Peakflow Forecasts Header

SF FLATHEAD--HUNGRY HORSE DAM
   State:  Montana    County:  FLATHEAD
   Latitude:  48 20' 28" North    Longitude:  114 0' 47" West
   Elevation:  3560 feet
   Supporting WFO:  Missoula    
   Inflow Data  

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.

SF FLATHEAD--HUNGRY HORSE DAM   (HHWM8)
Forecasts for Water Year
2026
Ensemble Date: 2026-06-14
Forecast Period: June 14 to October 1
Exceedence
Probability
Inflow
CFS
Probable
Date of Peak
95 % 6239 2026-06-14
90 % 6239 2026-06-14
70 % 6239 2026-06-14
50 % 6239 2026-06-14
30 % 6239 2026-06-14
10 % 8610 2026-07-01
05 % 9466 2026-07-18

Peakflow exceedence plot for HHWM8

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