11 USGS Streamgages · Columbia River system
Willamette River flows and levels
Willamette River is gauged at 11 USGS streamgages in Oregon, each tracked by Rivermatics. The mainstem runs about 269 miles (433 km) from headwaters to outlet. It drains into the Columbia River system. It drains roughly 11,231 square miles at its outlet. Rivermatics issues a daily machine-learned 14-day flow outlook at 6 of them.
Gauges on this river, upstream to downstream
Ordered by drainage area, which is how far down the river each gauge sits. April and July figures are long-term median daily flows for that month from the USGS record — historical normals, not a forecast and not today's reading.
| Gauge | State | Drainage sq mi | Elevation ft | April p50 cfs | July p50 cfs | Forecast |
|---|---|---|---|---|---|---|
| Willamette River at Eugene, OR | OR | 2,040 | — | — | — | — |
| Willamette River at Owosso Bridge at Eugene, OR | OR | 2,050 | — | — | — | — |
| Willamette River at Harrisburg, OR | OR | 3,420 | — | 10,458.3 | 4,653.9 | 14-day + temp |
| Willamette River at Corvallis, OR | OR | 4,420 | — | 13,133.3 | 5,010.3 | 14-day + temp |
| Willamette River at Albany, OR | OR | 4,840 | — | 13,713.3 | 4,926.5 | 14-day + temp |
| Willamette River at Salem, OR | OR | 7,280 | — | 22,393.3 | 6,939 | 14-day |
| Willamette River at Newberg, OR | OR | 8,350 | — | 25,500 | 7,508.7 | 14-day + temp |
| Willamette River above Falls, at Oregon City, OR | OR | 10,000 | — | — | — | — |
| Willamette River below Falls, at Oregon City, OR | OR | 10,000 | — | — | — | — |
| Willamette River at Portland, OR | OR | 11,200 | — | 31,770 | 9,255.8 | 14-day + temp |
| Willamette River at Keizer, OR | OR | — | — | — | — | — |
Common questions
- How many gauges are on the Willamette River?
- Rivermatics tracks 11 USGS streamgages on the Willamette River, across Oregon. Each has its own page with the site's full flow record and monthly normals. The river may carry other gauges that publish neither daily values nor discharge statistics; those are not tracked here.
- Is there a flow forecast for the Willamette River?
- Yes, at 6 of the 11 gauges. Rivermatics trains a machine-learned model — a temporal-fusion transformer — on each basin's observed flows, weather and snowpack, and issues a daily outlook reaching 14 days ahead: a median estimate inside a confidence band, not a single number to bet on. Every forecast is scored against days the model never trained on, and that track record is published on each gauge's live screen.
- What river system is the Willamette River part of?
- The Willamette River drains into the Columbia River system — it is a tributary somewhere in that chain, following the flowpath down to its terminal river. Rivermatics builds this from the USGS/geoconnex reference-mainstem network rather than from names.
- Can I use Willamette River 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.
Other rivers in the Columbia River system
- Snake River 31 gauges
- Mckenzie River 9 gauges
- Big Wood River 8 gauges
- Bull Run River 6 gauges
- Cowlitz River 6 gauges
- Deschutes River 6 gauges
- Methow River 6 gauges
- North Santiam River 6 gauges