A Beautiful Place to Live and a Sunrise You'll Never Forget. Lake St. Clair is a private, is located approximately 1 mile west of the City of St. Clair, Missouri off of Missouri Highway PP. Developed in the early 60's by Authorized investors Group the community consist of 450 acres of land, with 1352 lots and twenty-three miles of road. The highlight of the community are four lakes found within the subdivision. The main lake, Lake #1, covers approximately 60 acres and is used primarily for recreation such as boating skiing, fishing and other water sports. Lakes 2,3, and 4 also are used for recreational purposes however only trolling type motors are allowed on these three lakes. In the 80's the subdivision received a federal-state grant to install and operate a sewer district. Along with the Franklin Count Water Company and Ameren Missouri the subdivision has full infrastructure in place to support the 322 homes that are now within the community.