The river may no longer be dyed green, but St. Patrick's Day in Chicago is officially here.
Last week, the Chicago plumbers union carried on their decades-long tradition of dyeing the Chicago River green using a mysterious recipe that may or may not require the help of some lucky Leprechauns.
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According to officials the river only remains green for several hours. But you can relive the transformation in the time-lapse above.
If you are still hoping to get into the St. Patrick's Day spirit this chilly weekend, the family-friendly "Shake Your Shamrock" event in Norwood is slated for Saturday.
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