Peakflow Forecasts Header

HENRYS FORK--AT REXBURG
   State:  Idaho    County:  MADISON
   Latitude:  43 49' 32" North    Longitude:  111 54' 18" West
   Elevation:  4806 feet
   Supporting WFO:  Pocatello    
   Action Stage:  9'   Flood Stage:  9.5'   Moderate Flood Stage:  11.5'
   Major Flood Stage:  
13'

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 REXBURG   (REXI1)
Forecasts for Water Year
2026
Ensemble Date: 2026-06-06
Forecast Period: June 6 to October 1
Exceedence
Probability
Stage
feet
Discharge
CFS
Probable
Date of Peak
95 % 4.24 1754 2026-06-12
90 % 4.24 1754 2026-06-12
70 % 4.24 1754 2026-06-12
50 % 4.24 1754 2026-06-12
30 % 4.44 1884 2026-06-29
10 % 5.11 2333 2026-09-24
05 % 5.43 2552 2026-10-01

Peakflow exceedence plot for REXI1

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