8 USGS Streamgages
Green River flows and levels
Green River is gauged at 8 USGS streamgages in Washington, each tracked by Rivermatics. It feeds the Duwamish Waterway. The gauged reach falls about 1,026 feet, from 1,032 feet down to 6. Rivermatics issues a daily machine-learned 14-day flow outlook at 5 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 |
|---|---|---|---|---|---|---|
| Green River below Howard A Hanson Dam, WA | WA | 221 | 1,032 | 1,152.7 | 340.7 | 14-day |
| Green River at Purification Plant near Palmer, WA | WA | 231 | 888 | 1,118.1 | 221.2 | 14-day |
| Green River below Crisp Creek near Black Diamond, WA | WA | 312 | 138 | — | — | — |
| Green River near Auburn, WA | WA | 399 | 68 | 1,615.7 | 423.8 | 14-day |
| Green River at Tukwila, WA | WA | 440 | 6 | 1,755.3 | 549.2 | — |
| Green River at 200Th Street at Kent, WA | WA | 451 | 22 | 1,608.7 | 389.3 | 14-day |
| Green River above S 277Th St at Kent, WA | WA | — | 38 | 1,203.2 | 333.8 | 14-day |
| Green River below Meeker St at Kent, WA | WA | — | 19 | — | — | — |
Common questions
- How many gauges are on the Green River?
- Rivermatics tracks 8 USGS streamgages on the Green 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.
- Is there a flow forecast for the Green River?
- Yes, at 5 of the 8 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.
- Can I use Green 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.