Peakflow Forecasts Header

NF SKOKOMISH--CUSHMAN DAM
   State:  Washington    County:  MASON
   Latitude:  47 25' 25" North    Longitude:  123 13' 10" West
   Elevation:  760 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.

NF SKOKOMISH--CUSHMAN DAM   (CSHW1)
Forecasts for Water Year
2025
Ensemble Date: 2025-07-01
Forecast Period: July 1 to November 1
Exceedence
Probability
Inflow
CFS
Probable
Date of Peak
95 % 368 2025-07-02
90 % 1074 2025-08-02
70 % 1948 2025-10-12
50 % 2594 2025-10-21
30 % 4894 2025-10-26
10 % 11576 2025-10-31
05 % 17902 2025-10-31

Peakflow exceedence plot for CSHW1

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