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
2027
Ensemble Date: 2026-10-10
Forecast Period: October 10 to February 1
Exceedence
Probability
Stage
feet
Discharge
CFS
Probable
Date of Peak
95 % 3.91 1872 2026-10-12
90 % 3.91 1872 2026-10-12
70 % 3.91 1872 2026-10-12
50 % 3.91 1872 2026-10-12
30 % 3.91 1872 2026-10-12
10 % 4.04 2098 2026-10-30
05 % 4.21 2406 2026-11-06

Peakflow exceedence plot for ANTI1

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