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India Point Railroad Bridge
India Point Railroad Bridge was a swing bridge which spanned the Seekonk River, connecting the City of Providence, Rhode Island at India Point to the City of East Providence at Watchemoket. It was last used in 1974, and the swing span was removed in 2001
leaving only two fixed truss spans.
== History ==
The original structure was a covered bridge built in 1835 by Thomas Hassard for the Boston and Providence Railroad. He had been mentored by Colonel Stephen H. Long, inventor of the Long truss. It held the distinction of being the first interstate railroad bridge built in the United States. The bridge had a manually operated draw consisting of two parts located on the East Providence side of the bridge. In order to let a vessel pass, the eastern part had to be moved northward and the western part was moved into the vacated space. This draw was replaced in 1858 by one resting on a turntable providing a gap of . In 1866, due to the bridge's piers being deemed unreliable, work began on a new bridge adjacent to the existing one that was to have a draw of at least . This bridge used a Howe truss and was built by Daniel Harris and Richard Hawkins, who held the patent rights for this design in Southern New England.〔 On 20 February 1868, a successful test run was made, and the main track was connected to the new bridge the following day.〔
In 1882, an iron swing section replaced the manually operated one. This provided a channel of about . However, a curve in the channel made passage through it difficult. The remaining covered part of the bridge was replaced with a steel swing span in 1902 by Boston Bridge Works giving it a channel of approximately and aligning the draw with that of the 1885 Washington Bridge〔At the time, the bridge was known as the "Seekonk River Bridge" but was eventually renamed to match its predecessors.〕 to the north. Finally, the iron swing section was replaced with fixed pony trusses in 1903. Both of these sections were built around the existing spans, so that rail and water traffic would not be interrupted. During peak working hours, trains could cross the bridge at an average rate of one every four minutes.
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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