Transport Quebec announced that the Louis‑Hippolyte‑La Fontaine tunnel, part of Highway 25 in Montreal, will be closed on the night of Friday, September 18, 2026. The shutdown is intended to allow crews to work on the tunnel’s electrical and communication systems and to repair damaged components.
The closure will take place overnight, affecting traffic that normally uses the tunnel to cross the river. Motorists are being asked to plan their journeys accordingly and to use alternate routes while the work is carried out. No specific reopening time was provided, but the timing is set to minimise disruption before the weekend.
Transport officials said the work is part of scheduled maintenance aimed at preserving the reliability of the tunnel’s critical infrastructure. Maintaining the electrical and communication networks is essential for safe operation, and repairing any damaged elements helps prevent larger failures.
The Louis‑Hippolyte‑La Fontaine tunnel is a key segment of Highway 25, linking several boroughs of Montreal and serving a high volume of commuters and commercial traffic. Regular upkeep of the tunnel ensures that it continues to function as an integral component of the province’s road network, especially ahead of peak travel periods.
Residents and commuters will receive updates through Transport Quebec’s usual communication channels as the work progresses. The agency emphasized that the overnight schedule was chosen to limit the impact on daily traffic flows and to complete the necessary repairs before the weekend rush.