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 2027
Ensemble Date: 2026-10-10
 Forecast Period: October 10 to February 1
Exceedence
Probability 		Stage
feet 		Discharge
CFS 		Probable
Date of Peak
95 % 4.31 962 2026-11-09
90 % 4.54 1210 2026-11-23
70 % 5.14 1967 2026-12-12
50 % 6.23 3837 2027-01-07
30 % 7.01 5583 2027-01-16
10 % 8.18 9744 2027-01-28
05 % 8.49 11105 2027-01-31

Peakflow exceedence plot for TRYO3

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