description Lafontaine Tunnel Overview
The Lafontaine Tunnel, formally known as the Louis-Hippolyte Lafontaine Tunnel, is a major immersed-tube infrastructure crossing the St. Lawrence River in Quebec, Canada. Completed in 1967, it connects the island of Montreal to the south shore suburbs via Autoroute 25. The tunnel was engineered using prefabricated concrete sections that were floated into position and submerged into a prepared trench.
It remains one of the largest subaqueous road tunnels in North America, handling substantial daily commercial and commuter traffic.
help Lafontaine Tunnel FAQ
What does the Lafontaine Tunnel connect?
The Louis-Hippolyte Lafontaine Tunnel carries Autoroute 25 beneath the St. Lawrence River between Montreal and the south shore. It connects the island of Montreal with Île Charron and the Longueuil-area road network.
When did the Lafontaine Tunnel open?
The tunnel was inaugurated in 1967, shortly before Montreal hosted Expo 67. It remains part of the Autoroute 25 bridge-tunnel crossing.
Is the Lafontaine Tunnel an immersed-tube tunnel?
Yes. It was built as an immersed-tube structure, with prefabricated tunnel sections placed beneath the St. Lawrence River. The crossing is combined with a bridge section on the south-shore approach.
How long is the Louis-Hippolyte Lafontaine Tunnel?
The tunnel portion is approximately 1.4 kilometers long, commonly reported as about 1,391 meters. The full Autoroute 25 crossing is longer because it includes the tunnel and the bridge over the river channel.
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