Peakflow Forecasts Header

NF FLATHEAD--NEAR COLUMBIA FALLS
   State:  Montana    County:  FLATHEAD
   Latitude:  48 29' 44" North    Longitude:  114 7' 36" West
   Elevation:  3145 feet
   Supporting WFO:  Missoula    
   Action Stage:  12.5'   Flood Stage:  13'   Moderate Flood Stage:  17'
   Major Flood Stage:  19'

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.

NF FLATHEAD--NEAR COLUMBIA FALLS   (FCFM8)
Forecasts for Water Year 2026
Ensemble Date: 2026-08-16
 Forecast Period: August 16 to December 1
Exceedence
Probability 		Stage
feet 		Discharge
CFS 		Probable
Date of Peak
95 % 2.31 1085 2026-08-16
90 % 2.31 1085 2026-08-16
70 % 2.31 1085 2026-08-16
50 % 2.31 1085 2026-08-16
30 % 2.48 1259 2026-11-04
10 % 3.98 3521 2026-11-13
05 % 5.27 6472 2026-11-15

Peakflow exceedence plot for FCFM8

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