Barker's Island Marina is located in the historic Port Town of Superior, Wisconsin and adjacent to Duluth, MN. Superior and Duluth are also known as the "Twin Ports". The two cities share a border divided by the St. Louis River and the Duluth/Superior Harbor. The 420 slip marina is a complete boating center and marina community. Our knowledgeable and experienced staff is committed to providing you with comfortable marina living and expert service.