Peakflow Forecasts Header

TOUTLE--AT TOWER ROAD NEAR SILVER LAKE
   State:  Washington    County:  COWLITZ
   Latitude:  46 20' 2" North    Longitude:  122 50' 20" West
   Elevation:  170 feet
   Supporting WFO:  Portland    
   Action Stage:  135'   Flood Stage:  137'   Moderate Flood Stage:  139'
   Major Flood Stage:  140'

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.

TOUTLE--AT TOWER ROAD NEAR SILVER LAKE   (TOTW1)
Forecasts for Water Year 2026
Ensemble Date: 2026-06-14
 Forecast Period: June 14 to October 1
Exceedence
Probability 		Stage
feet 		Discharge
CFS 		Probable
Date of Peak
95 % 121.15 959 2026-06-14
90 % 121.15 959 2026-06-14
70 % 121.15 959 2026-06-14
50 % 121.15 959 2026-06-14
30 % 121.51 1313 2026-09-17
10 % 122.01 1905 2026-09-29
05 % 122.57 2705 2026-10-01

Peakflow exceedence plot for TOTW1

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