Peakflow Forecasts Header

KOOTENAI--LIBBY DAM
   State:  Montana    County:  LINCOLN
   Latitude:  48 28' 0" North    Longitude:  115 19' 0" West
   Elevation:  2459 feet
   Supporting WFO:  Missoula    
   Inflow Data  

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.

KOOTENAI--LIBBY DAM INFLOW   (LYDM8)
Forecasts for Water Year
2027
Ensemble Date: 2026-10-10
Forecast Period: October 10 to February 1
Exceedence
Probability
Inflow
CFS
Probable
Date of Peak
95 % 4651 2026-10-11
90 % 4651 2026-10-11
70 % 4651 2026-10-11
50 % 6013 2026-10-25
30 % 9049 2026-11-07
10 % 14197 2026-11-26
05 % 19322 2026-12-06

Peakflow exceedence plot for LYDM8

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