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A moveable bridge, or movable bridge, is a bridge that moves to allow passage for boats [1] or barges. [2] 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 ...
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.
The bridge was built by James P. Edward of Fox and Howard Inc. of Chicago. Three local men raised $47,000 in stocks for the toll bridge. Construction began in the spring of 1875 and was finished in the spring of 1876. [9] This was replaced by a steel swing bridge, the Portage Canal Swing Bridge, built by the King Bridge Company in 1895. The ...
It is the only double-deck bridge with independent lifts in the world. [22] Murray Morgan Bridge – Steel lift bridge in Tacoma, Washington, notable for its height above water, sloping span, and overhead span to carry a water pipe; closed October 23, 2007.
The Aerial Lift Bridge, earlier known as the Aerial Bridge or Aerial Ferry Bridge, is a landmark in the port city of Duluth, Minnesota. The span began life in 1905 as the United States' first transporter bridge : Only one other was ever constructed in the country, Sky Ride in Chicago . [ 2 ]
A vertical-lift bridge or just lift bridge is a type of movable bridge in which a span rises vertically while remaining parallel with the deck. The vertical lift offers several benefits over other movable bridges such as the bascule and swing-span bridges. Generally speaking, they cost less to build for longer moveable spans. [1]
The new spans are 20 feet (6.1 m) higher than the old bridge, high enough to allow most boats and small ships to pass underneath without having to raise the bridge and reducing the projected number of annual traffic-hindering openings from about 260 to about 60. [33] [26]
Admiral Clarey Bridge, also known as the Ford Island Bridge, is a 4,672 ft (1,424 m) road bridge that connects Ford Island in Pearl Harbor to the mainland of Oahu, the third-largest island of Hawaii. A 930 ft (280 m) section of it is supported by pontoons , and can be moved to allow vessels to pass through.