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Scientific Investigations Report 2007–5186

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

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Table 7. Accounting for annual mean streamflow in the main stem of the Columbia River, water year 2000.

[Abbreviations: OR, Oregon; WA, Washington; ft3/s, cubic foot per second; NA, indicates an assumption was made that no flow accumulation was in the reach]

Map 
index 
No. Main-stem 
site name 
and reach Reach River mile Annual mean 
streamflow (ft3/s) Gain 
in 
reach 
(ft3/s) Sum of measured annual mean tributary inflows (ft3/s) Measured tributary inflows as percentage of 
main-stem gain
86 Northport, WA 735 106,000
1 7,800 7,020 90.0
77 Grand Coulee, WA 596 113,000
2 6,600 8,270 125
51 Vernita Bridge, WA 388 120,000
3 65,400 59,700 91.2
38 Warrendale, OR 189 185,000
4 0 0 NA
40 Upstream of Willamette 
River, OR 103 185,000
5 46,500 35,100 75.5
44 Beaver Army 
Terminal, OR 54 232,000

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