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
The Great Lakes Group towing of vessels and barges, icebreaking, as well as rescue and assistance to grounded or damaged ships with a fleet of nearly forty tugboats stationed throughout U.S. Great Lakes ports. Throughout its corporate history, The Great Lakes Towing Company has always operated a Cleveland Shipyard. Originally located on jefferson Road in the Flats until the Great Cuyahoga River fire in 1952 when it moved to the present site in the Old River Bed, the Shipyard constructed many of its tugs and repaired all of the Towing Company's tugs and barges throughout its history. Great Lakes Shipyard is located in the