Calumet Island is an island in the 1000 Islands on the St. Lawrence River. It is located right outside of Clayton, New York and once had a castle on it until about 1957. Today all that remains is the water tower, which has been converted to a light house of sorts, the Ice House, the power house, the skiff house, the servant's house, and the boat house. In the 1960s and early 1970s it was the site of the Calumet Island Marina.