Snoqualmie River at Snoqualmie Falls

1. 70000.0 ftthe Snoqualmie River will cause severe near record flooding from the town of Snoqualmie downstream through Fall City. Flooding will occur all along the river including headwaters...tributaries...and other streams within and near the Snoqualmie River Basin. This river level on the Snoqualmie corresponds to a phase 4 flood in the King County flood system.
2. 55000.0 ftthe Snoqualmie River will cause major flooding from the town of Snoqualmie downstream through Fall City...inundating most of the farm land in the flood plain...some residential areas...and many roads. Flood waters will be deep and swift in some areas. Flooding will occur all along the river including headwaters...tributaries...and other streams within and near the Snoqualmie River Basin. This river level on the Snoqualmie corresponds roughly to a phase 4 flood in the King County flood system.
3. 41000.0 ftthe Snoqualmie River will cause major flooding from the town of Snoqualmie downstream through Fall City...inundating most of the farm land in the flood plain...some residential areas...and many roads. Flood waters will be deep and swift in some areas. Flooding will occur all along the river including headwaters...tributaries...and other streams within and near the Snoqualmie River Basin. This river level on the Snoqualmie corresponds roughly to a phase 4 flood in the King County flood system.
4. 30000.0 ftthe Snoqualmie River will cause widespread flooding of pasture lands and roads along the river from the town of Snoqualmie downstream through Fall City. Roads that may become flooded include Fall City-Carnation...Tolt Hill...and Novelty Flats Roads. This river level on the Snoqualmie corresponds roughly to a phase 3 flood in the King County flood system.
5. 20000.0 ftthe Snoqualmie River will cause widespread flooding of pasture lands and roads along the river from the town of Snoqualmie downstream through Fall City. Roads that may become flooded include Fall City-Carnation...Tolt Hill...and Novelty Flats Roads. This river level on the Snoqualmie corresponds roughly to a phase 3 flood in the King County flood system.
6. 12000.0 ftthe Snoqualmie River will spill over its banks between the town of Snoqualmie and Fall City...covering pasture lands and several roads along the river. This river level on the Snoqualmie corresponds roughly to a phase 2 flood in the King County flood system.

Chance of flooding, September to November

The three-month chances are the River Forecast Centers’ long-range flood outlook, issued September 21, 2026.

Most recent crests

• December 17, 2025: 14.98 ft
• December 10, 2025: 19.95 ft
• December 9, 2025: 17.88 ft
• November 5, 2022: 16.95 ft
• January 12, 2022: 14.98 ft
• January 13, 2021: 14.55 ft
• February 1, 2020: 16.79 ft
• December 30, 2018: 12.82 ft
• November 23, 2017: 14.77 ft
• November 22, 2017: 13.76 ft

• UpstreamMiddle Fork Snoqualmie River at M Fk Snoqualmie R nr Tanner
• DownstreamSnoqualmie River at Carnation
• North Fork Snoqualmie River at Snoqualmie Falls
• Snoqualmie River at Carnation - Discharge
• Issaquah Creek at Issaquah
• Issaquah Creek at Hobart
• Tolt River at Carnation
• Cedar River (WA) at Chester Morse Lk at Cedar Falls

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.