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Black Suspension Bridge
The Black Bridge spans the Colorado River in the inner canyon of Grand Canyon National Park. It is part of the South Kaibab Trail and is the river crossing used by mules going to Phantom Ranch. The Black Bridge and Silver Bridge are the only spans in hundreds of river miles.
== History ==
The Black Bridge was built in 1928. As motorized vehicles could not access the construction site, humans and mules transported the 122 tons in materials down the nine miles of trail. Walking single file, 42 Havasupai tribesmen carried the one-ton, 550-foot suspension cables.〔"(Black Bridge )". ''Nature, Culture and History at the Grand Canyon''.
Arizona State University. Retrieved July 16, 2014.〕
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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