What U.S. city dyes its river bright green each year for St. Patrick’s Day?
Each March, the city of Chicago celebrates St. Patrick’s Day by transforming its namesake river into a vibrant, fluorescent green. This world-famous tradition is managed by the local Plumbers Union, who use a motorboat to spread a specialized, vegetable-based dye into the water. While the river initially appears orange when the powder first hits the surface, it quickly reacts with the water to create the iconic emerald glow that lasts for several hours, drawing thousands of spectators to the downtown waterfront.
Source:
https://www.youtube.com/watch?v=ho70z5kmtrk
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