Contact Us
Great Lakes St. Lawrence Seaway Development Corporation (GLS)
Headquarters
U.S. Department of Transportation
1200 New Jersey Ave, SE
Washington, DC 20590
United States
United States
Operations
180 Andrews St.
Massena, NY 13662
United States
Headquarters Phone: 202-366-0091
Operations Phone: 315-764-3200
Alt: 800-785-2779
Fax: 202-366-7147
Business Hours:
8:00am-5:00 pm ET, M-F
8:00am-5:00 pm ET, M-F
Last updated: Friday, January 24, 2025