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A bascule bridge (also referred to as a drawbridge or a lifting bridge) is a moveable bridge with a counterweight that continuously balances a span, or leaf, throughout its upward swing to provide clearance for boat traffic. It may be single- or double-leafed.
Animation showing the operation of a drawbridge. A drawbridge or draw-bridge is a type of moveable bridge typically at the entrance to a castle or tower surrounded by a moat.In some forms of English, including American English, the word drawbridge commonly refers to all types of moveable bridges, such as bascule bridges, vertical-lift bridges and swing bridges, but this article concerns the ...
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The Sparkill Creek Drawbridge is a historic Pratt Pony Truss drawbridge located at Piermont in Rockland County, New York. It was built in 1880 by the King Iron Bridge Company of Cleveland, Ohio, and is a single-leaf movable metal bridge. Chains can lift the bridge when an operator turns a crank, helped by counterweights.
In American English, the term is synonymous with drawbridge, and the latter is the common term, but drawbridge can be limited to the narrower, historical definition used in some other forms of English, in which drawbridge refers to only a specific type of moveable bridge often found in castles.
In another respect, it remains among the busiest even today: due to its low vessel clearance of 30 feet (9.1 m), [7] the Fremont Bridge opens an average of 35 times a day, which makes it the most frequently opened drawbridge in the United States [8] and one of the busiest bascule bridges in the world. [9]
Although a 3,300-foot-long (1,000 m) tunnel was proposed as a replacement in February 1907, [18] the Salt Lake had already applied to replace the fixed trestle span with a drawbridge in September 1906. [19] The location for the new drawbridge was set in May 1907, [20] and the first piles were driven in December 1907. [21]
Traditional use of the term "rolling bridge" dates from at least the Victorian era, and is used to describe a type of retractable drawbridge used to span a ditch or moat surrounding a fortification. That type of bridge is not hinged, and remains horizontal when it is rolled inside the gates of a fort.