Tolt River near Carnation, WA
River level and flood forecast · King County
Normalas of Mon 8:15 PM
Forecast to hold near 0.3 ft through Thu, Oct 22, 5 AM.
Flow: 134 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.
- 10500 ftthe Tolt River will cause severe flooding. Dangerously deep and quick flood waters will cover roads and driveways...with some homes flooded. The river will likely overtop some levees. Erosion could cause serious damage and channel changes may occur. Flooding will occur all along the river including headwaters...tributaries...and other streams within and near the Tolt River Basin. This river level on the Tolt corresponds to a phase 4 flood in the King County flood system.
- 8500 ftthe Tolt River will cause major flooding. Deep and quick flood waters will cover roads and driveways...cutting off access to many homes. Levees may overtop and channel changes may occur. Flooding will occur all along the river including headwaters...tributaries...and other streams within and near the Tolt River Basin. This river level on the Tolt corresponds to a phase 4 flood in the King County flood system.
- 5000 ftthe Tolt River will flood Tolt River Rd NE and many driveways. Some homes in the San Souci area could be inaccessible due to deep and quick flood waters. This river level on the Tolt corresponds to a phase 3 flood in the King County flood system.
- 3500 ftthe Tolt River will spill over its banks with water over 353rd Ave NE and some driveways in the San Souci area. This river level on the Tolt corresponds to a phase 2 flood in the King County flood system.
Highest crests on record
- 13.04 ft — December 15, 1959
- 12.92 ft — February 9, 1951
- 12.59 ft — January 8, 2009
- 12.52 ft — December 11, 1955
- 12.14 ft — January 7, 1945
Recent crests: 10.16 ft (December 10, 2025) · 9.41 ft (November 4, 2022) · 9.89 ft (January 12, 2022) · 9.19 ft (February 22, 2021) · 8.87 ft (January 12, 2021)
Up and down the river, and nearby
- Snoqualmie River near Carnation - Discharge, WA
- North Fork Snoqualmie River near Snoqualmie Falls, WA
- Snoqualmie River at Snoqualmie Falls, WA
- Skykomish River near Gold Bar, WA
- Snohomish River near Monroe, WA
- Issaquah Creek near Issaquah, WA
- Sultan River near Sultan, WA
- Middle Fork Snoqualmie River near Tanner, WA
Not an official source. River levels, forecasts, flood stages and impacts are from the National Weather Service (TOLW1); flow from the U.S. Geological Survey. Readings are provisional. In a flood, follow your local officials and the NWS at weather.gov.