Peakflow Forecasts Header

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: 2026-04-18
 Forecast Period: April 18 to August 1
Exceedence
Probability 		Stage
feet 		Discharge
CFS 		Probable
Date of Peak
95 % 5.07 956 2026-04-23
90 % 5.07 956 2026-04-23
70 % 5.07 956 2026-04-23
50 % 5.07 956 2026-04-23
30 % 5.07 956 2026-04-23
10 % 5.31 1123 2026-05-13
05 % 5.68 1420 2026-05-26

Peakflow exceedence plot for GIBO3

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