317 

SRUS46 KPQR 182230

RVMPQR



Hydrologic Statement 

National Weather Service Portland OR

330 PM PDT Mon May 18 2026



WAZ040-18330-

330 PM PDT Mon May 18 2026



Current status of reservoirs on the Lewis River, updated 330 PM

Mon, May 18 2026.



RESERVOIR        CURRENT POOL ELEV      FULL POOL

Swift Reservoir         996              1000 FT

Yale Lake               479               490 FT

Lake Merwin             236               240 FT



As of 330 PM PDT, Mon May 18, 2026, the remaining aggregate

storage for refill at Merwin, Yale, and Swift reservoirs is

19 feet.

 

This product is updated hourly on the NWS Portland webpage at:

www.wrh.noaa.gov/total_forecast/getprod.php?wfo=pqr&sid=PQR&pil=RVM

or 

http://go.usa.gov/x97zc

 

Additional hydrologic information can be viewed at:

water.weather.gov/ahps2/index.php?wfo=pqr



$$