Peakflow Forecasts Header

NF JOHN DAY--AT MONUMENT
   State:  Oregon    County:  GRANT
   Latitude:  44 48' 54" North    Longitude:  119 25' 50" West
   Elevation:  1960 feet
   Supporting WFO:  Pendleton    
   Action Stage:  12'   Flood Stage:  14'

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.

NF JOHN DAY--AT MONUMENT   (MONO3)
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 % 6.57 3381 2026-02-10
90 % 6.57 3381 2026-02-10
70 % 7.09 4205 2026-03-17
50 % 8.12 6106 2026-04-06
30 % 9.14 8213 2026-04-29
10 % 11.92 14251 2026-05-18
05 % 12.46 15484 2026-05-22

Peakflow exceedence plot for MONO3

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