Peakflow Forecasts Header

MARYS--NEAR PHILOMATH
   State:  Oregon    County:  BENTON
   Latitude:  44 31' 35" North    Longitude:  123 19' 59" West
   Elevation:  224 feet
   Supporting WFO:  Portland    
   Action Stage:  16'   Flood Stage:  20'   Moderate Flood Stage:  21'
   Major Flood Stage:  21.5'

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.

MARYS--NEAR PHILOMATH   (PHIO3)
Forecasts for Water Year 2026
Ensemble Date: 2026-08-18
 Forecast Period: August 18 to December 1
Exceedence
Probability 		Stage
feet 		Discharge
CFS 		Probable
Date of Peak
95 % 3.71 129 2026-10-25
90 % 4.62 193 2026-11-06
70 % 7.53 549 2026-11-19
50 % 9.79 920 2026-11-24
30 % 14.76 1891 2026-11-27
10 % 19.31 3751 2026-11-30
05 % 20.65 5123 2026-11-30

Peakflow exceedence plot for PHIO3

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