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COWLITZ--MOSSYROCK RESERVOIR
   State:  Washington    County:  LEWIS
   Latitude:  46 32' 7" North    Longitude:  122 25' 24" West
   Elevation:  679 feet
   Supporting WFO:  Seattle    
   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.

COWLITZ--MOSSYROCK RESERVOIR   (MSRW1)
Forecasts for Water Year
2025
Ensemble Date: 2025-06-30
Forecast Period: June 30 to October 1
Exceedence
Probability
Inflow
CFS
Probable
Date of Peak
95 % 2629 2025-07-01
90 % 2629 2025-07-01
70 % 2629 2025-07-01
50 % 2629 2025-07-01
30 % 2629 2025-07-01
10 % 4081 2025-09-25
05 % 4869 2025-09-30

Peakflow exceedence plot for MSRW1

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