Snohomish River near Monroe

1. 22.00 ftthe 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.
2. 21.00 ftFlooding 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.
3. 20.00 ftthe 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.
4. 17.00 ftthe 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.
5. 16.00 ftthe 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.
6. 15.00 ftthe 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.
7. 14.00 ftfeet...the Snohomish River will locally spill over its banks into low pasture lands along the river.

Chance of flooding, September to November

The three-month chances are the River Forecast Centers’ long-range flood outlook, issued September 20, 2026.

Most recent crests

• December 17, 2025: 16.18 ft
• December 12, 2025: 24.55 ft
• December 9, 2025: 16.35 ft
• December 6, 2023: 16.38 ft
• November 5, 2022: 15.00 ft
• March 1, 2022: 15.07 ft
• November 15, 2021: 16.60 ft
• November 13, 2021: 15.82 ft
• October 29, 2021: 15.01 ft
• February 8, 2020: 16.64 ft

• UpstreamSkykomish River at Gold Bar
• DownstreamSnohomish River at Snohomish
• Pilchuck River at Snohomish
• Snohomish River at Ebey Slough
• Sultan River at Sultan
• Snoqualmie River at Carnation
• Snoqualmie River at Carnation - Discharge
• Tolt River at Carnation
• Pilchuck Creek at Pilchuck Creek

Forecasts by the Northwest River Forecast Center. Forecasts are issued routinely year-round. 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.

Stage, flood stages, impacts and crest history from NOAA’s National Water Prediction Service. Streamflow and the daily record from the U.S. Geological Survey.