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Contact the GLS

Great Lakes St. Lawrence Seaway Development Corporation (GLS)
 
Headquarters
U.S. Department of Transportation
1200 New Jersey Ave, SE W74-119
Washington, DC 20590
United States
 
Operations
180 Andrews Street
Massena, NY 13662
United States
 

GLS@dot.gov

Headquarters Phone: 202-366-0091
Operations Phone: 315-764-3200
Alt: 800-785-2779
Fax: 202-366-7147
 
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Seaway Visitor Center on Facebook
Great Lakes - St. Lawrence Seaway
Hwy H2O
 
Business Hours:
8:00am-5:00 pm ET, M-F
Last updated: Friday, October 3, 2025