The American Soo Locks

Front:
ARO L. RYERSON

Back:
THE AMERICAN SOO LOCKS Sault Ste. Marie, Michigan The EDWARD L. RYERSON, of the Inland Steel Co., one of the largest freighters on the Great Lakes (730 feet long) downbound in the McArthur Lock. The purpose of the locks is to overcome the approximately 20-foot difference in level between Lake Superior on the west and Lake Huron on the southeast. 1963 Hiawatha Card Co., Mackinaw City, Mich. 49701 33013-H 14812 Photo by Don and Lucy Gridley