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Aerial photo of Soo Locks, a vital waterway for iron ore and other maritime commerce between Lake Superior and Lake Huron that first opened in 1855. Today, only two of its four locks are operable, and only one the Poe Lock can handle the largest lake freighters. Image courtesy of U.S. Army Corps of Engineers.

Aerial photo of Soo Locks, a vital waterway for iron ore and other maritime commerce between Lake Superior and Lake Huron that first opened in 1855. Today, only two of its four locks are operable, and only one the Poe Lock can handle the largest lake freighters. Image courtesy of U.S. Army Corps of Engineers.

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