Anderson Lake State Park is a public recreation area on the Quimper Peninsula, 7 mi south of Port Townsend, in Jefferson County, Washington. The state park has 496 acres of woods and wetland that slope down to 70 acre Anderson Lake. The park offers picnicking, trails for hiking, biking, and equestrian use, non-motorized boating, fishing, and birdwatching. The presence of toxic algae forbids water use of any kind from time to time. Algae blooms generally occur during late spring and summer months.