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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

Stretching from Montreal to Lake Superior, the system of locks and canals comprising the St. Lawrence Seaway enables access to the Great Lakes and the American Midwest. It is composed of two systems of locks. The first section links Montreal to Lake Ontario, with the first lock being St. Lambert,

Author: Dr. Jean-Paul Rodrigue The St. Lawrence Seaway is an inland navigation system linking the St. Lawrence River and its oceanic access to the Great Lakes through channels and locks. 1. Rationale and Construction The St. Lawrence Seaway is one of the world’s most comprehensive inland navigation systems, the outcome

Note: The contents of this page (only) have been placed in the public domain. This chart and the related text can be freely used as long as its source is cited. Business cycles are a well-understood concept commonly linked with technological innovations, which often trigger a phase of investment and