Isle Royale National Park is a U.S. National Park on Isle Royale and adjacent islands in Lake Superior, in the state of Michigan. Isle Royale National Park was established on April 3, 1940; designated as a National Wilderness Area in 1976; and made an International Biosphere Reserve in 1980. The park covers 894 square miles (2,320 km2), with 209 square miles (540 km2) above water. At the Canada–US border, it meets the borders of the Canadian Lake Superior National Marine Conservation Area.
Isle Royale, the largest island in Lake Superior, is over 45 miles (72 km) in length and 9 miles (14 km) wide at its widest point.[3]The park is made up of Isle Royale itself and approximately 400 smaller islands, along with any submerged lands within 4.5 miles (7.2 km) of the surrounding islands.
Isle Royale National Park is an angler’s paradise. Whether you are fishing Lake Superior or the inland lakes, by boat or on foot, there is exciting sport fishing abound. Through the management of fish and aquatic environments, the park works to preserve and restore native fisheries and their habitats, and provide recreational fishing opportunities for the enjoyment of park visitors.
Isle Royale National Park is open every year from April 16 through October 31. The island is closed from November 1 through April 15 due to extreme winter weather conditions and for the safety and protection of visitors. This closure extends 4.5 miles out into Lake Superior from the island. The park headquarters during the winter is in Houghton, Michigan. The summer headquarters is located at Mott Island on Isle Royale National Park.
Source:
https://www.nps.gov/ISRO/planyourvisit/index.htm
https://en.wikipedia.org/wiki/Salt_Lake_City