Peakflow Forecasts Header

CHEHALIS--NEAR DOTY
   State:  Washington    County:  LEWIS
   Latitude:  46 37' 1" North    Longitude:  123 16' 42" West
   Elevation:  302 feet
   Supporting WFO:  Seattle    
   Action Stage:  315.5'   Flood Stage:  318'   Moderate Flood Stage:  323.5'
   Major Flood Stage:  324.5'

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.

CHEHALIS--NEAR DOTY   (DOTW1)
Forecasts for Water Year 2025
Ensemble Date: 2025-07-14
 Forecast Period: July 14 to November 1
Exceedence
Probability 		Stage
feet 		Discharge
CFS 		Probable
Date of Peak
95 % 306.18 37 2025-08-12
90 % 306.40 68 2025-10-04
70 % 307.15 241 2025-10-19
50 % 308.69 930 2025-10-26
30 % 309.81 1672 2025-10-31
10 % 311.64 3332 2025-11-01
05 % 311.94 3658 2025-11-01

Peakflow exceedence plot for DOTW1

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