Lake St. Clair Metropark/Metro Beach Metropark is a 770-acre unit of the Huron-Clinton Metroparks system located roughly 20 miles (32 km) northeast of downtown Detroit, Michigan in Harrison Township, Macomb County. Lake St. Clair Metropark has been in existence since 1950 and has seen many changes since then. Originally named St. Clair Metropolitan Beach, it was renamed in 1953 to Metropolitan Beach Metropark and later shortened to Metro Beach Metropark.