Peakflow Forecasts Header

BLACKFOOT--NEAR BONNER
   State:  Montana    County:  MISSOULA
   Latitude:  46 53' 58" North    Longitude:  113 45' 20" West
   Elevation:  3345 feet
   Supporting WFO:  Missoula    
   Action Stage:  9.5'   Flood Stage:  10'   Moderate Flood Stage:  16'
   Major Flood Stage:  17'

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.

BLACKFOOT--NEAR BONNER   (BONM8)
Forecasts for Water Year 2026
Ensemble Date: 2026-08-15
 Forecast Period: August 15 to December 1
Exceedence
Probability 		Stage
feet 		Discharge
CFS 		Probable
Date of Peak
95 % 2.35 771 2026-08-15
90 % 2.35 771 2026-08-15
70 % 2.35 771 2026-08-15
50 % 2.35 771 2026-08-15
30 % 2.35 771 2026-08-15
10 % 2.35 771 2026-08-15
05 % 2.85 1212 2026-11-07

Peakflow exceedence plot for BONM8

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