Merwin Reservoir was formed after the completion of Merwin Dam, in 1931 by the Inland Power and Light Company. The reservoir fluctuates depending on the amount of run-off making boat access difficult at times.
Kokanee are the main target, however, Tiger Muskie planted in 1995 are also popular with anglers. This North Fork Lewis River impoundment located near the town of Ariel, on the south side of Highway SR"503, is shared by Clark and Cowlitz counties.
Angling is best in early spring, with Kokanee averaging 12"inches.
All Bull Trout and Dolly Varden must be released.
PacifiCorp operates boat launches at Speelyai Bay and Cresap Bay.There is a fee to launch on weekends.Call (800) 547-1501 for updated reservoir levels.
There is very limited shore access.
Species you might catch