Major Flood
29 ft
Current Water Level
Gage Height
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Streamflow
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Last Reading
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FLOOD STAGES
Know the flood categories.
Flood stages defined by the National Weather Service. Gage height data from USGS Water Resources.
Moderate Flood
27 ft
Minor Flood
25 ft
Action Stage
20 ft
What Floods at Each Level
33 ft
the Snohomish River will cause severe near record flooding. Flood waters will likely overtop levees...with major levee damage possible. Flood waters will inundate much of the river valley...including SR2 west of Monroe...SR9 and the Lowell-Snohomish River Rd. Flooding will occur all along the river including headwaters...tributaries...and other streams within and near the Snohomish River Basin. A stage of 33 feet on the Snohomish River corresponds to a Phase 4 in the Snohomish County flood program.
32 ft
the Snohomish River will cause major flooding. Overtopping begins at French Slough area. Flood waters will likely overtop other levees...with major levee damage possible. Flood waters will inundate much of the lowlands and many roads. Flooding will occur all along the river including headwaters...tributaries...and other streams within and near the Snohomish River Basin. A stage of 32 feet on the Snohomish River corresponds to a Phase 4 in the Snohomish County flood program.
31 ft
the Snohomish River will cause major flooding. Flood waters will likely overtop levees...with major levee damage possible. Flood waters will inundate much of the valley and many roads. Flooding will occur all along the river including headwaters...tributaries...and other streams within and near the Snohomish River Basin. A stage of 31 feet on the Snohomish River corresponds to a Phase 4 in the Snohomish County flood program.
30 ft
the Snohomish River will flood low farm lands and several roads...including Riverview Rd and the Snohomish-Monroe highway. Hide tidal levels could worsen flooding on the lower delta and Ebey Island. Levees may be damaged. Berms start overtopping at this level. Flooding will occur all along the river including headwaters...tributaries...and other streams within and near the Snohomish River Basin. This stage on the Snohomish River corresponds to a Phase 4 in the Snohomish County flood program.
29 ft
the Snohomish River will flood low farm lands and several roads...including Riverview Rd and the Snohomish-Monroe highway. Hide tidal levels could worsen flooding on the lower delta and Ebey Island. Flooding will occur all along the river including headwaters...tributaries...and other streams within and near the Snohomish River Basin. A stage of 29 feet on the Snohomish River corresponds to a Phase 3 in the Snohomish County flood program.
28 ft
the Snohomish River will flood several roads...including the Snohomish-Monroe highway and Riverview Road...and low areas of the lower Snohomish valley that are not protected by levees. A stage of 28 feet on the Snohomish River corresponds to a Phase 3 in the Snohomish County flood program.
27 ft
the Snohomish River will flood several roads...including the Snohomish-Monroe highway...and low areas of the lower Snohomish valley that are not protected by levees. A stage of 27 feet on the Snohomish River corresponds roughly to a Phase 2 in the Snohomish County flood program.
25 ft
the Snohomish River will cause minor flooding of lowlands not protected by levees and on the Old Snohomish-Monroe highway. A stage of 25 feet on the Snohomish River corresponds to a Phase 2 in the Snohomish County flood program.
Impact statements from the National Weather Service, describing what typically happens at each water level.
7-Day Water Level Chart
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Historic Crests
| Date | Stage | Flow |
|---|---|---|
| Dec 11, 2025 | 34.15 ft | -1 cfs |
| Nov 24, 1990 | 33.5 ft | -1 cfs |
| Nov 7, 2006 | 33.49 ft | 111,688 cfs |
About This Gauge
USGS Site
NWS LID
SNAW1
River
Snohomish River
County
Snohomish, WA
Coordinates
47.9127°N, 122.1065°W
Get Flood Alerts for Snohomish River
StormCast monitors this gauge and sends a push notification to your phone when the water level crosses into a new flood category — even at 3 AM.
Frequently Asked Questions
What is the current water level of Snohomish River at Snohomish?
The Snohomish River at Snohomish gauge is maintained by USGS (site 12155500) and reports water levels every 15 minutes. Visit this page to see the latest reading updated live, or download StormCast to get push alerts when levels rise.
What is flood stage for Snohomish River at Snohomish?
The NWS-defined flood stage for Snohomish River at Snohomish is 25 feet. Action stage begins at 20 feet. Moderate flooding starts at 27 feet, and major flooding at 29 feet.
How do I get alerts when Snohomish River rises?
Download StormCast free on Google Play, go to River Gauges, and add Snohomish River at Snohomish to your watchlist. StormCast will send a push notification to your phone whenever the water level crosses into a new NWS flood category.
Where is the Snohomish River at Snohomish gauge located?
The gauge is located in Snohomish County, Washington at coordinates 47.9127°N, 122.1065°W. USGS site number: 12155500. Data is provided by the U.S. Geological Survey and the National Weather Service.
More Gauges on Snohomish River
On This River
Upstream: Snohomish River near Monroe
More Resources
Source & Notes
Data provided by: US Geological Survey, Observations courtesy of U.S. Geological Survey
- River forecasts for this location take into account past and future precipitation. The stages/flows that will occur may be different if future rainfall is different than forecast.