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The Dalton Covered Bridge, also called the Dalton Bridge, is a historic covered bridge that carries Joppa Road over the Warner River in Warner, New Hampshire. Its name refers to a nearby resident (first "Mrs. Dalton", then "Widow Dalton") at the time of its construction. The bridge was built in 1853 by Joshua Sanborn, and its original abutments were built by George Sawyer and Webster Davis; all were local residents. The bridge has a span of , with a total bridge length (including portals and roof) of . The bridge is wide, with a road bed width of , although guard rails have reduced its usable width to just under .〔(【引用サイトリンク】title=NRHP nomination for Dalton Covered Bridge )〕 The bridge uses a combination of truss types to support the load, following a patent issued in 1837 to Stephen Long, who also patented the Long truss. Its primary support mechanism is a king post truss, in which a vertical post is joined to chord members by iron bolts. This primary support is supplemented by a queen post truss system that flank the king truss walls. The trusses are mounted on abutments that are primarily fieldstone, but were capped in concrete in the 20th century. The mounting is secured by iron tension rods. The exterior walls of the bridge are vertical boarding with four windows; this finish was also rehabilitated in the 1960s. The gabled roof is made of corrugated metal.〔 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 *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「Dalton Covered Bridge」の詳細全文を読む スポンサード リンク
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