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UMATILLA--AT PENDLETON
   State:  Oregon    County:  UMATILLA
   Latitude:  45 40' 15" North    Longitude:  118 47' 30" West
   Elevation:  1050 feet
   Supporting WFO:  Pendleton    
   Action Stage:  11'   Flood Stage:  12.3'   Moderate Flood Stage:  13.5'
   Major Flood Stage:  17'

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.

UMATILLA--AT PENDLETON   (PDTO3)
Forecasts for Water Year 2026
Ensemble Date: 2026-02-18
 Forecast Period: February 18 to June 1
Exceedence
Probability 		Stage
feet 		Discharge
CFS 		Probable
Date of Peak
95 % 6.50 1385 2026-03-04
90 % 6.77 1664 2026-03-05
70 % 7.04 1963 2026-03-16
50 % 7.65 2634 2026-03-26
30 % 8.28 3403 2026-04-14
10 % 9.99 5677 2026-05-11
05 % 10.70 6680 2026-05-21

Peakflow exceedence plot for PDTO3

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