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Great Lakes Saint Lawrence Seaway Development Corporation

55 M Street SE., Suite 930, Washington, DC 20003.


Departmental Postal Address: Great Lakes Saint Lawrence Seaway Development Corporation, 1200 New Jersey Avenue SE., Washington, DC 20590.


Postal and Physical Address: Great Lakes Saint Lawrence Seaway Development Corporation–Operations, 180 Andrews Street, Massena, NY 13662



Deputy AdministratorCraig H. Middlebrook


Associate Administrator, Seaway OperationsGary Croot

The above list of key personnel was updated 03–2021.

The above list of key personnel was updated 03–2021.

The Great Lakes Saint Lawrence Seaway Development Corporation (GLSLSDC) was established by the Saint Lawrence Seaway Act of May 13, 1954 (33 U.S.C. 981-990) and became an operating administration of the DOT in 1966.

The GLSLSDC, working jointly with the Saint Lawrence Seaway Management Corporation (SLSMC) of Canada, operates and maintains a safe, reliable, and efficient deep draft waterway between the Great Lakes and the Atlantic Ocean. It ensures the safe transit of commercial and noncommercial vessels through the two U.S. locks and the navigation channels of the Saint Lawrence Seaway System and engages in economic and trade development activities to stimulate trade and employment in the eight States of the Great Lakes region. The GLSLSDC and SLSMC work together on all matters related to rules and regulations, overall operations, vessel inspections, traffic control, navigation aids, safety, operating dates, and trade development programs.

The Great Lakes-Saint Lawrence Seaway System extends from the Atlantic Ocean to the Lake Superior ports of Duluth and Superior, a distance of 2,342 miles. The Corporation's main customers are vessel owners and operators, Midwest States and Canadian Provinces, Great Lakes port communities, shippers and receivers of domestic and international cargo, and the maritime and related service industries of the Great Lakes and Saint Lawrence Seaway systems.

Sources of Information

Career Opportunities

The GLSLSDC relies on professionals with expertise in administration, engineering, information technology, management, marine operations, public policy, and other fields.

Contact Information

Information for contacting the GLSLSDC by email, postal mail, and phone is posted online.

Freedom of Information Act (FOIA)

Any person has the right to a copy of certain records possessed by the Government's executive administrations, agencies, boards, commissions, corporations, offices, and services. Some records, however, are protected from disclosure.


The GLSLSDC has an easy-to-use Federal grants toolkit that offers a snapshot of the essential information, resources, and tools needed to identify Federal agencies and processes offering financial assistance to maritime stakeholders seeking to carry out environmental, infrastructural, intermodal, and other development projects.


An interactive map of vessels transiting the Great Lakes-St. Lawrence Seaway System is available online.


The SLSDC's quarterly newsletter "Seaway Compass" is available online. It features current information and recent news on the Great Lakes-St. Lawrence Seaway System.


The "Great Lakes-St. Lawrence Seaway System Directory" is a comprehensive publication on the ports and shipping-related businesses that are critical throughout the region and beyond. It features extensive photography and serves as an excellent resource for readers who are interested in the Great Lakes Seaway maritime industry.

The GLSLSDC's marketing brochure offers comprehensive information on the waterway and its significance to the Great Lakes region. It is available online in Portable Document Format (PDF).


The GLSLSDC posts annual reports on its website.

The GLSLSDC posts Asset Renewal Program reports on its website.

Social Media

The GLSLSDC maintains a Facebook account.


The "Environmental and Social Impacts of Marine Transport in the Great Lakes-St. Lawrence Seaway Region" study provides marine stakeholders, transportation planners, and government policymakers with an assessment of the potential environmental and social consequences that could occur if cargo carried by marine vessels on the Seaway navigation system shifted to rail and road modes of transport.

Visitors' Center

The Seaway Visitors' Center at the Eisenhower Lock provides tourists and ship watchers with an observation deck where they can view commercial vessels and cruise ships transiting the lock. Each year, hundreds of ships from all over the globe make thousands of transits through the St. Lawrence Seaway. They carry a wide variety of cargoes: coal, grains, iron ore, steel, steel slabs, stone, and more.

The Sources of Information were updated 3–2021.