Peakflow Forecasts Header

GRANDE RONDE--TROY
   State:  Oregon    County:  WALLOWA
   Latitude:  45 56' 45" North    Longitude:  117 27' 0" West
   Elevation:  1586 feet
   Supporting WFO:  Pendleton    
   Action Stage:  8'   Flood Stage:  10'   Moderate Flood Stage:  11'
   Major Flood Stage:  12'

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.

GRANDE RONDE--TROY   (TRYO3)
Forecasts for Water Year 2026
Ensemble Date: 2026-02-14
 Forecast Period: February 14 to June 1
Exceedence
Probability 		Stage
feet 		Discharge
CFS 		Probable
Date of Peak
95 % 6.69 6929 2026-03-09
90 % 7.01 7881 2026-03-14
70 % 7.77 10335 2026-04-09
50 % 8.28 12281 2026-04-26
30 % 8.92 14943 2026-05-05
10 % 9.76 18910 2026-05-24
05 % 10.48 22708 2026-05-31

Peakflow exceedence plot for TRYO3

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