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
SS City of Milwaukee navigation of the vessel took place. There is also a small pilot house on the stern that is used for docking the vessel. The ship was built in 1930 and launched in 1931 at Manitowoc, Wisconsin to replace , which sank with all hands on October 22, 1929 during a gale. Car ferry service had been introduced to the Great Lakes in 1892, and there was many as 14 vessels operating on the lakes at the system's peak. These specialized vessels were capable of carrying up to 34 railroad cars across the often stormy and ice-packed lakes at any time