SF STILLAGUAMISH − NEAR GRANITE FALLS (GFLW1)
   State:  Washington
   County:  Snohomish
   Latitude:  48 6' 13" North
   Longitude:  121 56' 44" West
   Elevation:  310 ft

   Supporting NWS Forecast Office: WFO Seattle
   Click for NWS Official River Forecasts for GFLW1
   
Daily Historical Statistics for January 16, 2026
Mean Flow: 1650 cfs
Max Flow: 10400 cfs (1974)
Min Flow: 210 cfs (1952)

Statistics based on water years: 1929-1980
* 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 GFLW1

Data Used In Plot   "label   USGS Observations