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

railroad bridges bascule bridges vertical lift bridges truss bridges sault sainte marie mich sault ste sault ste marie international railroad bridge marie international railroad bridge soo locks soo locks marys falls marys falls canal chippewa chippewa county michigan canadian national railroad fairbanks scale company incorporated gray and pape historic american engineering record rebecca kumar james c pritchard kimberly starbuck lena sweeten us army corps of engineers photo ultra high resolution high resolution library of congress national register of historic places

1969 - 1980

Library of Congress

http://www.loc.gov/

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