Transport Quebec announced that the Louis-Hippolyte-La Fontaine tunnel on Highway 25 will be closed on the night of Friday, September 18, 2026. The shutdown is intended to allow maintenance crews to work on the tunnel's electrical and communication systems and to repair damaged components. The closure will take place overnight, minimizing disruption to daytime traffic.
The tunnel closure is part of a broader schedule of overnight shutdowns affecting Highway 25 and adjacent routes in the days leading up to the weekend. Transport Quebec has organized these temporary closures to provide sufficient time for the necessary work to be completed safely and efficiently. Motorists are advised to plan alternate routes during the evening hours when the tunnel will be inaccessible.
The maintenance effort focuses on updating and restoring key infrastructure that supports tunnel operations, including power supply and communication networks. By addressing these systems and repairing any identified damage, Transport Quebec aims to ensure the continued reliability and safety of the tunnel for future users. The agency expects the work to be finished within the designated overnight window, after which normal traffic flow will resume.