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
2025
Ensemble Date: 2025-05-14
Forecast Period: May 14 to September 1
Exceedence
Probability
Stage
feet
Discharge
CFS
Probable
Date of Peak
95 % 5.27 4248 2025-05-21
90 % 5.27 4248 2025-05-21
70 % 5.27 4248 2025-05-21
50 % 5.29 4286 2025-05-28
30 % 5.61 4833 2025-06-05
10 % 5.96 5487 2025-06-19
05 % 6.12 5778 2025-06-22

Peakflow exceedence plot for BONM8

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