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 2027
Ensemble Date: 2026-10-09
 Forecast Period: October 9 to February 1
Exceedence
Probability 		Stage
feet 		Discharge
CFS 		Probable
Date of Peak
95 % 5.12 2256 2026-10-14
90 % 5.12 2256 2026-10-14
70 % 5.12 2256 2026-10-14
50 % 5.12 2256 2026-10-14
30 % 5.12 2256 2026-10-14
10 % 5.73 2667 2026-11-01
05 % 6.07 2912 2026-11-28

Peakflow exceedence plot for REXI1

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