La Fontaine tunnel & Highway 25: road closures for Montrealers this weekend
Posted October 20, 2026 9:51 am.
The Ministère des Transports et de la Mobilité durable informs the public that Highway 25, including the Louis-Hippolyte-La Fontaine tunnel, will be closed toward Montreal during this weekend.
Highway 25 toward the South Shore, including the tunnel, will also be closed at night. These obstructions are required to carry out maintenance work and interventions related to the tunnel’s electrical and communication systems. Repairs to items damaged as a result of incidents and fender benders over the past year will also be carried out.
Westbound Souligny Avenue will also be closed during Friday night to Saturday for an inspection.
Obstructions and traffic management
Highway 25 toward Montreal
- Complete closure of Highway 25 northbound (including the Louis-Hippolyte-La Fontaine tunnel) between exit 90 (Highway 20 West, Route 132, La Prairie, USA, Varennes, P.-E.-Trudeau airport) and the entrance from Sherbrooke Street, from Friday, 10 p.m., to Monday 5 a.m.
- The entrances to this section will be closed 30 minutes before the highway is completely closed.
- The on-ramp from Souligny Avenue eastbound will be open during the day.
Highway 25 toward the South Shore
- Complete night closure of Highway 25 toward the South Shore (including the Louis-Hippolyte-La Fontaine Tunnel) between exit 4 (Montreal [downtown], Jacques-Cartier Bridge) and the entrance from Île Charron, according to the following schedule:
- Friday, 10 p.m., to Saturday, 8 a.m.;
- Saturday, 10 p.m., to Sunday, 9 a.m.;
- Sunday, 10 p.m., to Monday, 5 a.m.
- The entrances to this section will be closed 30 minutes before the highway is completely closed.
- Souligny Avenue eastbound, between Dickson and Honoré-Beaugrand streets, will be closed 30 minutes before the complete closure of Highway 25.
Souligny Avenue westbound
- Complete night closure of Souligny Avenue westbound, between Honoré-Beaugrand Street and Exit 4 of Highway 25 southbound, from Friday 10 p.m. to Saturday 8 a.m.
Work may be postponed due to adverse weather conditions or operational constraints. Before hitting the road, it is recommended that you consult Québec 511, a practical tool for properly planning your trips, and download the Québec 511 mobile application to activate notifications.
