Rivermatics

USGS Streamgage 14211720

Willamette River at Portland, OR

Willamette River at Portland, OR is USGS streamgage 14211720 in Oregon, monitoring river discharge in hydrologic subbasin 17090012. It drains a watershed of about 11,200 square miles. Discharge records at this site go back to 1894. Typical flow runs near 9,255.8 cfs in July and 31,770 cfs in April, with the higher of the two arriving in April.

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Gauge details

State
Oregon
Drainage area
11,200 sq mi
Subbasin (HUC-8)
17090012
Coordinates
45.5175, -122.66917
USGS site number
14211720
Records begin
1894-06-07 (132 years)

Typical flow by month

Long-term daily discharge percentiles from the USGS record (up to 54 years of data), averaged within each month. These describe the historical normal range — they are not a forecast and not today's reading.

Historical monthly discharge percentiles in cubic feet per second
Month Low p10 Typical p50 High p90 Range
January 21,196.8 56,709.7 126,871
February 16,589.7 40,610.3 108,472.4
March 18,948.4 37,429 86,932.3
April 18,346.7 31,770 65,380
May 13,793.5 24,116.1 46,893.5
June 9,829.3 15,723.3 32,943.3
July 6,982.6 9,255.8 13,848.4
August 6,436.8 8,213.2 10,996.8
September 7,438.3 10,220.7 14,013.3
October 9,078.1 13,606.5 23,348.4
November 12,330 30,510 72,246.7
December 17,116.1 53,106.5 126,193.5

All values in cubic feet per second (cfs).

Other gauges in this subbasin