Major traffic disruptions expected in Greater Montreal this weekend
Posted June 19, 2026 8:25 am.
Last Updated June 19, 2026 8:42 am.
Quebec’s Ministry of Transport and Sustainable Mobility advises road users that major obstructions are expected over the weekend.
Highway 138 / Mercier Bridge
From Friday at 11:59 p.m. to Monday at 5:00 a.m.
- Between Montreal and Saint-Lambert, on R-112 East: closure of the lane heading toward the South Shore (upstream bridge). Traffic heading toward Montreal only
Detour: via the Jacques-Cartier or Samuel-De Champlain bridges.
Victoria Bridge, Highway 112
From Saturday at 3 a.m. to Monday at 5:00 a.m.
- Between Montreal and Kahnawake, partial closure of 1 of 2 lanes on the Honoré-Mercier Bridge (R-138 West) at the superstructure level.
Ville-Marie and Viger Tunnels / Highway 136
From Friday at 8 p.m. to Monday at 5 a.m.
- In Montreal, on R-136 East, complete closure of access from Notre-Dame Street / de la Cathédrale Street and A-10 West (Bonaventure) / Robert-Bourassa Boulevard.
Detours:
o Access from Notre-Dame Street West and the Cathedral: via Peel Street and Saint-Antoine Street East. For trucks: via Peel Street and Saint-Antoine Street West, Montagne Sud, Notre-Dame Street East, Robert-Bourassa Boulevard, and Saint-Antoine Street East.
o Access from Notre-Dame Street East and Robert-Bourassa Boulevard: via Saint-Antoine Street East.
Water main inspection and maintenance work, under the responsibility of the City of Montreal.
Saint-Patrick and Bridge Streets
• In Montreal (Le Sud-Ouest borough), the intersection of Saint-Patrick and Bridge Streets will be completely closed from 6 a.m. on Saturday to 8 p.m. on Sunday for work by Hydro-Québec
Mont-Royal: Cavendish Boulevard
From Friday at 10:00 p.m. to Monday at 5:00 a.m.
• In Mont-Royal, Cavendish Boulevard will be completely closed to northbound traffic at the intersection with Dalton Road (southbound) for work by Hydro-Québec work on the municipal utility network.
Detours:
o From Dalton Road heading north: via Côte-de-Liesse East Road, Authier Street, and the A-40 West service road,
o From the A-520 East, via Exit 5 (Hickmore Street), Merizzi, McArthur, and Griffith Streets.
o Toward A-520 East: via Dalton Road northbound and Côte-de-Liesse East Road.
Laval: Highway148 / Des Bois Avenue / Montée Champagne
From Friday at 8:00 p.m. to Sunday at 6:00 p.m.
• In Laval, on R-148 (Avenue des Bois) heading west, the left-turn lane will be closed at the intersection with Montée Champagne.
Detour: Continue on R-148 west, Principale Street, De l’Hôtel-de-Ville Avenue, Saint-Martin Boulevard, and Montée Champagne.
• In Laval, on R-148 (Avenue des Bois) heading east, the right-turn lane will be closed at the intersection with Montée Champagne.
Detour: Take the ramp to A-13 south, continue on the service road, take the ramp to Saint-Martin Boulevard heading west, and then Montée Champagne.
Note: Montée Champagne will be completely closed in both directions at the R-148 / Des Bois Avenue intersection during the same hours. Follow the detour described above.
Traffic Detour on the A-13 South in Laval, Starting June 19
• Starting June 19, reconstruction work on a section of Highway 13 southbound between Dagenais Boulevard West and the A-440 (Jean-Noël-Lavoie) in Laval will result in traffic detours and dynamic lane management for several weeks, continuing through the fall. See the press release.
Extended full closures of a section of R-340 (Boulevard de la Cité-des-Jeunes) and an A-30 West ramp in Vaudreuil-Dorion
• A construction phase change will result in the complete closure, from June 19 through the end of August, of a section of Boulevard de la Cité-des-Jeunes (R-340) and an on-ramp to the A-30 West (de l’Acier), at the intersection with the R-340 in Vaudreuil-Dorion. This closure is necessary to construct a roundabout at the intersection of R 340 and Boulevard de la Gare.
Saint-Eustache: 25th Avenue and Highway 640
From Friday at 8:00 p.m. to Sunday at 6:00 p.m.
• In Saint-Eustache, on 25th Avenue, at the A-640 overpass, the road will be completely closed in both directions.
Detours:
o Heading SOUTH: Take the A-640 West ramp and make a U-turn at Exit 11 (R-148, Arthur-Sauvé Blvd.).
o Heading NORTH: via the on-ramps for A-640 East and A-13 South, make a U-turn at Exit 20, via R-344 (Ch. de la Grande-Côte), take the on-ramp for A-640 West, and take Exit 14 to 25th Avenue.
From Saturday at 6 a.m. to Sunday at 11 p.m.
• In Saint-Eustache, on the A-640 in both directions, partial closure of one of every two lanes at the 25th Avenue overpass
Highway 30 / De L’Acier
Sunday, from 6 a.m. to 8 p.m.
• In Beauharnois, on A-30 East (de l’Acier), between R-236 (Boulevard de l’Énergie) and Chemin Saint-Louis, partial closure of one of every two lanes at the Saint-Louis River bridge.
