Tag Archives: Deep Tunnel

Part of Chicago’s deep tunnel system, 350 feet underground. The megaproject is one of the largest civil engineering projects ever undertaken in terms of scope, cost and timeframe.

Billed as an engineering marvel and national model, Chicago’s Deep Tunnel was designed to protect Lake Michigan from sewage overflows and put an end to the once-frequent practice of dumping human and industrial waste into local rivers. But nearly four decades after taxpayers started paying for one of the nation’s …