Lock S-310 allows passage through the Herbert Hoover Dike into the small port at Clewiston, where the Army Corps has a field station for continuous maintenance projects on the dike. A monument notes the 1932 to 1938 construction period for the first version of the dike, with 16 miles of levees on the north shore, and 68 miles of levees along the south shore. After flooding and hurricanes in the 1940s, the flood control system for South Florida was expanded and the dike was remade taller and longer, creating, by the late 1960s, the 143-foot-long structure of today. The dike provides the ten million people of southern Florida with some degree of flood protection (from the interior, at least).