How much did the St. Lawrence Seaway project cost to overcome the drop between Lake Ontario and Montreal?

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Map showing the St. Lawrence hydrographic system and the five main sectors of the St. Lawrence Seaway project, stretching from Lake Ontario near Kingston through various locks, canals, and dams along the Canada-United States border to Montreal. The map highlights key locations such as the Thousand Islands, International Rapids, Lake St. Francis, Soulanges, and Lachine sections, with detailed labeling of major locks, canals, and power dams. Cross sections of the lock and canal system are depicted — St. Lawrence Seaway The St. Lawrence hydrographic system, with the five main sectors of the St. Lawrence Seaway project.

To overcome the navigational hazard of the 69-metre (226-foot) fall of the St. Lawrence River between Lake Ontario and Montreal, and to develop the river's hydroelectric power potential, an investment of more than $1 billion was required.1