A movable bridge is a bridge that can changed in shape or position in order to allow large traffic to pass through it. Bridges may also be movable to aid military defence. For details see the articles on particular types of movable bridge at
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A bascule bridge is a drawbridge with a counterweight that continuously balances the span, or "leaf", throughout the entire upward swing in providing clearance for boat traffic.
Although the bascule bridge has been in use since ancient times, it was not until the 1850s that engineers developed the ability to move very long, heavy spans quickly enough for practical application.
Since then, all bridges across Neva and other major rivers in the city (total 21) were bascule, to provide navigation, and not allowing city inhabitants to travel across the river at night (this remained so until 2003 when the first cable-stayed bridge across Neva was open).
The New River Gorge Bridge in West Virginia is the longest arch bridge, spanning a gap of 518 m (1,700 ft).
Movablebridges are generally constructed over waterways where it is either impractical or too costly to build bridges with high enough clearances for water traffic to pass underneath.
The longest swing-bridge span is that of a railroad and highway bridge crossing the Mississippi River at Fort Madison, Iowa.
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