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Pennsylvania Avenue Bridge ：ウィキペディア英語版

Pennsylvania Avenue Bridge

The Pennsylvania Avenue Bridge conveys Pennsylvania Avenue across Rock Creek and the adjoining Rock Creek and Potomac Parkway, between the neighborhoods of Georgetown and Foggy Bottom in Northwest Washington, D.C. Pennsylvania Avenue terminates at M Street immediately west of the bridge.〔
==Original bridge==

The original bridge at this site was constructed of large cast iron pipes by the Army Corps of Engineers in 1858 to 1860. Montgomery C. Meigs designed the bridge and supervised its construction as part of the original construction of the Washington Aqueduct. It was officially named the Meigs Bridge after it was completed, although name that never caught on and it was often called other names such as the Tubular Bridge.
At the time of its construction it was the only bridge made completely of cast iron of substantial size in the United States. It was originally intended to be solely an aqueduct bridge carrying water mains connected to the Georgetown Reservoir, but the onset of the Civil War necessitated making it a vehicular crossing as well.〔 The level of traffic was such that the wooden deck had to be replaced every three years.〔
The bridge used an innovative design in which the 48-inch water pipes themselves formed the load-bearing arches of the bridge supporting the roadway.〔 A water pressure engine in the west abutment supplied water to a reservoir at the current site of the Georgetown branch of the D. C. Public Library to feed the significant part of the City of Georgetown that was too high to be directly fed by the main Washington Aqueduct.〔 A horse-drawn streetcar line crossed the bridge from 1863 to 1872, when it was rerouted over the nearby M Street Bridge.〔

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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