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Why was the first canal around Niagara Falls important for Great Lakes navigation?

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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.

The first canal around Niagara Falls—known as the Welland Canal—was essential to Great Lakes navigation because it provided a bypass for the Niagara River, which is otherwise impassable due to its steep gradient, rapids, and the falls themselves.12

By overcoming the 100-metre (327-foot) difference in elevation between Lake Erie and Lake Ontario, the canal created a vital link that allowed vessels to travel between the two lakes. Opened in 1829, this infrastructure was a foundational step in realizing the dream of a navigable waterway into the North American interior, eventually becoming a key component of the St. Lawrence Seaway.1342