The park is located on Lake Merwin, which is part of a three-dam hydroelectric project on the Lewis River.
The lake was formed by the construction of the Merwin Dam, which was completed in 1931.
The area is a recognized habitat for wintering bald eagles, often spotted near the water.
The reservoir is managed primarily for hydroelectric power generation, which causes water levels to fluctuate seasonally.
Merwin Park is a riverside day-use area located along the north shore of the Lewis River, situated directly downstream from the Merwin Dam. Managed by PacifiCorp, the park offers expansive lawns and immediate river access for recreational activities. It serves as a primary access point for fishing and boating on Lake Merwin, a reservoir created by the dam. The park features maintained picnic areas, restroom facilities, and designated swimming zones. Its landscape is defined by the steep, forested hillsides typical of the lower Cascade foothills.
The shoreline near the park’s edge, providing a frame of the river leading toward the base of the dam.
Check water levels in advance, as the beach area can change significantly based on hydroelectric generation needs.
Bring your own supplies, as there are no retail shops or food vendors located directly within the park boundaries.
Do not attempt to swim near the dam structures or boat ramps where underwater currents can be hazardous.
The park typically experiences seasonal closures or restricted access during the winter months.
Leash your pets at all times, carry out all trash, and respect designated no-wake zones for watercraft.
