Peakflow Forecasts Header

SANDY--SANDY
   State:  Oregon    County:  CLACKAMAS
   Latitude:  45 26' 57" North    Longitude:  122 14' 37" West
   Elevation:  240 feet
   Supporting WFO:  Portland    
   Action Stage:  18'   Flood Stage:  19.3'   Moderate Flood Stage:  20.5'
   Major Flood Stage:  21.5'

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--SANDY   (SNDO3)
Forecasts for Water Year 2025
Ensemble Date: 2025-07-05
 Forecast Period: July 5 to November 1
Exceedence
Probability 		Stage
feet 		Discharge
CFS 		Probable
Date of Peak
95 % 7.98 497 2025-07-08
90 % 8.25 666 2025-08-05
70 % 8.46 818 2025-10-12
50 % 9.86 2366 2025-10-21
30 % 10.70 3809 2025-10-29
10 % 12.55 8511 2025-11-01
05 % 16.46 23406 2025-11-01

Peakflow exceedence plot for SNDO3

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