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: 2025-05-12
Forecast Period: May 12 to September 1
Exceedence
Probability
Stage
feet
Discharge
CFS
Probable
Date of Peak
95 % 121.66 1537 2025-05-26
90 % 121.70 1582 2025-05-28
70 % 121.94 1883 2025-06-03
50 % 122.44 2581 2025-06-09
30 % 122.97 3456 2025-06-15
10 % 123.65 4746 2025-06-23
05 % 124.28 6148 2025-06-30

Peakflow exceedence plot for TOTW1

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