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UMATILLA--NEAR GIBBON
   State:  Oregon    County:  UMATILLA
   Latitude:  45 43' 10" North    Longitude:  118 19' 19" West
   Elevation:  1855 feet
   Supporting WFO:  Pendleton    
   Action Stage:  6'   Flood Stage:  7'   Moderate Flood Stage:  9'
   Major Flood Stage:  11.5'

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.

UMATILLA--NEAR GIBBON   (GIBO3)
Forecasts for Water Year 2026
Ensemble Date: 2025-11-14
 Forecast Period: November 14 to March 1
Exceedence
Probability 		Stage
feet 		Discharge
CFS 		Probable
Date of Peak
95 % 4.22 373 2025-12-11
90 % 4.41 438 2025-12-20
70 % 5.17 856 2026-01-09
50 % 5.52 1100 2026-01-29
30 % 5.73 1273 2026-02-10
10 % 8.01 3838 2026-02-24
05 % 8.95 5329 2026-02-28

Peakflow exceedence plot for GIBO3

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