@metrouk: The “greening” of the Chicago River is a tradition that goes back to 1962, and was actually born from an effort to clean up the waterway at its most polluted. Stephen Bailey, business manager of the local plumber union, came across a plumber whose normally white overalls were stained green. That plumber was part of a team pouring small amounts of green dye into the sewers to detect where waste was leaking into the river. The encounter with the overalled plumber inspired Bailey, childhood friend of then-mayor Richard J. Daley and chairman of this nascent St. Patrick's Day Parade, to have the Chicago Journeymen Plumbers Local 130 union dump this tracer dye into the Chicago River as part of the holiday celebration. The plumbers’ union still manages the dyeing today. #stpatricksday #stpaddysday #stpattysday #stpatrick #ireland #ireland🇨🇮 #ireland🇨🇮 #chicago #history #fact #interesting #fy