The Chicago River Flows Green: A St. Patrick’s Day Tradition
Every year, a spectacular sight unfolds in the heart of Chicago: the dyeing of the Chicago River a brilliant shade of green. This beloved tradition, now in its 64th year, marks the arrival of St. Patrick’s Day and draws thousands of onlookers to the downtown area.
A History Rooted in Plumbing and Celebration
The tradition began in 1962, thanks to Stephen Bailey, the business manager of Journeymen Plumbers Local Union 130. He had a clever idea: using the vegetable-based dye already employed to detect leaks in buildings as a festive way to celebrate St. Patrick’s Day. What started as a simple concept quickly blossomed into a city-wide spectacle.
On Saturday morning, members of the Plumbers Union initiated the process at 9:52 a.m., releasing their proprietary dye blend into the river between Columbus Drive and Orleans Street. The effect isn’t instantaneous, but gradually transforms the murky water into a vibrant emerald hue, a sight that lasts for several days.
The Science Behind the Green
Despite its magical appearance, the process is surprisingly straightforward. Approximately 40 pounds of powdered dye are distributed from motorboats and sprayed into the river via hoses on Architecture Tours boats. Additional vessels follow, stirring the water to ensure the dye spreads evenly, creating the iconic green flow.
A Symbol of Chicago
The green river has become a globally recognized symbol of Chicago, frequently featured in television shows, movies, and countless social media posts. It’s a testament to the city’s unique blend of tradition, innovation, and community spirit.
Thousands gathered along Columbus Drive and the riverbanks to witness the event firsthand, creating a lively and festive atmosphere. The tradition continues to evolve, but its core remains the same: a vibrant celebration of St. Patrick’s Day and a unique expression of Chicago’s identity.
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