ISSAQUAH CREEK − NEAR MOUTH (ISSW1)
   State:  Washington
   County:  King
   Latitude:  47 33' 0" North
   Longitude:  122 3' 0" 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 July 13, 2025
Mean Stage: 4.51 ft  Mean Flow: 50 cfs
Max Stage: 5.39 ft  Max Flow: 242 cfs (1972)
Min Stage:  4.18 ft   Min Flow: 20 cfs (2004)

Statistics based on water years: 1964-2024
* 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


For Data Used In Plot   "label