F-Loop will remain open this winter for a trial run. The loop will be first-come, first-served beginning Nov. 1. Located in the Cascade Mountains, Detroit Lake State Park is the gateway to beautiful Detroit Lake. The 400-foot-deep lake was created in 1953 when the U.S. Army Corp of Engineers completed the Detroit Dam project. The lake is over nine miles long with more than 32 miles of shore line. This is the spot for all types of water sports: fishing, boating, swimming, water skiing, and personal watercraft. The park has a large campground bordering the lake. Along with two swimming areas, you'll find two playgrounds, a wildlife viewing area, and a visitor center with historical exhibits and a store with gifts, ice, soft drinks, firewood, souvenirs and educational toys.