Peakflow Forecasts Header

IMNAHA--AT IMNAHA
   State:  Oregon    County:  WALLOWA
   Latitude:  45 33' 43" North    Longitude:  116 49' 59" West
   Elevation:  1968 feet
   Supporting WFO:  Pendleton    
   Action Stage:  5'   Flood Stage:  5.5'   Moderate Flood Stage:  7'
   Major Flood Stage:  
9'

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.

IMNAHA--AT IMNAHA   (IMNO3)
Forecasts for Water Year
2026
Ensemble Date: 2026-02-06
Forecast Period: February 6 to June 1
Exceedence
Probability
Stage
feet
Discharge
CFS
Probable
Date of Peak
95 % 3.66 1141 2026-03-26
90 % 3.91 1369 2026-04-10
70 % 4.25 1721 2026-04-22
50 % 4.47 1964 2026-05-05
30 % 4.75 2323 2026-05-17
10 % 5.27 3070 2026-05-30
05 % 5.56 3524 2026-06-01

Peakflow exceedence plot for IMNO3

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