RIVER GAUGE · CALUMET UNION DRAINAGE CANAL
Calumet Union Drainage Canal at Markham
Cook County, Illinois
Water level2.48 ft
Flow—
Last readingSep 16, 2026, 5:15 PM UTC (last recorded)
Action9 ft
Minor flood10 ft
Moderate flood10.5 ft
Major flood11.5 ft
The past week
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What floods at each level
- 12.5 ft
Widespread inundation of roadways and structures in the floodplain reaches 2 blocks from the canal in Markham and Harvey.
- 11 ft
Multiple structures are threatened in Markham and Harvey.
- 10 ft
Multiple roadways are threatened in Markham and Harvey. Low-lying sections of Martin Luther King Park are inundated in Markham.
- 9 ft
Water overflows low-lying river banks along the canal in Markham and Harvey.
Highest crests on record
| Date | Level | Flow |
|---|---|---|
| Oct 10, 1954 | 12 ft | — |
| Jul 12, 1957 | 11.5 ft | — |
| Sep 13, 2008 | 10 ft | — |
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