Peakflow Forecasts Header

CLACKAMAS--NEAR OREGON CITY
   State:  Oregon    County:  CLACKAMAS
   Latitude:  45 22' 45" North    Longitude:  122 34' 33" West
   Elevation:  15 feet
   Supporting WFO:  Portland    
   Action Stage:  38'   Flood Stage:  39'   Moderate Flood Stage:  42'
   Major Flood Stage:  46'

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.

CLACKAMAS--NEAR OREGON CITY   (COCO3)
Forecasts for Water Year 2025
Ensemble Date: 2025-07-01
 Forecast Period: July 1 to November 1
Exceedence
Probability 		Stage
feet 		Discharge
CFS 		Probable
Date of Peak
95 % 23.74 1211 2025-07-21
90 % 23.93 1362 2025-09-05
70 % 24.55 1926 2025-10-15
50 % 25.49 3000 2025-10-25
30 % 26.13 3884 2025-10-29
10 % 28.77 8782 2025-11-01
05 % 32.28 17426 2025-11-01

Peakflow exceedence plot for COCO3

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