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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 bridge may be stiffened by the addition of cables that do not bear the primary structural or live loads and so may be relatively light. These also add stability in wind. An example is the 220-meter-long (720 ft) bridge across the river Drac at Lac de Monteynard-Avignonet: this bridge has stabilizing cables below and to the side of the deck.
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St. Francis River Bridge (Madison, Arkansas) St. Joseph Swing Bridge; St. Paul Union Pacific Rail Bridge; Sakonnet River rail bridge; Sarto Bridge; Saugatuck River Bridge; Schuylkill Arsenal Railroad Bridge; Snow-Reed Swing Bridge; Spokane Street Bridge; Spuyten Duyvil Bridge; Swing Bridge at New Bridge Landing
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 swing bridge design, in which the center section of the bridge can rotate, allowed a variety of boats to pass by on the swift river. The bridge is the oldest surviving swing bridge of its design in Texas and one of three such bridges in the state. [2] [3] The bridge was added to the National Register of Historic Places on June 8, 2011. [1]
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The harbour bridge, originally beginning as a swing bridge before later being replaced with a in 1972, constantly has to be opened to shipping moving in and out of the inner port - with an estimated 14,000 vehicles using it each day, [7] [8] the regular opening slowly developed regular traffic jams. [9]