Peakflow Forecasts Header

CLARK FORK--AT ST REGIS
   State:  Montana    County:  MINERAL
   Latitude:  47 18' 6" North    Longitude:  115 5' 11" West
   Elevation:  2600 feet
   Supporting WFO:  Missoula    
   Action Stage:  18'   Flood Stage:  19'   Moderate Flood Stage:  21'
   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.

CLARK FORK--AT ST REGIS   (SRGM8)
Forecasts for Water Year 2026
Ensemble Date: 2026-04-15
 Forecast Period: April 15 to August 1
Exceedence
Probability 		Stage
feet 		Discharge
CFS 		Probable
Date of Peak
95 % 12.15 22414 2026-05-01
90 % 12.54 24103 2026-05-05
70 % 12.92 25827 2026-05-15
50 % 13.29 27557 2026-05-22
30 % 13.59 28971 2026-05-31
10 % 14.56 33848 2026-06-10
05 % 15.48 38756 2026-06-14

Peakflow exceedence plot for SRGM8

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