Peakflow Forecasts Header

CLARK FORK--NEAR PLAINS
   State:  Montana    County:  SANDERS
   Latitude:  47 25' 46" North    Longitude:  114 51' 18" West
   Elevation:  2449 feet
   Supporting WFO:  Missoula    
   Action Stage:  15'   Flood Stage:  16'   Moderate Flood Stage:  18'
   Major Flood Stage:  19.5'

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--NEAR PLAINS   (PLNM8)
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 % 10.87 49416 2026-05-01
90 % 11.07 50984 2026-05-05
70 % 11.86 57445 2026-05-15
50 % 12.15 59892 2026-05-22
30 % 12.60 63785 2026-05-29
10 % 13.61 72802 2026-06-11
05 % 14.54 81479 2026-06-18

Peakflow exceedence plot for PLNM8

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