Stale — older than 1 week No flood stage data USGS

Calumet Sag Channel At Blue Island, IL

Updated December 9, 2025 at 11:03:00 AM CST · ProvisionalUSGS real-time data that has not finished review. Values can be revised, corrected, or removed after approval. · Site 05536368

Current conditions

Historical trends

Hourly measurements

Detailed readings by hour, organized by day

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Data courtesy of the U.S. Geological Survey.