Major Flood
17 ft
Current Water Level
Gage Height
Loading...
Streamflow
Loading...
Last Reading
Loading...
FLOOD STAGES
Know the flood categories.
Flood stages defined by the National Weather Service. Gage height data from USGS Water Resources.
Moderate Flood
16 ft
Minor Flood
15 ft
Action Stage
10 ft
What Floods at Each Level
22 ft
the Snohomish River will cause severe flooding...with deep and swift flood waters inundating farm land...residential areas...and roads. Levees could suffer overtopping and major damage. Flooding will occur all along the river including headwaters...tributaries...and other streams within and near the Snohomish River Basin. A stage of 22 feet at this location corresponds to Phase 4 in the Snohomish County Flood Warning System.
21 ft
Flooding will occur all along the river including headwaters...tributaries...and other streams within and near the Snohomish River Basin. The Snohomish River stage at this location corresponds to Phase 4 in the Snohomish County Flood Warning System.
20 ft
the Snohomish River will cause severe flooding in the valley. The river will flood many homes...cover much of the farmlands...and close 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 20 feet at this location corresponds to Phase 3 in the Snohomish County Flood Warning System.
17 ft
the Snohomish River will cause major flooding...inundating farm land...roads...and some residential areas. Levees will likely suffer damage. Flooding will occur all along the river including headwaters...tributaries...and other streams within and near the Snohomish River Basin. A stage of 17 feet at this location corresponds to Phase 2 in the Snohomish County Flood Warning System.
16 ft
the Snohomish River will flood several roads and much of the low pasture land in the river valley. A stage of 16 feet at this location corresponds to Phase 2 in the Snohomish County Flood Warning System.
15 ft
the Snohomish River will cause minor flooding of low pasture lands and several roads near the river. A stage of 15 feet at this location corresponds to Phase 2 in the Snohomish County Flood Warning System.
14 ft
feet...the Snohomish River will locally spill over its banks into low pasture lands along the river.
Impact statements from the National Weather Service, describing what typically happens at each water level.
7-Day Water Level Chart
Loading chart data...
Historic Crests
| Date | Stage | Flow |
|---|---|---|
| Nov 25, 1990 | 25.3 ft | 150,000 cfs |
| Dec 11, 2025 | 24.55 ft | 106,222 cfs |
| Jan 8, 2009 | 24.12 ft | 132,000 cfs |
About This Gauge
USGS Site
NWS LID
MROW1
River
Snohomish River
County
Snohomish, WA
Coordinates
47.8311°N, 122.0472°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 near Monroe?
The Snohomish River near Monroe gauge is maintained by USGS (site 12150800) 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 near Monroe?
The NWS-defined flood stage for Snohomish River near Monroe is 15 feet. Action stage begins at 10 feet. Moderate flooding starts at 16 feet, and major flooding at 17 feet.
How do I get alerts when Snohomish River rises?
Download StormCast free on Google Play, go to River Gauges, and add Snohomish River near Monroe 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 near Monroe gauge located?
The gauge is located in Snohomish County, Washington at coordinates 47.8311°N, 122.0472°W. USGS site number: 12150800. Data is provided by the U.S. Geological Survey and the National Weather Service.
More Gauges on Snohomish River
On This River
More Resources
Source & Notes
Data provided by: U. S. 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.