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Saint Lawrence Seaway Development Corporation

The Saint Lawrence Seaway Development Corporation works to operate and maintain a safe, reliable, efficient waterway between the Great Lakes and the Atlantic Ocean.

Phone number

  • 1-202-366-0091
  • 1-315-764-3200 (Operations)

Toll-free number

1-800-785-2779

Main address

1200 New Jersey Ave., SE
Suite W32-300
Washington, DC 20590
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