Great Lakes of the lakes: Ontario does not border Lake Michigan, and Michigan does not border Lake Ontario. New York and Wisconsin's jurisdictions extend into two lakes, and each of the remaining states into one of the lakes. As the surfaces of Lakes Superior, Huron, Michigan, and Erie are all approximately the same elevation above sea level, while Lake Ontario is significantly lower, and because the Niagara Escarpment precludes all natural navigation, the four upper lakes are commonly called the "upper great lakes". This designation, however, is not universal. Those living on the shore of Lake Superior often refer to all the
Marine Museum of the Great Lakes history of the Calvin and Son shipyard which once employed 700 workers on Garden Island. The museum has photographed historic shipwrecks at risk of being hidden by encrustations of zebra mussels which infested the Great Lakes in the 1990s. Archaeological exhibits commemorating the War of 1812 on the Great Lakes were added for that war's bicentennial. Publications of the museum include "FreshWater", a journal of Great Lakes marine history, a "Jib Gems" museum newsletter and several books on local marine history. Extensive archives and collections are maintained with the assistance of Queen's University, documenting 19th and 20th century Canadian Great