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A simple suspension bridge (also rope bridge, swing bridge (in New Zealand), suspended bridge, hanging bridge and catenary bridge) is a primitive type of bridge in which the deck of the bridge lies on two parallel load-bearing cables that are anchored at either end. They have no towers or piers.
A swing bridge (or swing span bridge) is a movable bridge that can be rotated horizontally around a vertical axis. It has as its primary structural support a vertical locating pin and support ring, usually at or near to its center of gravity, about which the swing span (turning span) can then pivot horizontally as shown in the animated illustration to the right.
The City of Toronto government once operated a swing bridge over the Keating Channel at or near Cherry Street. The current bridge, constructed in 1968, is a vehicle and pedestrian bascule bridge, with a metal mesh deck. The original swing bridge was made of wood, and only carried a single rail line, operated by the Grand Trunk Railway.
The second bridge in March 1908, when flooding upriver had caused a log jam to accumulate around it. The swing span is out of frame to the left in this view. The Madison Street Bridge, or Madison Bridge, refers to two different bridges that spanned the Willamette River in Portland, Oregon, from 1891 to 1900 and from 1900 to 1909.
It was opened on December 17, 1959, replacing an earlier swing-bridge that was built 1927. [ 3 ] [ 2 ] The bridge swings on its central pier to open for boat traffic that is too tall to clear the bridge, and has an operator's station in the center of the span from which an attendant can operate the bridge.
Bergen County installed the extant iron swing bridge in 1889 as part of the ongoing replacement of outdated wooden drawbridges, which slowed the passage of ship traffic on the river. A drawbridge only opened one lane of traffic, while a swing bridge opened two, allowing boats to pass simultaneously in both directions.
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