Britannica Sources used in this answer

Where does grain shipped through the St. Lawrence Seaway come from?

Created from Britannica articles using AI. AI can make mistakes, so verify using Britannica articles.

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.

Grain shipped through the St. Lawrence Seaway originates from farms located on Canada’s prairies and in the American Midwest. This grain represents the largest commodity moved through the waterway, often transported by lakers from the western Great Lakes to reach world markets.12