUC: 02114003000480080030)

3.20 Harrington Road Bridge (County Road 1989)

4.80 SP&S RR Bridge

5.56 US Highway 26 Bridges

6.91 Mountaindale Road Bridge (County Road 12)

6.97 LB Baker Creek (HUC: 02114003000480080080)

8.44 Dairy Creek Road Bridge (County Road 2067)Rated Staff Gage for Stream Flow

8.55 East Fork Dairy Creek at Mountaindale, OR – Former USGS Gage #14205500 (10/40–9/51)Drainage Area = 43.0 square miles

9.62 NW Uebel Road Bridge (County Road 304)

12.50 Murphy Lane Bridge (Private)Rated Staff Gage for Stream Flow

12.82 RB Big Canyon (HUC: 02114003000480080150)

13.00 ISWR: C–59525 5/25/66

13.95 RB Murtaugh Creek (HUC: 02114003000480080170)

14.04 LB Meadow Brook Creek (HUC: 02114003000480080180)

14.17 Meacham Road Bridge (County Road 742)

15.55 LB Plentywater Creek (HUC: 02114003000480080200)ISWR: C–59527 5/25/66

16.52 RB Denny Creek (HUC: 02114003000480080210)ISWR: C–59526 5/25/66

16.56 Bacona Road Bridge (County Road 422 )Snooseville Corner

17.21 Greener Road Bridge (County Road 1990)

17.34 LB Rock Creek (HUC: 02114003000480080260)

17.50 Little Bend Park

17.60 Fern Flat Road Crossing (County Road 241)

18.15 LB Panther Creek (HUC: 02114003000480080280)

18.31 Fern Flat Road Crossing (County Road 241)

18.84 RB Roundy Creek (HUC: 02114003000480080290)

19.10 RB Campbell Creek (HUC: 02114003000480080310)

21.30 Washington County – Columbia County Boundary

21.48 BPA Power Line Crossing

22.0 + Headwaters


WEST FORK DAIRY CREEK — STREAM MILE INDEXHUC: 2114003000480090[Abbreviations: RB= right bank, LB= left bank, HUC= Hydrologic Unit Code]


0.00 Confluence with East Fork Dairy Creek (HUC: 02114003000480080) @ River Mile 10.56 of Dairy Creek (HUC: 02114003000480)

1.96 Evers Road Bridge (County Road A–187)Rated Staff Gage for Stream Flow

2.09 RB Lousignant Canal (HUC: 02114003000480090010)

2.82 State Highway 47 Bridge

5.28 Greenville Road Bridge (County Road A–159)


6.22 RB Cedar Canyon Creek (HUC: 02114003000480090110)

7.53 Cedar Canyon Road Bridge (County Road 1938)City of Banks to SE

7.70 State Hwy 47 Bridge – Rated Staff Gage for Stream FlowWest Fork Dairy Creek at Banks, OR –Former USGS Gage #14205000 (10/40 – 9/43)

Drainage Area = 47.5 square miles



10.60 NW Green Mountain Road Bridge (County Road 127)

11.02 LB Garrigus Creek (HUC: 02114003000480090180)

12.19 NW Turk Road Bridge (County Road 233)

12.36 RB Kuder Creek (HUC: 02114003000480090190)

12.90 NW Pihl Road Bridge (County Road 1045)Community of Manning



13.58 LB Witcher Creek (HUC: 02114003000480090200)



15.00 NW Fisher Road Bridge (County Road 394)

15.11 LB Mendenhall Creek (HUC: 02114003000480090220)

15.58 RB Burgholzer Creek (HUC: 02114003000480090230)


16.00 Community of Buxton – ½ mile east

17.02 LB Williams Creek (HUC: 02114003000480090240)

17.98 RB Cummings Creek (HUC: 02114003000480090250)



22+ Headwaters


GALES CREEK — STREAM MILE INDEXHUC: 2114003000560[Abbreviations: RB= right bank, LB= left bank, HUC= Hydrologic Unit Code, ISWR= Instream Water Right]

