The Windmill Harbour MOA Fee for a 30' slip is $2,375. per year. The POA Fee is $705. per year. This 30' slip is an end slip. It abuts another 30' end slip which is C-044. It is also for sale with the same seller. Windmill Habour is the only locked marina on the east coast that opens directly onto deep water -the ICW. Home of the SC Yacht Club, Windmill Harbour was just given the Island Packet Reader's Choice Award for BEST MARINA! Lock is 75' Long; 19' Wide. Harbour is tide free. with an 8' constant depth.