Sault Ste. Marie International Railroad Bridge, Spanning Soo Locks at St. Marys Falls Canal, Sault Ste. Marie, Chippewa County, MI

Significance: The Sault Ste. Marie International Railroad Bridge has nine camelback truss spans crossing the St. Marys River with bascule and vertical lift bridge components crossing the American Locks at the St. Marys Falls Canal. It is the only bridge in the United States known to include these three types of spans in a single structure to use an interlocking mechanism to connect the leaves of the double-leaf bascule span. It is Michigan's most significant railroad bridge from an engineering history standpoint and is eligible for listing in the National Register of Historic Places.
Survey number: HAER MI-324
Building/structure dates: 1887 Initial Construction
Building/structure dates: 1913 Subsequent Work
Building/structure dates: 1959 Subsequent Work