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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.
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 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]
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 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 ...
The bridge has an annual average daily traffic (AADT) of nearly 50,000 vehicles, including about 2,000 trucks. [2] In 2005, the bridge was raised 80 times to accommodate boats passing underneath. [2] The original span opened in 1930; its replacement opened in 2021.
Two or four hydraulic pillars under the bridge, one or two at each end, raise the bridge deck to allow boat traffic to pass beneath it. [1] In contrast to a lift bridge, where the deck is pulled upwards along towers, the deck of a table bridge is pushed upwards by otherwise hidden pillars. [2]
The bridge is then rolled off where it unfolds automatically. The bridge spans 382 metres, load capacity 20 tons, or 227 m, load capacity 60 tons, with 32 river pontoons, 12 bridging boats and four shore pontoons. [3] The PMP was superseded by the PPS-84 [4] and later the PP-91 bridge system after the breakup of the Soviet Union. The ...