Diablo Lake in the Washington Cascades; Viewpoint is located right off Highway 20 in the Ross Lake National Recreation Area. It's a popular recreational area with campers, hikers, and boaters. The Diablo Lake Adventure Tours
run Friday through Sunday in July and August and weekends only in June and September. Call 206-684-3030 for more information. Note: Highway 20 is closed usually November to April during snow season.