River Mile RB Description

0.00 Confluence with Tualatin River (HUC: 0211400300) @ River Mile 56.80ISWR: C–59523 5/25/66


1.75 Forest Grove Bypass Bridge – State Highway 47 to State Highway 8

2.36 State Highway 47 BridgeGales Creek Recording Stream Gage #14204530

3.66 Ritchey Road Bridge (County Road 461)

6.53 RB Prickett Creek (HUC: 02114003000560090)

6.98 Stringtown Road Bridge (County Road A–176)

7.70 RB Roderick Creek (HUC: 02114003000560110)

8.56 Roderick Road Bridge (County Road 395)Gales Creek near Forest Grove Oregon – Former USGS Gage #14204500 (10/40–9/56 & 10/70–9/81)

8.94 RB Godfrey Creek (HUC: 02114003000560130)

9.22 LB Kelly Creek (HUC: 02114003000560120)

10.68 RB Clear Creek (HUC: 02114003000560150)

11.44 RB Iler Creek (HUC: 02114003000560170)

11.46 NW Gales Creek Road (County Road 1312)Community of Gales Creek

11.47 RB Fir Creek (HUC: 02114003000560190)

12.00 ISWR: C–59509 5/25/66 above this point

12.36 Clapshaw Hill Road Bridge (County Road 2037)Rated Staff Gage for Stream Flow

12.40 LB Little Beaver Creek (HUC: 02114003000560200)

ISWR: C–59512 5/25/66

12.92 Parson Road Bridge

14.44 RB White Creek (HUC: 02114003000560210)

14.68 NW Wilson River Highway Bridge (State Highway 6)

15.74 RB Lyda Creek (HUC: 02114003000560230)

16.26 RB Bateman Creek (HUC: 02114003000560250)

17.50 Gales Creek near Gales Creek, OR – Former USGS Gage #1420400 (10/35–9/45 & 10/639/70)

18.00 LB Beaver Creek (HUC: 02114003000560280)Community of GlenwoodISWR: C–59524 5/25/66

18.45 NW Timber Road Bridge (County Road 374)

18.65 Wilson River Highway Bridge (State Highway 6)

19.70 Wilson River Highway Bridge (State Highway 6)

19.88 LB Coffee Creek (HUC: 02114003000560300)

20.07 LB Finger Creek (HUC: 02114003000560305)

20.70 RB South Fork Gales Creek (HUC: 02114003000560310)ISWR: C–59514 5/25/66

21.60 LB North Fork Gales Creek (HUC: 02114003000560320)ISWR: C–59513 5/25/66

22.76 RB Low Divide Creek (HUC: 02114003000560330)

Gales Creek Forest Park

23.20 Gales Creek near Glenwood, OR – USGS Gage #14203750 (7/94 – present )


SCOGGINS CREEK — STREAM MILE INDEXHUC: 2114003000640[Abbreviations: RB= right bank, LB= left bank, HUC= Hydrologic Unit Code]


0.00 Confluence with Tualatin River (HUC: 0211400300) @ River Mile 60.00

0.94 RR Bridge


1.70 Old State Highway 47 Bridge

1.71 Scoggins Creek near Gaston, OR – Former USGS Gage #14203000 (10/1940 – 9/1974)Drainage Area = 43.3 square miles

4.80 Scoggins Creek below Henry Hagg Lake, near Gaston, OR – USGS Gage #14202980 (1/1975 –present)Drainage Area = 38.8 square miles

5.10 Scoggins Dam

7.00 RB Sain Creek (HUC: 02114003000640170)

7.62 LB Tanner Creek (HUC: 02114003000640200)

8.40 LB Wall Creek (HUC: 02114003000640220)

9.00 Lake Loop Road Bridge

9.30 Scoggins Creek above Henry Hagg, near Gaston, OR – Gage #14202850 (10/1972 – present)Drainage Area = 15.9 square miles

10.52 LB Parson Creek (HUC: 02114003000640240)

15.50 LB Fisher Creek (HUC: 02114003000640300)

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