Did you know? The Chicago Journeymen Plumbers Local Union 130 UA has carried out the task of dyeing the Chicago River green for St. Patrick’s Day nearly every year since 1962. Chicagoans returned downtown on March 12 to watch the event for the city’s first large St. Patrick's Day celebration since the start of the COVID-19 pandemic.

You can learn more about this year's river-dyeing festivities and how the tradition started in the articles below: 

• Crowds Return to the Chicago River as City Goes Green for St. Pat’s, Chicago Sun-Times
• Dyeing the Chicago River Green is a St. Patrick's Day Tradition. How Did It Start?, NPR
• How and Why Chicago Turns Its River Green for St. Patrick's Day, Travel + Leisure
• Chicago Plumber’s Union in Charge of Dyeing Chicago River Green on St. Patrick’s Day​, PHCPPros