GREEN − BELOW HOWARD HANSON DAM (HAHW1)
   State:  Washington
   County:  King
   Latitude:  47 17' 1" North
   Longitude:  121 47' 48" West
   Elevation:  990 ft

   Supporting NWS Forecast Office: WFO Seattle

   
Click for NWS Official River Forecasts for HAHW1
   

Daily Historical Statistics for September 21, 2026
Mean Stage: 4.69 ft  Mean Flow: 366 cfs
Max Stage: 6.80 ft  Max Flow: 1370 cfs (1968)
Min Stage:  4.12 ft   Min Flow: 211 cfs (2003)

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 HAHW1

Data Used In Plot   "label   United States Geological Survey