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: 2026-02-06
Forecast Period: February 6 to June 1
Exceedence
Probability
Stage
feet
Discharge
CFS
Probable
Date of Peak
95 % 4.50 2971 2026-04-21
90 % 4.70 3389 2026-05-01
70 % 5.00 4072 2026-05-15
50 % 5.15 4420 2026-05-21
30 % 5.37 4975 2026-05-27
10 % 5.90 6288 2026-05-30
05 % 6.15 6892 2026-05-31

Peakflow exceedence plot for ANTI1

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