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Did You Know!

Chicago Reversed a Whole River—on Purpose

• In 1900, Chicago engineers reversed the flow of the Chicago River to stop sewage from contaminating Lake Michigan, the city’s main source of drinking water.
• They didn’t just redirect a stream — they literally changed the direction a major river flows, sending it away from the lake and toward the Mississippi River basin.
• It was such a massive feat of engineering that it's still considered one of the greatest public health moves in U.S. history — and sparked a lawsuit from Missouri.