Great Lakes

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Chicago's 31st Street Beach with a yellow swim advisory flag flying, indicating high bacteria levels in the water.

31st Street Beach Swim Advisory Issued Due to High Bacteria

At Chicago's 31st Street Beach, a yellow swim advisory flag was implemented on Thursday, May 28, 2026, when bacteria levels exceeded 235 CFU, according to City of Chicago Beach Lab Data .

Rafael Mendoza·May 30, 2026