Hundreds of people went against a nearly century-long tide to swim in the Chicago River on Sept. 22.

The event, which was put on for ALS research, marked the first open water swim in the river in 98 years, according to A Long Swim , a nonprofit that organized the event.

More than 260 swimmers participated in two races, including a one-mile and two-mile course, in men's and women's divisions. The competition, which was attended by thousands including Mayor Brandon Johnson, raised $150,000 for research for the neurodegenerative condition also known as Lou Gehrig's Disease, according to a news release.

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