BIG LOST − NEAR ARCO (ARCI1)
   State:  Idaho
   County:  Butte
   Latitude:  43 34' 55" North
   Longitude:  113 16' 14" West
   Elevation:  5240 ft

   Supporting NWS Forecast Office: WFO Boise

   
Click for NWS Official River Forecasts for ARCI1
Daily Historical Statistics for October 08, 2025
Mean Stage: 3.15 ft  Mean Flow: 54 cfs
Max Stage: 4.56 ft  Max Flow: 347 cfs (1984)
Min Stage:  2.03 ft   Min Flow: 0 cfs (1961)

Statistics based on water years: 1947-2025
* 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 ARCI1


For Data Used In Plot   "label