Why the Chicago River's flow was reversed during flooding, and where things stand

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Why the Chicago River's flow was reversed during flooding, and where things stand
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As Chicago was inundated with heavy rains on Sunday, the decision was made to reverse the flow of the Chicago River, a rarely-taken step.

, the river’s locks near Wilmette were opened just before 2:30 p.m. Sunday, and were closed just before 10 p.m.

Additional locks on the river near downtown Chicago were opened at approximately 4 p.m. Sunday, and were not closed until 2:30 a.m. Monday, officials said.Feeling out of the loop? We'll catch you up on the Chicago news you need to know. Sign up for the weeklyMost Chicago-area residents know that the flow of the river was reversed in the early 1900’s to help alleviate pollution on Lake Michigan.

Opening the locks is a step that is rarely taken by authorities, and is only done at times when water levels on the river are threatening homes and businesses, In fact, the river’s flow was only reversed once in 2019 and twice in 2020, with zero such reversals in the last two years.

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