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Lake Merwin

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

Bull trout
Chinook salmon
Coho salmon
Kokanee
Northern pikeminnow
Sculpin
Tiger muskie

Lake Information

Clark County
Lake Acreage: 3,835.6
Elevation: 242 feet
Westside Washington

Lake Management Type
Mixed species - Trout emphasis

Sport Fishing Regulations & Seasons

Emergency Rule Updates
Fishing closures and openings happen constantly throughout the year. The E-Rules keep you up-to-date.


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This feature shows the general location of the selected body of water. Directions may not include routes to boat launches or other water access sites. Check below for access sites or read the description for specific access information. Please do not trespass on private property.
Two-Pole Fishing Allowed

Access Sites / Boat Ramps on this Lake

Other Lake Access

Fish Plants & Stocking Reports