The Quebec Ministry of Transport announced that Highway 25 and the Louis‑Hippolyte‑La Fontaine tunnel will be closed from October 9 to October 13, 2026. Drivers are directed to use the Champlain Bridge as an alternate route, with the detour in place from October 9 to October 11.
The shutdown affects the South Shore area of Montreal for five days, while the Champlain Bridge detour will be available for three days during the closure.