description Quebec Bridge Overview
Spanning the St. Lawrence River near Quebec City, the Quebec Bridge uses a steel cantilever-truss structure to carry rail and road traffic. Its main span measures 549 meters, a defining achievement within cantilever bridge engineering. Completed in 1917, the structure demonstrates how projecting truss arms can support a suspended central span across a wide river without placing a support at its midpoint.
Its construction history also includes two catastrophic collapses, making the bridge important to the study of engineering responsibility as well as structural design. Those failures are inseparable from understanding the completed crossing, rather than incidental setbacks in an otherwise straightforward project. The bridge interests civil engineers and railway historians, and provides a visible example of the scale possible with cantilever construction. Its significance combines the reach of the finished structure with the hard lessons of its development.
help Quebec Bridge FAQ
Why is the Quebec Bridge famous in structural engineering history?
The Quebec Bridge is known for its 549 meter main cantilever span, which has long been cited as a world record for cantilever bridges. It is one of the best-known large-span engineering benchmarks in North America.
When was the Quebec Bridge completed and what type of structure is it?
The bridge was built in 1917 and uses a cantilever truss design. It carries both road and rail traffic across the St. Lawrence River.
What is the geographic span of the bridge?
It links sides of the St. Lawrence River near Quebec City in Canada. The span length and mixed-use design make it a major crossing in the region.
Was the Quebec Bridge built as a standard suspension bridge or another type?
It is not a suspension bridge; the defining structure is a cantilever bridge system. That structural choice was key to reaching its long span without a continuous central support.
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