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 11 to watch the event for the city’s 2023 St. Patrick's Day celebration.

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

• Dyeing the Chicago River Green is a St. Patrick's Day Tradition. How Did It Start?, NPR
• Chicago River goes green for St. Patrick's Day!, ABC7 Chicago 
• Chicago Plumber’s Union in Charge of Dyeing Chicago River Green on St. Patrick’s Day, PHCPPros