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#1 Federal
Great Lakes St. Lawrence Seaway Vessel Transits
- Organization: Department of Transportation
- Dataset Last Updated: February 11, 2026
The Great Lakes St. Lawrence Seaway’s navigation season generally begins in late March and closes in late December. Opening and closing dates vary from year to year.

Search relevance: 1.00 | Views last month: 3 | Catalog Last Checked: August 02, 2026 at 11:25 PM

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