COWLITZ − BELOW MAYFIELD DAM (MAYW1)
   State:  Washington
   County:  Lewis
   Latitude:  46 30' 37" North
   Longitude:  122 36' 58" West
   Elevation:  227 ft

   Supporting NWS Forecast Office: WFO Seattle
   Click for NWS Official River Forecasts for MAYW1
   

   Action Flow:  17000 cfs (15.97 ft)
   Flood Flow:  25000 cfs (18.06 ft)
   Moderate Flood Flow:  35000 cfs (20.27 ft)
   Major Flood Flow:  45000 cfs (22.26 ft)
Daily Historical Statistics for March 16, 2026
Mean Stage: 12.36 ft  Mean Flow: 6800 cfs
Max Stage: 18.50 ft  Max Flow: 26900 cfs (1972)
Min Stage:  10.03 ft   Min Flow: 2560 cfs (1941)

Statistics based on water years: 1935-2024
* statistics estimated based on current rating

Record Flow: 68400 cfs
Date of Record: November 28, 1995

The 4-10 Day Trend Forecast is based on model guidance and uncertainty during this period is greater.

Hydrograph plot for MAYW1

Data Used In Plot   "label   USGS Observations