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

Maisonneuve Region
151 Écluse Street
Saint-Lambert, Quebec
Canada  J4R 2V6
Telephone: 450-672-4110
Fax: 450-672-7098
send us a message

Niagara Region
508 Glendale Avenue
St. Catharines, Ontario
Canada  L2R 6V8
Telephone: 905-641-1932
Fax: 905-682-4525
send us a message

Head Office
202 Pitt Street
Cornwall, Ontario
Canada  K6J 3P7
Telephone: 613-932-5170
Fax: 613-932-7286
send us a message