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 2026
Ensemble Date: 2025-12-06
 Forecast Period: December 6 to April 1
Exceedence
Probability 		Stage
feet 		Discharge
CFS 		Probable
Date of Peak
95 % 39.35 41450 2025-12-11
90 % 39.35 41450 2025-12-11
70 % 39.35 41450 2025-12-11
50 % 39.35 41450 2025-12-11
30 % 39.35 41450 2025-12-11
10 % 40.48 46148 2026-01-11
05 % 42.87 56868 2026-02-06

Peakflow exceedence plot for COCO3

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