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 February 21, 2026
Mean Stage: 24.34 ft  Mean Flow: 11100 cfs
Max Stage: 32.93 ft  Max Flow: 33700 cfs (1986)
Min Stage:  20.32 ft   Min Flow: 5950 cfs (2023)

Statistics based on water years: 1914-2025
* 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