October 22, 2025
Seaway announces closing dates of 2025 navigation season
The St. Lawrence Seaway Management Corporation announced the projected closing dates for the 2025 navigation season. In doing so the Seaway Corporations are confirming the closing dates of the 2025-26 navigation season that were communicated in Seaway Notice No.2 of 2025.
Montreal-Lake Ontario Section
• The Corporations have decided to waive the operational surcharges on December 21, 22, 23 and 24.
• Any transit of the Montreal-Lake Ontario Section of the Seaway after 23:59 hours, December 24, if permitted, will be subject to prior written agreement. Arrangements are to be made at the St. Lambert office.
• All ships must be clear of the MLO Section by 12:00 January 5, 2026.
Welland Canal
• Any transits of the Welland Canal after 23:59 hours, December 26, if permitted, will be subject to prior written agreement. Arrangements are to be made at the St. Catharines office.
• All ships must be clear of the Welland Canal by 12:00 January 10, 2026
Sault Ste. Marie Locks and Canal (United States)
Closing of the Sault Ste. Marie Locks (U.S.A.) is currently scheduled for January 15, 2026. Please note the Notice to Navigation Interests released by the US Army Corps of Engineers for further information.
Ports East of Montreal
Ship owners and operators are advised that there are a number of ports east of the Seaway (St. Lambert Lock) on the St. Lawrence River that remain open to navigation during the winter months.
Link: Detailed Closing Procedures