3 USGS Streamgages · Snohomish River system
Snoqualmie River flows and levels
Snoqualmie River is gauged at 3 USGS streamgages in Washington, each tracked by Rivermatics. The mainstem runs about 83 miles (133 km) from headwaters to outlet. It drains into the Snohomish River system. Drainage area at the gauges ranges from 375 square miles at Snoqualmie River near Snoqualmie, WA up to 645 at Snoqualmie River at Duvall, WA. Rivermatics issues a daily machine-learned 14-day flow outlook at 2 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 |
|---|---|---|---|---|---|---|
| Snoqualmie River near Snoqualmie, WA | WA | 375 | 111 | 2,625.7 | 1,322.3 | 14-day |
| Snoqualmie River near Carnation, WA | WA | 603 | 48 | 3,863 | 1,773.5 | 14-day |
| Snoqualmie River at Duvall, WA | WA | 645 | 25 | — | — | — |
Common questions
- How many gauges are on the Snoqualmie River?
- Rivermatics tracks 3 USGS streamgages on the Snoqualmie 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 Snoqualmie River?
- Yes, at 2 of the 3 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 Snoqualmie River part of?
- The Snoqualmie River drains into the Snohomish 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 Snoqualmie 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 Snohomish River system
- Sf Snoqualmie River 3 gauges
- South Fork Tolt River 2 gauges
- Sultan River 2 gauges