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 Old River Channel on the Cuyahoga River in Cleveland, Ohio. In 2007, the Shipyard began new construction of tugboats. On July 29, 2011, the Shipyard debuted its new Mobile Vessel Hoist, named "America" after one of the company's original tugboats. The 770-ton hoist, manufactured by Marine Travelift, is the largest of its kind on the Great Lakes, second-largest in the Western Hemisphere and third-largest in the world. Great Lakes Shipyard recently teamed up with Rolls-Royce Commercial Marine Inc. to create a marine service center. Rolls-Royce's repair and overhaul services in the Great Lakes Region will be performed by Rolls-Royce in