Transport Atlas

How The World Moves
Infrastructure

Saint Lawrence Seaway

Also Known As Highway H2O

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A system of canals, locks and channels opened in 1959 that lets ocean-going ships travel from the Atlantic Ocean into the Great Lakes as far inland as Duluth, Minnesota, on Lake Superior. It is jointly operated by the St. Lawrence Seaway Management Corporation in Canada and the Great Lakes St. Lawrence Seaway Development Corporation in the United States, marketed together as Highway H2O.

Facts
Completion Year
1959 1
Significance
Carries 40 to 50 million tonnes of cargo a year, roughly half of it bound for international ports in Europe, the Middle East and Africa, opening the interior of North America to deep-draft ocean shipping. 1
Cross-Tradition Connections

Part Of

Sources
1. Wikipedia: Saint Lawrence Seaway
WikipediaHistory
Quote, History
On April 25, 1959, large, deep-draft ocean vessels began streaming to the heart of the North American continent through the seaway.
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1. Wikipedia: Saint Lawrence Seaway
WikipediaExpansion proposal
Quote, Expansion proposal
The seaway locks permit passage of a ship 740 feet (230 m) long by 78 feet (24 m) wide (the Seawaymax limit).
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