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Photo: Boris Gjenero. The Welland Canal is a strategic link between Lake Ontario and Lake Erie. To accommodate as much traffic as possible and mitigate the delays of going through three consecutive locks, the lock system was divided in two so that ships could be accommodated in both directions. The

Photo: Dr. Jean-Paul Rodrigue, 2009. Lakers are ships specifically designed to go through the St. Lawrence Seaway and thus navigate the Great Lakes (thus their name). The above laker, the CSL Laurentien owned by Canada Steamship Lines, has just entered the St. Lawrence Seaway through the St. Lambert Lock with

The St. Lawrence Seaway is the infrastructural link used for navigation between the St. Lawrence River at Montreal and Lake Erie at the end of the Welland Canal. Downstream, the St. Lawrence River Channel, which is dredged to ensure a control depth of 10.5 meters (35 feet), extends to Quebec

Photo: St. Lawrence Seaway Authority. The primary function of the Iroquois Locks is to adjust the traffic transiting the Seaway to the water level of Lake Ontario. This means that the lift varies between 2 to 6 feet (0.6 and 1.8 meters) depending on the water level.

Source: St. Lawrence Seaway Authority. The Seaway was opened for navigation in 1959. The first ship to cross the St. Lambert Lock in April 1959 was the Frontenac, an icebreaker.

Source: Saint Lawrence Seaway Management Corporation. The construction of locks was a difficult undertaking as in several places the rock foundation proved to be harder than expected. As the St. Lawrence Seaway was nearing completion in late 1958, locks were being flooded for the first time.

Source: Saint Lawrence Seaway Management Corporation. Shown in this picture are Robert H. Saunders of Ontario Hydro (behind the microphones), Canadian Prime Minister Louis St. Laurent (on his left), and Gov. Thomas E. Dewey of New York (left of St. Laurent). On the extreme left, Premier Leslie Frost of Ontario.

Source: adapted from J. Gilmore (1957) “The St. Lawrence River Canals Vessel”, Society of Naval Architects and Marine Engineers, Transactions, 1957, pp. 111-161. The St. Lawrence River, between Montreal and Kingston, is composed of a series of rapids, impending navigation, and fluvial lakes. Prior to 1780, the only way to

The St. Lawrence is part of a complex system, which includes the Great Lakes, the St. Lawrence Seaway, and a dredged channel between Quebec and Montreal. The main purpose of the Seaway is to provide a maritime link between Montreal, an ocean port, and the Great Lakes by using a