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Forty gallons of green vegetable dye are used to color the Chicago river for the St. Patrick's day celebration.
The Chicago River is dyed green every year for St. Patrick's Day.
The Chicago River is dyed green on St. Patrick's Day in Chicago. This tradition has been taking place since 1962, and it has become an iconic part of the city's celebrations for the holiday.
It's actually blue dye that turns the Chicago River green.
Chicago.
No rivers are green except the Chicago River which is only green for one day in St. Patrick's day because it has been dyed
The Chicago River and San Antonio River are dyed green every St. Patrick's Day.
Chicago river (green river Chicago) gets dyed green every year.
The city dyes the Chicago River green.
The Chicogo River in Chicogo, Illinois and Indianapolis, Indiana's main canal.
The Chicago River.
The Chicago River is dyed green and they have a parade.