- Seaquest State Park covers 475.13 acres with 5,640 feet of freshwater shoreline on Silver Lake. Also included is 116 acres of wetlands. There are 76 campsites, 16 trailer sites, four bicycle sites, 113 picnic sites, a kitchen shelter (accommodates 100), a campfire ring, six horseshoe pits, four swings, two Big Toy sets, a group camp area with three Adirondack shelters which can accommodate 50 persons, two cooking shelters, and 8.0 miles of hiking trails. Under cooperative agreement with the U.S. Forest Service, the Mt. St. Helen's National Volcanic Monument Interpretive Center is located on State Park property across from the entrance to Seaquest State Park.
Recreation - Recreational activities include fishing for trout, salmon, and spiny-ray fish; camping, picnicking, horseshoes, playground activities, and hiking.
Climate - Influenced by the Pacific Ocean and surrounding mountains, this area is characterized by a generally wet and temperate climate. Winters are cool and cloudy with rain and some snow. Maximum winter temperatures are normally in the mid- to high 40s with minimum temperatures in the mid 30s. Summers are warm and relatively dry with maximum and minimum temperatures in the mid 70s and low 50s, respectively.
Seaquest State Park, in southwest Washington is located 5.5 miles east of Castle Rock on State Highway 504 (Spirit Lake Memorial Hwy. SR504) at Silver Lake in Cowlitz County.