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: 2025-11-15
 Forecast Period: November 15 to March 1
Exceedence
Probability 		Stage
feet 		Discharge
CFS 		Probable
Date of Peak
95 % 2.63 650 2025-11-21
90 % 2.63 650 2025-11-21
70 % 2.66 672 2025-11-23
50 % 2.76 762 2025-12-03
30 % 2.90 888 2026-01-09
10 % 3.28 1293 2026-02-22
05 % 3.53 1590 2026-02-28

Peakflow exceedence plot for SWRM8

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