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
2027
Ensemble Date: 2026-10-10
Forecast Period: October 10 to February 1
Exceedence
Probability
Inflow
CFS
Probable
Date of Peak
95 % 5378 2026-11-04
90 % 8183 2026-11-11
70 % 12564 2026-11-27
50 % 14971 2026-12-10
30 % 18011 2026-12-25
10 % 21920 2027-01-17
05 % 24034 2027-01-24

Peakflow exceedence plot for CSHW1

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