Peakflow Forecasts Header

MIDDLE SANTIAM--GREEN PETER DAM
   State:  Oregon    County:  LINN
   Latitude:  44 27' 15" North    Longitude:  122 33' 0" West
   Elevation:  1015 feet
   Supporting WFO:  Portland    
   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.

MIDDLE SANTIAM--GREEN PETER DAM   (GPRO3)
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 % 359 2026-06-14
90 % 359 2026-06-14
70 % 359 2026-06-14
50 % 374 2026-06-29
30 % 438 2026-09-18
10 % 923 2026-09-26
05 % 1247 2026-09-30

Peakflow exceedence plot for GPRO3

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