Bascule bridge
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A bascule 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-le
The Wells Street Bridge (Chicago), a double-leaf fixed-trunnion bascule bridge
The counterweight is often hidden below the road surface in the bridge abutment.
A rolling-lift bascule bridge in the down position
Joseph Strauss (engineer)
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Joseph Baermann Strauss was an American structural engineer who revolutionized the design of bascule bridges. He was the chief engineer of the Golden Gate Bridge in San Francisco, California.
Bascule bridge
…rotates around a large axle that raises the span(s). The Chicago bascule name derives from the location where it is widely used, and is a refinement by Joseph Strauss of the fixed-trunnion. There are 44 movable bridges in Chicago, however 12 are not in operation. The Jackknife Bascule Bridge in Fort William, Ontario…
The Joseph Strauss Memorial in San Francisco