Saint Lawrence Seaway photograph

Saint Lawrence Seaway

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Length595. 5 km
Maximum height above sea level57017000
Maximum boat length740 ft 0 in (225. 6 m)
Maximum boat beam78 ft 0 in (23. 8 m)
Date completed1959
Did you knowIn 1953, work began on the St. Lawrence Seaway.
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Date of Upd.
ID1262139
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About Saint Lawrence Seaway


The Saint Lawrence Seaway is a system of locks, canals, and channels in Canada and the United States that permits oceangoing vessels to travel from the Atlantic Ocean to the Great Lakes of North America, as far inland as Duluth, Minnesota at the western end of Lake Superior.

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