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: 2025-05-14
 Forecast Period: May 14 to September 1
Exceedence
Probability 		Stage
feet 		Discharge
CFS 		Probable
Date of Peak
95 % 9.00 1301 2025-05-18
90 % 9.00 1301 2025-05-18
70 % 9.04 1349 2025-05-26
50 % 9.97 2528 2025-06-03
30 % 10.63 3661 2025-06-09
10 % 12.17 7360 2025-06-16
05 % 13.06 10119 2025-06-25

Peakflow exceedence plot for SNDO3

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