Peakflow Forecasts Header

BIG LOST--AT HOWELL RANCH NEAR CHILLY
   State:  Idaho    County:  CUSTER
   Latitude:  43 59' 54" North    Longitude:  114 1' 16" West
   Elevation:  6622 feet
   Supporting WFO:  Pocatello    
   Action Stage:  3.51'   Flood Stage:  4'

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.

BIG LOST--AT HOWELL RANCH NEAR CHILLY   (HWRI1)
Forecasts for Water Year
2026
Ensemble Date: 2026-09-10
Forecast Period: September 10 to January 1
Exceedence
Probability
Stage
feet
Discharge
CFS
Probable
Date of Peak
95 % 0.98 97 2026-09-10
90 % 0.98 97 2026-09-10
70 % 0.98 97 2026-09-10
50 % 1.03 109 2026-10-04
30 % 1.07 119 2026-10-10
10 % 1.18 147 2026-10-30
05 % 1.33 190 2026-11-01

Peakflow exceedence plot for HWRI1

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