Pollepel Island is a 6.5-acre uninhabited island in the Hudson River in New York, United States. The principal feature on the island is Bannerman's Castle, an abandoned military surplus warehouse. Pollepel Island has been called many different names, including Pollopel Island, Pollopel's Island, Bannerman's Island, and Bannermans' Island. Pollepel is a D…Pollepel Island is a 6.5-acre uninhabited island in the Hudson River in New York, United States. The principal feature on the island is Bannerman's Castle, an abandoned military surplus warehouse. Pollepel Island has been called many different names, including Pollopel Island, Pollopel's Island, Bannerman's Island, and Bannermans' Island. Pollepel is a Dutch word meaning " ladle"