In 1933, the US completed a 336-mile waterway across Illinois to carry cargo between the Great Lakes and the Mississippi; decades later, it became a pathway for invasive carp

A flotilla of barges arrived in Chicago from New Orleans on June 22, 1933, and marked the completion of one of America’s largest inland navigation projects. The Illinois Waterway created a continuous shipping route that linked the Great Lakes to the Mississippi River, and allowed cargo to move between the nation’s industrial heartland and the Gulf of Mexico without having to rely on rail.

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