Chicago River Swim Cancelled Due to Storms and Sewer Overflow Risks

Key points

• The Chicago River Swim organization cancelled the event at 4 a.m. Sunday after monitoring weather conditions overnight.
• The cancellation was due to heavy rainfall, lightning risks, and the potential for combined sewer overflows (CSOs) that could compromise water quality.
• The event, which features one- and two-mile swims, was the second in its history; the inaugural 2025 event drew 263 swimmers.
• Organizers announced they will still donate $100,000 to Northwestern University for ALS research and $62,500 to the USA Swimming Foundation for youth swim lessons.
• Participants were invited to gather at the Chicago Brewhouse on the riverwalk for a community meeting from 10:30 a.m. to 1:30 p.m.

Background

The Chicago River Swim is a relatively new event, with its inaugural edition in 2025 marking the first organized open-water swim in the river in 98 years. The 2026 edition expanded participation from 500 to 750 swimmers and included a 'Big Jump' event on Friday, which proceeded as planned. The city had issued flood watches and severe storm warnings for the weekend, with heavy rainfall expected through early Sunday.

How outlets are covering it

Block Club Chicago and CBS News both reported the cancellation based on a joint statement from the organizers and the City of Chicago, emphasizing the safety concerns related to CSOs and lightning. NBC 5 Chicago focused on the broader impact of the weather, noting that other events like the Chicago Live Festival moved indoors and Riot Fest ended early. All sources agreed on the charitable donations being made despite the cancellation, with CBS News highlighting the specific amounts and recipients.

Why it matters

The cancellation highlights the vulnerability of large-scale public events to extreme weather and infrastructure challenges like combined sewer overflows. It also demonstrates the organizers' commitment to their charitable goals, ensuring that funds raised for ALS research and youth swim education are still delivered despite the event not taking place.

What to watch

The next Chicago River Swim is scheduled for September 19, 2027. Organizers will likely continue to monitor water quality and weather conditions closely in the lead-up to future events. The charitable donations will be processed, and the community gathering at the Chicago Brewhouse will proceed as planned.