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Scientific Investigations Report 2012–5068


Reconnaissance of Contaminants in Selected Wastewater-Treatment-Plant Effluent and Stormwater Runoff Entering the Columbia River, Columbia River Basin, Washington and Oregon, 2008–10


Table 18. Physical properties and suspended-sediment results for stormwater runoff, Columbia River Basin, Washington and Oregon, 2009–10.


[Station names are shown in table 3. Abbreviations: L/min, liters per minute; mg/L, milligrams per liter; µm, micrometer; µS/cm, microSiemens per centimeter; –, not determinded at time of sampling or not analyzed; E, estimated]


Analyte Estimated

discharge from

pipe during

sampling

(L/min)
Suspended

sediment

(mg/L)
Suspended
sediment
(percent finer
than 63 µm)
pH
(standard
units)
Specific
conductance

(µS/cm)
Wenatchee 0.5 5 78 7.2 144
Richland 9 82
Umatilla 834 86
The Dalles 1.8 22 99
Hood River 1.7 2 59
Portland1 10 20 95
Vancouver1 12 61 80 7.3 E 12
Vancouver2 0.8 62 94 7.5 E 38
Portland2 12 10 88 7.6 E 36
Willamette1 12 93 7.9 140
Willamette2–Dec 3.3 47 97 6.5 131
Willamette2–May 3.3 36 98 6.8 263
Willamette3 162 95 7.1 E 98
Willamette4 2.5 42 98 7.4 112
St Helens 40 5 94 7.1 144
Longview 60 53 99 6.9 243

First posted April 25, 2012

For additional information contact:
Director, Oregon Water Science Center
U.S. Geological Survey
2130 SW 5th Avenue
Portland, Oregon 97201
http://or.water.usgs.gov

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