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Scientific Investigations Report 2007–5186

U.S. GEOLOGICAL SURVEY
Scientific Investigations Report 2007–5186

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Table 10. Mean annual discharge of total nitrogen, total phosphorus, and suspended sediment loads in the Willamette River, monitored Willamette River tributaries, and point sources discharging directly to the Willamette River, Oregon, water year 2000.

[Bold type indicates start of reach (see figure 16); shaded rows indicate monitoring site (see table 1); italicized type indicates point-source discharge source. Abbreviations: WA, Washington; OR, Oregon; ft3/s, cubic foot per second; –, not applicable]

Map index No. Site No. Site name River mile   Annual mean streamflow (ft3/s)   Total nitrogen load (pounds per day, estimated)
Willamette River Tribu-taries Point source Willamette River Tributary inflowing Willamette River Tributary inflowing Point source
OR0020559 City of Cottage Grove Wastewater Treatment Plant 187 2.87 160
OR0031224 Eugene/Springfield Water Pollution Control Facility 172 62.6 4,980
6 10376 McKenzie River at Coburg Road 172 5,070
7 10355 Willamette River at Hwy 99E (Harrisburg) (reach 1) 161 11,300 15,800
OR0033405 Fort James Operating Co. 148 5.12 38.6
OR0001074 Pope & Talbot, Inc. 147 17.6 133
8 11140 Long Tom River at Stow Pit Road (Monroe) 146 743 3,040
OR0000299 Evanite Fiber Corp. 20 1.02 33.8
OR0026361 City of Corvallis Wastewater Treatment Plant 20 16.4 602
11 10350 Willamette River at Albany (Eastbound Hwy 20 Bridge) 
(reach 2) 119 14,200 38,100
OR0028801 City of Albany Wastewater Treatment Plant 117 12.2 580
OR0000442 Weyerhaeuser Co. 116 8.06 319
OR0001112 Tdy Industries, Inc. 116 3.21 148
14 10555 Willamette River at Marion Street (Salem) (reach 3) 84 23,700 65,900
OR0026409 City of Salem Wastewater Treatment Plant 83 64.6 5,920
OR0032352 City of Newberg Wastewater Treatment Plant 4.34 346
OR0000558 SP Newsprint 10.1 76.0
17 10640 Pudding River at Hwy 211 (Woodburn) 36 825 11,700
OR0022764 Wilsonville, City of 2.99 154
OR0020214 Canby City Wastewater Treatment Plant 34 1.60 127
19 3701002 Tualatin River at Weiss Bridge 28 1,410 16,600
OR0000566 Blue Heron Paper Co. 28 4.57 58.0
OR0000787 West Linn Paper Co. 28 4.57 34.5
OR0031259 Tri-City Service District 25 12.6 994
18 13070 Clackamas River at Mciver Park (upper boat ramp) 25 2,830
OR0026891 Tryon Creek Wastewater Treatment Plant 20 12.80 1,200
OR0026221 Kellogg Creek Wastewater Treatment Plant 19 12.60 1,000
23 11321 Johnson Creek at SE 17th Avenue (Portland) 18 69 1,300
31 10611 Willamette River at Hawthorne Bridge 13 35,100 152,000
33 14211720 Willamette River at Portland, OR 13 35,100 160,000
OR0001597 Atofina Chemicals, Inc. 7 12.5 128
37 10332 Willamette River at SP&S Railroad Bridge 7 35,100 157,000
Map index No. Site No. Site name Total phosphorus load (pounds per day, estimated)   Suspended sediment load (tons per day, estimated)
Willamette River Tributary inflowing Point source Willamette River Tributary inflowing Point source
OR0020559 City of Cottage Grove Wastewater Treatment Plant 53.9
OR0031224 Eugene/Springfield Water Pollution Control Facility 1,130
6 10376 Mckenzie River at Coburg Road 1,200 88.1
7 10355 Willamette River at Hwy 99E (Harrisburg) (reach 1) 3,980 227
OR0033405 Fort James Operating Co. 28.1
OR0001074 Pope & Talbot, Inc. 60.4
8 11140 Long Tom River at Stow Pit Road 
(Monroe) 337 60.3
OR0000299 Evanite Fiber Corp. 3.51
OR0026361 City Of Corvallis Wastewater Treatment Plant 1,650
11 10350 Willamette River at Albany 
(Eastbound Hwy. 20 Bridge) 
(reach 2) 6,140 521
OR0028801 City of Albany Wastewater Treatment 
Plant 237
OR0000442 Weyerhaeuser Co. 68.2
OR0001112 Tdy Industries, Inc.
14 10555 Willamette River at Marion Street (Salem) (reach 3) 9,360 1,050
OR0026409 City of Salem Wastewater Treatment Plant 1,220
OR0032352 City of Newberg Wastewater Treatment Plant 81.6
OR0000558 Sp Newsprint 701
17 10640 Pudding River at Hwy. 211 (Woodburn) 575 27.5
OR0022764 Wilsonville, City of 31.1
OR0020214 Canby City Wastewater Treatment Plant 30.0
19 3701002 Tualatin River at Weiss Bridge 1,160
OR0000566 Blue Heron Paper Co. 27.0
OR0000787 West Linn Paper Co. 15.7
OR0031259 Tri-City Service District 236
18 13070 Clackamas River At Mciver Park (upper boat ramp) 450 264
OR0026891 Tryon Creek Wastewater Treatment Plant 143
OR0026221 Kellogg Creek Wastewater Treatment 
Plant 236
23 11321 Johnson Creek at SE 17th Avenue (Portland) 47 3.74
31 10611 Willamette River at Hawthorne Bridge 16,500 1,340
33 14211720 Willamette River at Portland, OR 16,300 2,780
OR0001597 Atofina Chemicals, Inc. 14.1
37 10332 Willamette River at SP&S Railroad Bridge 18,100 1,440

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