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Chain Bridge (Massachusetts)
The Chain Bridge is a 225-foot, single-span suspension bridge, which crosses the right branch of the Merrimack River flowing around Deer Island. As the boundary between the city of Newburyport and the city of Amesbury, Massachusetts runs through Deer Island, Chain Bridge does connect the two communities. Crossing from the island to the left bank of the Merrimack requires traversing the Derek S. Hines Memorial Bridge, formerly the Essex-Merrimack Drawbridge〔(Boston Globe, October 12, 2006 )〕 (reconstructed and reopened in August, 2012〔(Boston Globe, August 16, 2012 )〕). As the Chain Bridge is better known because of its structure, it is often incorrectly represented in literature as a single bridge spanning the Merrimack.
The current span was completed in 1910 at the site of two previous bridges. The first was a timber-arch truss which existed between 1792 and 1810. It was replaced in 1810 by a wrought-iron chain suspension bridge.〔(Description of 1810 Chain Bridge on Bridgemeister Web site )〕 This was replaced by the current span in 1909, which is still referred to as "Chain Bridge".〔(HABS/HAER report )〕
The Chain Bridge is the only suspension bridge currently maintained by the Massachusetts Department of Transportation. In 1990 the bridge was part of a statewide survey as part of the Massachusetts Historic Bridge Recording Project. It has undergone several renovations, most recently in 2003.〔(History of renovations on Structurae Web site )〕
==References==
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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