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: 2026-02-18
Forecast Period: February 18 to June 1
Exceedence
Probability
Inflow
CFS
Probable
Date of Peak
95 % 13695 2026-03-25
90 % 14696 2026-04-26
70 % 18139 2026-05-13
50 % 19375 2026-05-23
30 % 20463 2026-05-27
10 % 24075 2026-06-01
05 % 27237 2026-06-01

Peakflow exceedence plot for HHWM8

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