The O’Brien plant opened in October 1928. At the time, it was the largest sewage treatment facility in the world. Nearly a century later, it still serves over 1.3 million people across 143 square miles.

A comprehensive flood mitigation project that officials say will add 4.5 million gallons of floodwater storage capacity for Crestwood and Midlothian was presented to residents.

Board meetings are open to the public and can be streamed online.

Board meetings are open to the public and can be streamed online.

The event is part of Chicago River Day, an annual, region-wide initiative to protect and restore local waterways.