Highway 25 tunnel closes Friday night as tunnel ceiling work continues
Complete closure between Sherbrooke and Highway 132 Friday 11 p.m. to Saturday 8 a.m.; alternate routes and truck heights noted.
Sources · Quebec Nouvelles
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Highway 25's Louis-Hippolyte-Lafontaine tunnel will close completely in the southbound direction Friday, Oct. 18, at 11 p.m. through Saturday, Oct. 19, at 8 a.m. for continuing maintenance work.
The closure is between the Sherbrooke Street exit in Montreal and Highway 132 in Longueuil. Drivers should take Dickson Street south and Notre-Dame Avenue to Papineau Avenue and the Jacques-Cartier Bridge. Trucks over a certain height should use Dickson north and Hochelaga, Boulevard de l'Assomption, Sherbrooke and Boulevard Pie-IX south.
Mobilité Montréal recommends a safety margin for the tunnel. Northbound closure of the same tunnel runs the same hours (Friday 11 p.m. to Saturday 8 a.m.), affecting travel from Highway 132 west on the A-20 in Longueuil. Avenue Souligny East closes from Friday 10:30 p.m., with detours via Hochelaga or Notre-Dame.
Also this weekend: the Honoré-Mercier Bridge will shift to contraflow (one lane per direction) Saturday 3 a.m. through Monday 5 a.m. heading toward Kahnawake.
The facts
When does Highway 25's Louis-Hippolyte-Lafontaine tunnel close southbound?
The tunnel closes completely in the southbound direction from Friday, October 16, 2026, at 11 p.m. through Saturday, October 17, 2026, at 8 a.m.
What alternate route should drivers use during the southbound closure?
Drivers should take Dickson Street south and Notre-Dame Avenue to Papineau Avenue and the Jacques-Cartier Bridge.
When does the northbound tunnel close?
The northbound direction closes from Friday, October 16, 2026, at 11 p.m. to Saturday, October 17, 2026, at 8 a.m.
What other structure changes this weekend?
The Honoré-Mercier Bridge will shift to contraflow (one lane per direction) from Saturday, October 17, 2026, at 3 a.m. through Monday, October 19, 2026, at 5 a.m.
Ongoing coverage · La Fontaine Tunnel Closures and Repairs
