EF LEWIS − NEAR HEISSON (HSSW1)
   State:  Washington
   County:  Clark
   Latitude:  45 50' 13" North
   Longitude:  122 27' 54" West
   Elevation:  366 ft

   Supporting NWS Forecast Office: WFO Portland
   Click for NWS Official River Forecasts for HSSW1
Daily Historical Statistics for December 07, 2025
Mean Stage: 13.97 ft  Mean Flow: 1420 cfs
Max Stage: 17.36 ft  Max Flow: 5930 cfs (1976)
Min Stage:  10.21 ft   Min Flow: 50 cfs (1930)

Statistics based on water years: 1930-2025
* statistics estimated based on current rating

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

Hydrograph plot for HSSW1


For Data Used In Plot   "label