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Upper Twin Falls Bridge : ウィキペディア英語版 | Upper Twin Falls Bridge }} The Upper Twin Falls Bridge is a bridge that spans the Menominee River linking Breitung Township, Michigan, to Florence County, Wisconsin. Completed in 1910, construction was prompted by the erection of a dam downstream. The bridge was closed to automobile traffic in 1971. It was listed on the National Register of Historic Places in December 2012. ==Design and location== The Upper Twin Falls Bridge is a single-span, pin-connected, camelback, through-truss bridge. It crosses the Menominee River about north of Iron Mountain, Michigan. The bridge is the only known example of its type in Michigan and one of two in Wisconsin, however the other is not in its original location.
抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「Upper Twin Falls Bridge」の詳細全文を読む
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