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M-72–Au Sable River Bridge
The M-72–Au Sable River Bridge, also known as the Grayling Bridge or State Street Bridge, is a bridge located on M-72 over the Au Sable River in Grayling, Michigan. It was listed on the National Register of Historic Places in 1999.〔
==History==
The village of Grayling was first platted along the Au Sable River in 1874.〔(【引用サイトリンク】title= I-75BL–Au Sable River )〕 Soon after, a bridge was built at this location to facilitate travel across the river. However, the population of Grayling increased significantly in the early 1900s, and the state designated the route through Grayling as a state trunkline, both of which increased traffic over the existing bridge. In 1922, Grayling replaced the bridge with a sturdier version. However, increasingly heavy vehicular traffic used the bridge, and it was soon deemed inadequate. In 1933, the State Highway Department designed this replacement structure.〔
The bridge was built by contractor F. C. Atletwed at a cost of $13,700〔 and opened in 1935, and has continued to serve M-72 traffic in nearly unaltered condition.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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