COLUMBIA − ROCKY REACH DAM (RRHW1)
   State:  Washington
   County:  Chelan
   Latitude:  47 31' 27" North
   Longitude:  120 18' 3" West
   Elevation:  703 ft

   Supporting NWS Forecast Office: WFO Spokane
   Click for NWS Official River Forecasts for RRHW1
   
Daily Historical Statistics for July 11, 2026
Mean Flow: 152000 cfs
Max Flow: 320000 cfs (1964)
Min Flow: 40900 cfs (2001)

Statistics based on water years: 1961-2024
* 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 RRHW1

Data Used In Plot   "label   Chelan County Public Utility Observations   Rocky Reach Dam   USACE Map   


Hydrograph plot for RRHW1

Data Used In Plot   "label   Chelan County Public Utility Observations   Rocky Reach Dam   USACE Map   


Hydrograph plot for RRHW1

Data Used In Plot   "label   Chelan County Public Utility Observations   Rocky Reach Dam   USACE Map   


Hydrograph plot for RRHW1

Data Used In Plot   "label   Chelan County Public Utility Observations   Rocky Reach Dam   USACE Map