Administration of the Great Lakes-St. Lawrence Seaway System is shared by the GLS and the St. Lawrence Seaway Management Corporation (SLSMC).

The SLSMC is a not-for-profit corporation responsible for the safe and efficient movement of marine traffic through the Canadian Seaway facilities, which consists of 13 of the 15 locks between Montreal and Lake Erie. The Corporation plays a pivotal role in ensuring that the waterway remains a safe and well-managed system, which it shares with the GLS.

The Corporation's mandate promotes efficiency and responsiveness to the needs of shipping interests, ports, marine agencies, and provincial and state jurisdictions.                                                                              

SLSMC Mission Statement

We serve our customers by passing ships through a safe, secure and reliable waterway system in a cost effective, efficient, environmentally and socially responsible manner to deliver value to the North American economy.

SLSMC Vision Statement

The St. Lawrence Seaway Management Corporation and its partners are an essential and responsive transportation system connecting the heartland of North America to the world.