Peakflow Forecasts Header

SWAN--NEAR BIGFORK
   State:  Montana    County:  LAKE
   Latitude:  48 1' 27" North    Longitude:  113 58' 44" West
   Elevation:  3063 feet
   Supporting WFO:  Missoula    
   Action Stage:  6'   Flood Stage:  6.5'   Moderate Flood Stage:  7.5'
   Major Flood Stage:  
8'

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.

SWAN--NEAR BIGFORK   (SWRM8)
Forecasts for Water Year
2026
Ensemble Date: 2026-03-14
Forecast Period: March 14 to July 1
Exceedence
Probability
Stage
feet
Discharge
CFS
Probable
Date of Peak
95 % 4.60 3249 2026-05-17
90 % 4.73 3493 2026-05-23
70 % 5.04 4093 2026-06-01
50 % 5.38 4765 2026-06-07
30 % 5.68 5359 2026-06-15
10 % 6.15 6325 2026-06-24
05 % 6.52 7093 2026-06-30

Peakflow exceedence plot for SWRM8

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