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Merrill Lake

Merrill Lake was formed when lava flows from Mt. St. Helens blocked the stream valley. In the early 1930's the lake was planted with Eastern Brook Trout, Rainbow Trout and Yelowstone Cutthroat. Brown Trout were introduced in 1987 and have proved to be very successful.

This fly-fishing, catch-and-release-only lake is located north of Cougar near Mount St. Helens. It is open to fishing year-round, but action is usually slow and often inaccessible during the winter months due to snow. Merrill contains Coastal Cutthroat, Brown Trout to several pounds and some Rainbow Trout and Eastern Brook Trout.

This lake is stocked annually with rainbow, browns, and brooks.

Species you might catch

Brook trout
Brown trout
Coastal cutthroat
Rainbow trout

Lake Information

Cowlitz County
Lake Acreage: 283.4
Elevation: 1,524 feet
Westside Washington

Lake Management Type
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.


Locate Locate this lake
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 NOT allowed

Special Fishing Restrictions

  • Fly Fishing Only for this lake

Access Sites / Boat Ramps on this Lake

No site or ramp information available.

Fish Plants & Stocking Reports