Issaquah Creek near Issaquah, WA
River level and flood forecast · King County
Normalas of Mon 8:15 PM
Forecast to hold near 0.0 ft through Mon, Oct 19, 11 PM.
Flow: 25 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.
- 2800 ftIssaquah Creek will cause severe near record flooding in Issaquah valley. Deep and swift flood waters will inundate residential and business areas and numerous roads. Flooding will occur all along the river including headwaters...tributaries...and other streams within and near the Issaquah Creek Basin.
- 2300 ftIssaquah Creek will cause major flooding in most of the valley. Deep and swift flood waters will inundate residential and business areas and numerous roads. Flooding will occur all along the river including headwaters...tributaries...and other streams within and near the Issaquah Creek Basin.
- 2000 ftIssaquah Creek will flood most low areas in the valley. Swift waters will flood residential and business areas and roads including Newport Way.
- 1200 ftIssaquah Creek will spill over its banks into low flood prone areas of the valley.
Highest crests on record
- 13.5 ft — January 9, 1990
- 13.43 ft — November 24, 1990
- 13.2 ft — November 24, 1986
- 12.84 ft — February 8, 1996
- 12.56 ft — January 8, 2009
Recent crests: 11.74 ft (December 11, 2025) · 9.07 ft (January 13, 2021) · 8.97 ft (January 3, 2021) · 12.33 ft (February 6, 2020) · 8.89 ft (February 1, 2020)
Up and down the river, and nearby
Not an official source. River levels, forecasts, flood stages and impacts are from the National Weather Service (ISSW1); flow from the U.S. Geological Survey. Readings are provisional. In a flood, follow your local officials and the NWS at weather.gov.