SNAKE − BELOW SWAN FALLS (SWAI1)
   State:  Idaho
   County:  Ada
   Latitude:  43 17' 30" North
   Longitude:  116 25' 12" West
   Elevation:  2271 ft

   Supporting NWS Forecast Office: WFO Boise

   
Click for NWS Official River Forecasts for SWAI1
   

Daily Historical Statistics for September 26, 2026
Mean Stage: 22.94 ft  Mean Flow: 8860 cfs
Max Stage: 26.68 ft  Max Flow: 16000 cfs (1917)
Min Stage:  20.50 ft   Min Flow: 6130 cfs (1915)

Statistics based on water years: 1914-2024
* 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 SWAI1

Data Used In Plot   "label   USGS Observations