Saint Lawrence Seaway Development Corporation (GLS)
The Saint Lawrence Seaway Development Corporation (GLS) works to operate and maintain a safe, reliable, efficient waterway between the Great Lakes and the Atlantic Ocean.
Phone number
1-202-366-0091
Toll-free number
1-800-785-2779
Main address
1200 New Jersey Ave., SEWashington, DC 20590
Have a question?
Ask a real person any government-related question for free. They will get you the answer or let you know where to find it.