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FLATHEAD--AT COLUMBIA FALLS
   State:  Montana    County:  FLATHEAD
   Latitude:  48 21' 42" North    Longitude:  114 11' 2" West
   Elevation:  2978 feet
   Supporting WFO:  Missoula    
   Action Stage:  12.5'   Flood Stage:  13'   Moderate Flood Stage:  18'
   Major Flood Stage:  22'

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.

FLATHEAD--AT COLUMBIA FALLS   (CFMM8)
Forecasts for Water Year 2026
Ensemble Date: 2026-02-06
 Forecast Period: February 6 to June 1
Exceedence
Probability 		Stage
feet 		Discharge
CFS 		Probable
Date of Peak
95 % 10.36 27078 2026-04-12
90 % 10.79 29297 2026-04-24
70 % 11.26 31782 2026-05-15
50 % 11.82 34875 2026-05-20
30 % 12.30 37577 2026-05-27
10 % 12.93 41297 2026-06-01
05 % 13.53 44939 2026-06-01

Peakflow exceedence plot for CFMM8

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