Peakflow Forecasts Header

COW CREEK--GALESVILLE RESERVOIR
   State:  Oregon    County:  DOUGLAS
   Latitude:  42 50' 56" North    Longitude:  123 10' 40" West
   Elevation:  1881 feet
   Supporting WFO:  Medford    
   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.

COW CREEK--GALESVILLE RESERVOIR   (GSVO3)
Forecasts for Water Year
2026
Ensemble Date: 2025-12-06
Forecast Period: December 6 to April 1
Exceedence
Probability
Inflow
CFS
Probable
Date of Peak
95 % 148 2025-12-28
90 % 189 2026-01-01
70 % 412 2026-01-17
50 % 774 2026-02-12
30 % 1444 2026-02-21
10 % 2400 2026-03-16
05 % 2700 2026-03-28

Peakflow exceedence plot for GSVO3

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