2 USGS Streamgages
Duwamish River flows and levels
Duwamish River is gauged at 2 USGS streamgages in Washington, each tracked by Rivermatics. It feeds the Duwamish Waterway. Drainage area at the gauges ranges from 461 square miles at Duwamish River at Golf Course at Tukwila, WA up to 483 at Duwamish River at E Marginal Way Br at Duwamish, WA.
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 |
|---|---|---|---|---|---|---|
| Duwamish River at Golf Course at Tukwila, WA | WA | 461 | 6 | — | — | — |
| Duwamish River at E Marginal Way Br at Duwamish, WA | WA | 483 | 5 | — | — | — |
Common questions
- How many gauges are on the Duwamish River?
- Rivermatics tracks 2 USGS streamgages on the Duwamish River, across Washington. 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.
- Can I use Duwamish 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.