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
2027
Ensemble Date: 2026-10-13
Forecast Period: October 13 to February 1
Exceedence
Probability
Stage
feet
Discharge
CFS
Probable
Date of Peak
95 % 123.83 5120 2026-11-10
90 % 124.25 5812 2026-11-22
70 % 125.60 8346 2026-12-09
50 % 126.56 10449 2026-12-27
30 % 127.82 13572 2027-01-09
10 % 130.11 21995 2027-01-23
05 % 132.96 30688 2027-01-28

Peakflow exceedence plot for TOTW1

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