Lake Sylvia park, Montesano, WA.

Lake Sylvia State Park is a 233-acre (94 ha) state-operated, public recreation area in the northern part of Montesano in Grays Harbor County, Washington. The park is located in dense temperate rain forest.The park offers swimming, hiking, camping, fishing, and non-motored boating. It was built around an old lumber mill pond, which was used for a few years to power the town's first electrical generation plant.