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 sits on the Willamette River, alongside 10 other gauges Rivermatics tracks on the same river. 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. Rivermatics issues a daily machine-learned flow outlook for this gauge, reaching 14 days ahead, alongside daily high and low water-temperature forecasts.

View live conditions & forecast →

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)
Rivermatics forecast
14-day flow outlook + water temperature

14-day flow forecast

Based on observations through for Willamette River at Portland, OR. Each day carries a median estimate and the band the model expects the flow to fall within — not a single number to plan against. Forecasts are re-issued daily; see the live screen for the current outlook.

Forecast daily mean discharge in cubic feet per second, by date
Date Low p10 Expected p50 High p90 Range
9,034 11,605 14,842
8,007 11,098 15,603
8,041 11,346 16,162
7,804 11,478 17,071
7,621 11,168 16,543
7,395 10,806 15,936
7,089 10,491 15,595
6,929 10,385 15,545
6,841 10,390 15,771
6,890 10,501 16,054
6,856 10,457 15,940
6,818 10,479 16,103
6,745 10,417 16,057
6,701 10,376 16,128

All values in cubic feet per second (cfs). Estimates only — do not use them for navigation or for any safety, rescue, or emergency decision.

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).

Common questions

When does Willamette River at Portland, OR normally run highest?
January, on the long-term record. The median daily flow that month is about 56,709.7 cfs, against 8,213.2 cfs in August, the lowest month. These are historical normals for the date, not a forecast and not today's reading.
What is a normal flow for Willamette River at Portland, OR?
It depends on the month. In January, half of days historically fall near 56,709.7 cfs, with the middle 80% of days between 21,196.8 and 126,871 cfs. The month-by-month table on this page gives the full range.
How long has Willamette River at Portland, OR been measured?
Discharge records at USGS site 14211720 begin in 1894, about 132 years, covering roughly 9,201 days of published daily values. The long record is what makes the monthly percentiles on this page meaningful.
Is there a flow forecast for Willamette River at Portland, OR?
Yes. Rivermatics trains a machine-learned model — a temporal-fusion transformer — on this basin's observed flows, weather, and snowpack, and issues a daily flow outlook reaching 14 days ahead: a median estimate inside a confidence band, not a single number to bet on. A companion model forecasts each day's water-temperature high and low. Every forecast is scored against days the model never trained on, and that track record is published on the live gauge screen. Open live conditions to see the current outlook.
Where is Willamette River at Portland, OR?
The gauge sits at 45.5175, -122.66917, in Oregon, in hydrologic subbasin 17090012, draining roughly 11,200 square miles.
Can I use Willamette River at Portland, OR data for flood or safety decisions?
No. Rivermatics provides estimates, not guarantees, and the readings and forecasts here may be delayed, inaccurate, or wrong. Do not use them for navigation or for any safety, rescue, or emergency decision. Check the National Weather Service and USGS directly, and use your own judgment.

Upstream and downstream on the Willamette River

Every gauge Rivermatics tracks on this river, ordered by drainage area — upstream first. See the Willamette River in full.

Other gauges in this subbasin