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
2025
Ensemble Date: 2025-07-03
Forecast Period: July 3 to November 1
Exceedence
Probability
Stage
feet
Discharge
CFS
Probable
Date of Peak
95 % 120.59 641 2025-07-08
90 % 120.70 722 2025-09-19
70 % 121.44 1439 2025-10-12
50 % 122.00 2129 2025-10-22
30 % 122.95 3652 2025-10-29
10 % 124.40 6757 2025-11-01
05 % 125.25 9037 2025-11-01

Peakflow exceedence plot for TOTW1

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