The Quebec Bridge is a riveted steel truss structure and is 987 m (3,239 ft) long, 29 m (94 ft) wide, and 104 m (340 ft) high. Cantilever arms 177 m (580 ft) long support a 195 m (640 ft) central structure, for a total span of 549 m (1800 ft), still the longest cantilever bridge span in the world (it was the all-categories longest span in the world until the Ambassador Bridge was completed in 1929). It is the easternmost (farthest downstream) complete crossing of the Saint Lawrence.
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The Quebec Bridge was designated a National Historic Site of Canada in 1995.
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