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Rowell's Covered Bridge is a covered bridge in West Hopkinton, New Hampshire, which carries Clement Hill Road over the Contoocook River. The Long truss bridge was completed in 1853, and was the third bridge on the site. The bridge is just under wide and long, and consists of a single span supported by two modified Long trusses resting on granite abutments. The trusses are distinctive in the addition of several arches, which consist of solid timbers that were spliced or butted together, and mortised into other truss members. The bridge's sturdy engineering was demonstrated by the addition of a central pier in the 20th century whose intent was to add strength. The pier, however, acted as a fulcrum, causing the bridge to seesaw under load and weakening its joints. The top of this pier was consequently removed, leaving the bridge largely as designed except for the addition of some metal reinforcing tie rods.〔(【引用サイトリンク】title=NRHP nomination for Rowell's Covered Bridge )〕 The bridge was listed on the National Register of Historic Places in 1976.〔 ==See also== *List of bridges on the National Register of Historic Places in New Hampshire *List of New Hampshire covered bridges *National Register of Historic Places listings in Merrimack County, New Hampshire 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「Rowell's Covered Bridge」の詳細全文を読む スポンサード リンク
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