Certain requirements must be met by ships greater than 222.5 metres
1. Ships must have a rounded sterm bar.
2. Ships must be equipped with adequately powered
self-tensioning and self-rendering winches and fairleads at an
3. Adding to the O.A.L. will somewhat decrease
existing margins with respect to distances to and from ship
arresters. Locking of these larger ships will require special
These will increase the lockage time by 2 to 3 minutes.
4. Mariners must comply with special mooring
instructions and procedures when proceeding through the locks.
As water levels, changes in seasonal conditions and ship design can
hae an impact on the ability of Seaway locks to accommodate ships
with larger dimensions, special consideration must be given in
certain cases to ensure a safe and efficient transit for all users.
Prior review and approval of ship plans are necessary for all ships
in excess of the current maximum dimensions before permission to
transit will be granted.
For further information regarding transit of ships with dimensions in
excess of the current maximum permissible dimensions, please direct
Director, Marine and Operational Services
The St. Lawrence Seaway Management Corporation
202 Pitt Street
CANADA K6J 3P7
Telephone No.: (613) 932-5170, Extension 3211
Facsimile No.: (613) 932-5204