The Tunnel and Reservoir Plan is a large civil engineering project in metropolitan Chicago intended to reduce flooding and limit the harmful effects of flushing raw sewage into Lake Michigan by diverting storm water and sewage into holding reservoirs. Commissioned in the mid 1970s and managed by the Metropolitan Water Reclamation District of Greater Chicago, it ranks among the largest civil engineering projects ever undertaken by scope, cost and timeframe, with more than three billion dollars spent across thirty years of construction and full completion not expected until 2032.
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