This from Dave Weaver:

4/13/92 The Great Chicago Flood – The Great Chicago Flood was caused by a bridge piling construction project that created a breach in an abandoned coal tunnel beneath the North Branch of the Chicago River that was discovered the morning of Monday, April 13, 1992. This video is a compilation of video from Dave Weaver and other WGN TV News photographers.

Tags: 4/13/92 Great Chicago Flood, anniversary of the great chicago flood, Dave Weaver