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The Louis Hippolyte Lafontaine Bridge-Tunnel (Pont-Tunnel Louis-Hippolyte-La Fontaine) is a Canadian highway bridge-tunnel running over and beneath the St. Lawrence River. It connects the Island of Montreal with the south shore of the river at Longueuil, Quebec.
Construction began in 1963 and it was commissioned on March 11, 1967. Named for the respected Lower Canada political reformer Louis-Hippolyte Lafontaine, the Lafontaine Tunnel is an immersed tube structure, measuring 1,391 m (4562 ft) long. It carries the Autoroute 25 expressway and passes beneath Île Charron (Îles de Boucherville & entrance/exit #1 of Autoroute 25), as well as the main shipping channel in the St. Lawrence River immediately downstream from the St. Lawrence Seaway.
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