The Ministry of Transport and Sustainable Mobility announced that Highway 25 and the Louis‑Hippolyte‑La Fontaine tunnel will be shut from October 9 to October 13, 2026. Motorists are instructed to use the Champlain Bridge as an alternate route, with the detour in effect from October 9 through October 11.
The closure is scheduled for the long‑weekend period on the South Shore of Montreal, requiring drivers to follow the prescribed detour until the tunnel reopens on October 13.