The authority placed a convict camp on the island in 1951. In an extension of the lease-convict system, compared to slavery in its abuses, the mostly African-American prisoners performed the manual labor needed to prepare the island for public use. They planted landscaping for drainage, dug and built the foundations of motels and neighborhoods, and built the perimeter road. From September 1951 to December 1954, the island was primarily closed to the public. Upon completion of the six-year causeway project and erection of the drawbridge on December 11, 1954, Jekyll Island officially re-opened for public use.