Louis-Hippolyte Lafontaine Bridge–Tunnel

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Louis-Hippolyte Lafontaine Bridge–Tunnel (bridge part)
Louis H Lafontaine Tunnel.JPG
Carries Autoroute 25
Crosses Saint Lawrence River
Named for

Louis-Hippolyte La Fontaine

Further information
Total length 409 m (1,341.9 ft)
Width 37 m (121.4 ft)
Height {?}
Clearance above 4.4 m (14 ft 5 14 in)
Clearance below 8 m (26.2 ft) (?)
No. of lanes 6
Construction cost C$75 million
Opened March 11, 1967
Daily traffic 120,000
Louis-Hippolyte Lafontaine Bridge–Tunnel (tunnel part)
Inside the tunnel. One of the three lanes is shown to be reversible.
Route Autoroute 25
Crosses Saint Lawrence River
Start Montreal Island

Île Charron (Îles de Boucherville)

Further information
Character Limited access highway
Length 1,391 m (4,563.6 ft)
No. of lanes 6
Tunnel clearance 4.4 m (14 ft 5 14 in)
Width 37 m (121.4 ft)
Depth of tunnel below water level To come
Depth of shipping channel above To come

The Louis-Hippolyte Lafontaine Bridge–Tunnel (Pont-Tunnel Louis-Hippolyte-La Fontaine) is a Canadian highway bridge–tunnel running over and beneath the Saint Lawrence River. It connects the Island of Montreal with the south shore of the river at Longueuil, Quebec.

Construction began in 1963 and it opened 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 (4,563.6 ft) long. It carries the Autoroute 25 expressway and passes beneath the main shipping channel in the Saint. Lawrence River immediately downstream from the Saint Lawrence Seaway. It surfaces on Île Charron (Îles de Boucherville at entrance/exit #1 of Autoroute 25), then continues by bridge to Longueuil.

Each section weighs 32,000 t (31,000 long tons; 35,000 short tons), is 110 metres (360 ft) long, 37 metres (121 ft) wide and rises to a height of 8 metres (26 ft). In total, the bridge–tunnel is 1.8 kilometres (1.1 mi) long. It is estimated that 44 million vehicles drive through it per year, or 120,000 per day. The tunnel was built with sections prefabricated in dry dock and then sunk in the river, 24 metres (79 ft) below the surface of the water. It is one of the largest prestressed concrete structures in the world.


In 1960, the construction of the Trans-Canada Highway (TCH) through Quebec from the Ontario border to Rivière-du-Loup was announced. In Montreal, to avoid having to build a huge bridge that would have disfigured the city and destroyed a neighbourhood, the engineers opted for the construction of a tunnel located under the Saint Lawrence River, and dug a trench under the river bed and buried the tunnel sections 4.6 metres (15 ft) to 6.1 metres (20 ft) under the river bed. The construction was completed in March 1967, just before the opening of Expo 67. Construction cost $75 million.

It bears the name of Louis-Hippolyte La Fontaine, a politician born in 1807 in Boucherville.

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Coordinates: 45°34′46″N 73°28′46″W / 45.57944°N 73.47944°W / 45.57944; -73.47944