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
2026
Ensemble Date: 2026-06-14
Forecast Period: June 14 to October 1
Exceedence
Probability
Inflow
CFS
Probable
Date of Peak
95 % 214 2026-06-14
90 % 214 2026-06-14
70 % 391 2026-07-28
50 % 714 2026-09-06
30 % 1440 2026-09-21
10 % 2087 2026-09-28
05 % 6628 2026-09-30

Peakflow exceedence plot for CSHW1

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