Chicago was growing by leaps and bounds throughout the 19th century. The frontier town quickly grew into the largest metropolis in the Midwest. But as Chicago’s profile and population grew, a hidden killer was taking lives. Sewage and waste was being dumped into the Chicago River and polluting Lake Michigan, the source of the city’s drinking water. Officials were left with no other option but to embark on a daring design to reshape part of the natural world – and reverse the flow of the Chicago River.

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