PORTNEUF − AT TOPAZ (TOPI1)
   State:  Idaho
   County:  Bannock
   Latitude:  42 37' 30" North
   Longitude:  112 5' 16" West
   Elevation:  4918 ft

   Supporting NWS Forecast Office: WFO Pocatello

   
Click for NWS Official River Forecasts for TOPI1
   


   Action Stage:  
3.5 ft
   Flood Stage:  
4 ft
Daily Historical Statistics for September 02, 2026
Mean Stage: 3.00 ft  Mean Flow: 155 cfs
Max Stage: 3.71 ft  Max Flow: 347 cfs (1986)
Min Stage:  2.45 ft   Min Flow: 70 cfs (2001)

Statistics based on water years: 1913-2024
* statistics estimated based on current rating

Record Stage: 
6 ft

The 4-10 Day Trend Forecast is based on model guidance and uncertainty during this period is greater.

Hydrograph plot for TOPI1

Data Used In Plot   "label   United States Geological Survey