Peakflow Forecasts Header

HENRYS FORK--AT ST. ANTHONY
   State:  Idaho    County:  FREMONT
   Latitude:  43 58' 0" North    Longitude:  111 40' 21" West
   Elevation:  4951 feet
   Supporting WFO:  Pocatello    
   Action Stage:  6.5'   Flood Stage:  7'   Moderate Flood Stage:  8.2'
   Major Flood Stage:  
11'

Forecasts are calculated from a forecast time series that approximates flow at a 6 hour time step interval. Observed instantaneous peaks can be higher than model forecast peaks.

HENRYS FORK--AT ST. ANTHONY   (ANTI1)
Forecasts for Water Year
2026
Ensemble Date: 2026-06-10
Forecast Period: June 10 to October 1
Exceedence
Probability
Stage
feet
Discharge
CFS
Probable
Date of Peak
95 % 3.57 1332 2026-06-10
90 % 3.57 1332 2026-06-10
70 % 3.57 1332 2026-06-10
50 % 3.58 1338 2026-06-22
30 % 3.70 1526 2026-08-26
10 % 3.95 1929 2026-09-20
05 % 4.02 2063 2026-09-30

Peakflow exceedence plot for ANTI1

 Click to download runoff traces used in forecast.  Click for comma delimited data used in plot.csv icon