TIME Holidays

Watch the Chicago River Turn Green for St. Patrick’s Day

The river greening tradition dates back 52 years

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For the last 52 years, Chicago has kicked off its St. Patrick’s Day celebrations by dying the Chicago River a bright green. The ceremonial greening of the river took place Saturday morning at 9:30, and YouTuber Peter Tsai posted this awesome 30-second time-lapse video showing the process from start to finish.

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