Peakflow Forecasts Header

TRASK--TILLAMOOK
   State:  Oregon    County:  TILLAMOOK
   Latitude:  45 26' 23" North    Longitude:  123 43' 5" West
   Elevation:  50 feet
   Supporting WFO:  Portland    
   Action Stage:  15'   Flood Stage:  16.5'   Moderate Flood Stage:  19'
   Major Flood Stage:  22'

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.

TRASK--TILLAMOOK   (TRAO3)
Forecasts for Water Year 2026
Ensemble Date: 2026-08-16
 Forecast Period: August 16 to December 1
Exceedence
Probability 		Stage
feet 		Discharge
CFS 		Probable
Date of Peak
95 % 7.92 1210 2026-10-21
90 % 8.27 1478 2026-11-02
70 % 9.84 2880 2026-11-14
50 % 11.09 4247 2026-11-22
30 % 12.09 5484 2026-11-25
10 % 18.51 16824 2026-11-29
05 % 19.84 19851 2026-11-30

Peakflow exceedence plot for TRAO3

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