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__NOTOC__ Rachel Carson Bridge, also known as the Ninth Street Bridge, spans the Allegheny River in Downtown Pittsburgh, Pennsylvania. The total length is including the main span and two side spans, or including the approaches. The total width of the deck is , including the roadway plus two sidewalks outside the compressive plate girder. Whereas the roadway formerly carried two vehicle lanes and two streetcar tracks, it now carries two wide vehicle lanes. Named for the naturalist Rachel Carson, a Pittsburgh native, it is one of three parallel bridges called The Three Sisters, the others being the Roberto Clemente Bridge and the Andy Warhol Bridge. The Three Sisters are self-anchored suspension bridges and are significant because they are the only trio of nearly identical bridges—as well as the first self-anchored suspension spans—built in the United States. ==History== The bridge was dedicated and opened at a noon ceremony with Commissioner Babcock, Mayor Kline, and city council members including Herron and McArdle. The cost of construction was $1.46 million or $ in terms. The bridge was renamed on Earth Day, April 22, 2006, after years of lobbying by Esther Barazzone, president of Chatham University, the alma mater of the renowned environmentalist. Carson was born in 1907 in Springdale, Pennsylvania, in a farmhouse up the Allegheny River, now the Rachel Carson Homestead.〔 *〕 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「Rachel Carson Bridge」の詳細全文を読む スポンサード リンク
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