USCGC Mackinaw (WAGB-83) is a 290-foot (88 m) former Coast Guard icebreaker on exhibit as a museum ship at the Ice Breaker Mackinaw Maritime Museum in Mackinaw City, Michigan. The vessel has been known as the "Queen of the Great Lakes" and "The Largest Icebreaker on the Great Lakes"; the site states that "she was built ... during World War II to meet the heavy demands of war materials and transportation during the winter months".