Peakflow Forecasts Header

SANDY--NEAR MARMOT
   State:  Oregon    County:  CLACKAMAS
   Latitude:  45 23' 30" North    Longitude:  122 7' 40" West
   Elevation:  730 feet
   Supporting WFO:  Portland    

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.

SANDY--NEAR MARMOT   (SRMO3)
Forecasts for Water Year
2026
Ensemble Date: 2026-09-10
Forecast Period: September 10 to January 1
Exceedence
Probability
Stage
feet
Discharge
CFS
Probable
Date of Peak
95 % 691.93 1915 2026-11-02
90 % 692.67 2933 2026-11-06
70 % 693.74 4980 2026-11-27
50 % 694.39 6541 2026-12-09
30 % 696.08 11948 2026-12-18
10 % 697.84 20048 2026-12-29
05 % 698.12 21608 2026-12-31

Peakflow exceedence plot for SRMO3

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