Champlain Bridge, Steel and concrete bridge in Montreal, Canada

The Champlain Bridge was a steel truss cantilever bridge with prestressed concrete approach viaducts, opened in 1962 between Montreal and Brossard. Its main cantilevered span measured 215 meters, and the bridge deck carried six vehicle lanes. The structure rested on concrete piers and included a prestressed concrete deck paved with asphalt.

Announced on 17 August 1955 by federal transport minister George Marler to relieve the Victoria, Jacques-Cartier and Mercier bridges, the Champlain Bridge opened on 28 June 1962 at 4 p.m., with only the Wellington Street approach in place. The Atwater and La Vérendrye approaches followed in December 1964 and the Bonaventure Expressway in April 1967. A $0.25 toll financed its $35 million cost until 1990, and the bridge closed on 28 June 2019, 57 years to the day after opening.

The bridge was named in 1958 after Samuel de Champlain, the explorer who founded Quebec City in 1608; the project had been called the Nuns' Island Bridge. Its opening on 28 June 1962 drew traffic that had previously used the Victoria, Jacques-Cartier and Mercier bridges. A 25-cent toll, or 8 cents with tokens, was charged until 1990.

The bridge carried six lanes, three in each direction; during rush hour one off-island morning lane and one on-island evening lane were reserved for buses running against the flow. Tolls of $0.25 ($0.08 with tokens) were charged until 1990. The structure was demolished after closing on 28 June 2019.

The bridge's concrete deck was replaced in 1992 by an orthotropic steel deck on the cantilever section, and gutters added in 1994 channel corrosive runoff into the river. In November 2013 a crack in a critical part of the superstructure led to lane closures and the emergency installation of a 75-tonne external beam, nicknamed the "super-beam" by the media.