COLUMBIA − BLO ROCK ISLAND DAM (RISW1)
   State:  Washington
   County:  Douglas
   Latitude:  47 19' 57" North
   Longitude:  120 4' 48" West
   Elevation:  609 ft

   Supporting NWS Forecast Office: WFO Spokane
   Click for NWS Official River Forecasts for RISW1
Daily Historical Statistics for March 28, 2023
Mean Flow: 109000 cfs
Max Flow: 217000 cfs (1983)
Min Flow: 34200 cfs (1993)

Statistics based on water years: 1962-2021
* 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 RISW1


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Hydrograph plot for RISW1


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Hydrograph plot for RISW1


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Hydrograph plot for RISW1


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