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 2025
Ensemble Date: 2025-05-14
 Forecast Period: May 14 to September 1
Exceedence
Probability 		Stage
feet 		Discharge
CFS 		Probable
Date of Peak
95 % 6.71 7029 2025-05-19
90 % 6.71 7029 2025-05-19
70 % 6.71 7029 2025-05-19
50 % 6.73 7087 2025-05-22
30 % 7.51 9448 2025-06-03
10 % 8.23 12084 2025-06-10
05 % 8.93 14985 2025-06-16

Peakflow exceedence plot for TRYO3

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