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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: 2026-09-10
 Forecast Period: September 10 to January 1
Exceedence
Probability 		Stage
feet 		Discharge
CFS 		Probable
Date of Peak
95 % 4.97 6075 2026-09-10
90 % 4.97 6075 2026-09-10
70 % 4.97 6075 2026-09-10
50 % 5.47 7413 2026-10-17
30 % 6.00 8973 2026-11-04
10 % 7.80 15268 2026-11-12
05 % 8.83 19527 2026-11-21

Peakflow exceedence plot for CFMM8

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