Snoqualmie River at Snoqualmie Falls, WA
River level and flood forecast · King County
Normalas of Mon 8:30 PM
Forecast to hold near 1.1 ft through Thu, Oct 22, 5 AM.
Flow: 590 cubic feet per second (USGS).
The last 7 days and the forecast
NWS forecast issued Mon, Oct 12, 8:24 AM. Forecasts change as rain falls and as upstream water arrives.
What floods at each level
From the National Weather Service, highest first.
- 70000 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.
- 55000 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.
- 41000 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.
- 30000 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.
- 20000 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.
- 12000 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.
Highest crests on record
- 21.55 ft — November 24, 1990
- 20.97 ft — January 7, 2009
- 20.31 ft — November 7, 2006
- 19.95 ft — December 10, 2025
- 19.78 ft — November 23, 1959
Recent crests: 14.98 ft (December 17, 2025) · 19.95 ft (December 10, 2025) · 17.88 ft (December 9, 2025) · 16.95 ft (November 5, 2022) · 14.98 ft (January 12, 2022)
Up and down the river, and nearby
- UpstreamMiddle Fork Snoqualmie River near Tanner, WA
- North Fork Snoqualmie River near Snoqualmie Falls, WA
- Snoqualmie River near Carnation - Discharge, WA
- Issaquah Creek near Issaquah, WA
- Issaquah Creek near Hobart, WA
- Tolt River near Carnation, WA
- Cedar River (WA) at Chester Morse Lk at Cedar Falls, WA
- Cedar River (WA) near Landsburg, WA
Not an official source. River levels, forecasts, flood stages and impacts are from the National Weather Service (SQUW1); flow from the U.S. Geological Survey. Readings are provisional. In a flood, follow your local officials and the NWS at weather.gov.