CHICAGO (CBS)– Dozens of people jumped into the Chicago River Saturday morning, to show just how clean it is.

Congressman Chuy Garcia and Cook County Board President Toni Preckwinkle plan to take the jump.

READ MORE: 2 Mass Shootings Reported At The Same Time In Chicago Hours After President Biden Announces Plan To Address City's Violence

READ MORE: Police Searching For Four Suspects After Man Carjacked In River North

The event took place at 9 a.m.

It’s part of the Chicago River Revival Festival, in Chinatown. The event marks 40 years, since the founding of the non-profit “Friends of The Chicago River.”

MORE NEWS: Cook County Nurses Set To Strike Thursday Over Staffing Issues