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Published on Nov 24, 2009
On October 3, 1986, a heavy thunderstorm drenched the southern portion of the Deep Tunnel area with several inches of rain in a short period of time. While the Deep Tunnel system performed satisfactorily by absorbing excess water, water within the system itself rushed past the north side of Chicago and near the Bahá'í Temple in Wilmette. Geysers of over 65 feet (20 m) were reported in both locations for up to an hour as the water was redistributed more evenly through the system. A 30 ft (9 m) geyser erupted downtown at the corner of Jefferson and Monroe. A system of watertight bulkheads has since been installed to prevent the event from occurring again. (Wikipedia)
Submitters notes: I found this video for a project on the History of Chicago's Waste Water Management projects. The original link is down, if you own this video and want it removed please contact me, thank you.