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 2027
Ensemble Date: 2026-10-10
 Forecast Period: October 10 to February 1
Exceedence
Probability 		Stage
feet 		Discharge
CFS 		Probable
Date of Peak
95 % 2.35 505 2026-10-25
90 % 2.42 557 2026-10-27
70 % 2.68 760 2026-11-01
50 % 2.85 901 2026-11-07
30 % 3.21 1243 2026-11-21
10 % 3.75 1887 2027-01-06
05 % 3.87 2058 2027-01-23

Peakflow exceedence plot for SWRM8

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