Twin Oaks Harbor, St.Clair County, Missouri.

Lake H.S. Truman Reservoir. Twin Oaks Harbor is a gated community near lake HS Truman Reservoir, in St. Clair County, Missouri. This lake is in the Lake of the Ozarks area, the Midwest's premier lake resort destination, offering world-class boating, golfing, shopping and fishing, and a wide variety of lodging, restaurants, state parks, and other recreational activities to suit any budget and taste.