CHICAGO (FOX 32 NEWS) - The Chicago River will be dyed a bright shade of emerald green on Saturday, kicking off the city's St. Patrick's Day festivities.
Thousands of people will line the riverfront downtown to see the dyeing, a tradition for the holiday that dates to 1962.
The Chicago Plumbers Union started the tradition of dyeing the river green, with a material once used to locate leaks in buildings. Organizers say the powder used is a secret recipe and is environmentally safe.
The Associated Press contributed to this story.