The St. Lawrence Seaway Management Corporation has three facilities along the waterway.

Maisonneuve Region
151 Écluse Street
Saint-Lambert, Quebec
Canada J4R 2V6

Niagara Region
508 Glendale Avenue
St. Catharines, Ontario
Canada L2R 6V8

Head Office
202 Pitt Street
Cornwall, Ontario
Canada K6J 3P7