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
2027
Ensemble Date: 2026-10-05
Forecast Period: October 5 to February 1
Exceedence
Probability
Inflow
CFS
Probable
Date of Peak
95 % 805 2026-10-19
90 % 959 2026-10-23
70 % 2417 2026-11-04
50 % 3392 2026-11-09
30 % 5987 2026-11-21
10 % 10045 2026-12-16
05 % 11256 2027-01-16

Peakflow exceedence plot for HHWM8

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