ISSAQUAH CREEK − NEAR MOUTH (ISSW1)
   State:  Washington
   County:  King
   Latitude:  47 33' 9" North
   Longitude:  122 2' 49" West
   Elevation:  36 ft

   Supporting NWS Forecast Office: WFO Seattle
   Click for NWS Official River Forecasts for ISSW1
   

   Action Flow:  1340 cfs (9.03 ft)
   Flood Flow:  2000 cfs (10.69 ft)
   Moderate Flood Flow:  2300 cfs (11.37 ft)
   Major Flood Flow:  2800 cfs (12.45 ft)
Daily Historical Statistics for June 11, 2026
Mean Stage: 4.41 ft  Mean Flow: 87 cfs
Max Stage: 5.84 ft  Max Flow: 466 cfs (2010)
Min Stage:  3.91 ft   Min Flow: 27 cfs (1992)

Statistics based on water years: 1964-2025
* statistics estimated based on current rating

Record Stage: 14.69 ft
Record Flow: 3200 cfs
Date of Record: January 9, 1990

The 4-10 Day Trend Forecast is based on model guidance and uncertainty during this period is greater.

Hydrograph plot for ISSW1

Data Used In Plot   "label   USGS Observations