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 March 09, 2026
Mean Stage: 13.54 ft  Mean Flow: 1130 cfs
Max Stage: 17.57 ft  Max Flow: 6350 cfs (1966)
Min Stage:  11.25 ft   Min Flow: 204 cfs (2005)

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

Data Used In Plot   "label   USGS Observations