It's scheduled for Sept. 21. It will be the first sanctioned swim in the Chicago River in nearly a century.
The event was supposed to happen last year, but organizers were denied a permit and relocated the swim to Lake Michigan.
The city has now already given the green light for this year's event.
Visit www.chicagoriverswim.org for more information. Applications are required and are due by 10 p.m. Monday.