LEWIS − ARIEL (MERW1)
   State:  Washington
   County:  Cowlitz
   Latitude:  45 57' 2" North
   Longitude:  122 33' 51" West
   Elevation:  44 ft

   Supporting NWS Forecast Office: WFO Portland

   
Click for NWS Official River Forecasts for MERW1
   

Daily Historical Statistics for June 29, 2026
Mean Stage: 2.60 ft  Mean Flow: 2800 cfs
Max Stage: 5.34 ft  Max Flow: 7950 cfs (1946)
Min Stage:  0.64 ft   Min Flow: 215 cfs (1931)

Statistics based on water years: 1924-2025
* statistics estimated based on current rating

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

Hydrograph plot for MERW1

Data Used In Plot   "label   USGS Observations