The Chicago flood occurred on April 13 , 1992 , when the damaged wall of a utility tunnel beneath the Chicago River opened into a breach which flooded basements and underground facilities throughout the Chicago Loop with an estimated of water .
The Chicago flood happened on April 13 , 1992 . It was caused when the damaged wall of a utility tunnel beneath the Chicago River opened into a breach which flooded basements and underground facilities throughout the Chicago Loop with an estimated 250 e6USgal of water .