Chicago River is dyed green to celebrate St. Patrick's Day
LISTEN: Partnership between plumbers union, boat tour turns Chicago River green for St. Patrick's Day - Medill Reports Chicago
Most St. Patrick's Day Parades Canceled in Blow for Retail Areas; Cities Still Try to Celebrate
Chicago River dyed green for St. Patrick's Day
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Why does the city of Chicago dye its river green? How long does the color last? - AS USA
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St Patrick's Day, Hydrology & Dyeing the Chicago River Green - Aquatic Informatics