How high is the Calumet Union Drainage Canal Near Markham, IL right now?

The Calumet Union Drainage Canal Near Markham, IL is currently flowing at 13 cubic feet per second with a gage height of 2.59 feet, based on the most recent USGS instantaneous reading.

Is the flow on the Calumet Union Drainage Canal Near Markham, IL normal for this time of year?

Current flow is classified as very high for June 11. Today's discharge is at the 95th percentile compared to the long-term historical record at this gauge.

Is the Calumet Union Drainage Canal Near Markham, IL at flood stage?

No — the gage height is 7.41 feet below the NWS flood-stage threshold of 10.0 feet.

What is the historical median flow for the Calumet Union Drainage Canal Near Markham, IL on June 11?

The long-term median discharge for this date is 3 cfs based on USGS daily statistics. The 10th–95th percentile range historically is 0 to unavailable cfs.

Where is the Calumet Union Drainage Canal Near Markham, IL stream gauge located?

The Calumet Union Drainage Canal Near Markham, IL stream gauge is operated by the USGS in Cook County, IL on the Calumet Union Drainage Canal. USGS site number 05536310 (coordinates 41.5970, -87.6657).

Calumet Union Drainage Canal Near Markham, IL

USGS Site No: 05536310 • Calumet Union Drainage Canal • Cook County, IL

Calumet Union Drainage Canal Near Markham, IL on the Calumet Union Drainage Canal is currently at 13 cfs (Very High — 95th percentile for this date) . Gage height: 2.59 ft.

Reading from 1 week ago

CFS Discharge

2.59

Gage Height (ft)

Very High

Flow Condition

Normal

Flood Status

Historical Percentile Comparison

Today's discharge compared to the long-term record for June 11 at this station. Percentile rank shows what fraction of historical years had lower flow on this date.

Percentile	Label	CFS Threshold
10th	Very Low threshold	0
25th	Low threshold	1
50th (Median)	Normal (median)	3
75th	High threshold	5
95th	Very High threshold	0

30-Day Hydrograph

Recent discharge plotted against the historical 10th–95th percentile envelope for the same calendar days. Source: USGS daily values + long-term statistics.

10th–95th historical Day-of-year median Recent discharge

30-Day Flow History

Date	Discharge (CFS)	Gage Ht (ft)
May 28, 2026	3	2.16
May 27, 2026	3	2.17
May 26, 2026	4	2.20
May 25, 2026	5	2.29
May 24, 2026	20	2.67
May 23, 2026	3	2.17
May 22, 2026	3	2.18
May 21, 2026	4	2.20
May 20, 2026	4	2.22
May 19, 2026	6	2.32
May 18, 2026	17	2.61
May 17, 2026	4	2.22
May 16, 2026	5	2.25
May 15, 2026	4	2.24
Apr 20, 2026	11	2.51
Apr 19, 2026	10	2.47
Apr 18, 2026	32	2.99
Apr 17, 2026	12	2.50
Apr 16, 2026	22	2.82
Apr 15, 2026	11	2.50
Apr 14, 2026	15	2.61
Apr 13, 2026	27	2.89
Apr 12, 2026	33	3.08
Apr 11, 2026	37	3.15
Apr 10, 2026	43	3.20
Apr 9, 2026	39	3.11
Apr 8, 2026	67	3.62
Apr 7, 2026	58	3.48
Apr 6, 2026	38	3.16
Apr 5, 2026	66	3.58

Station Information

USGS Site No: 05536310
State: IL
County: Cook County
Coordinates: 41.5970, -87.6657
Drainage Area: 13 mi²
Datum (ft): 597.1
HUC Code: 07120003

View on USGS NWIS →

Flood Stage Thresholds

Action Stage: 9.0 ft
Flood Stage: 10.0 ft
Moderate Flood: 10.5 ft
Major Flood: 11.5 ft

Currently 7.41 ft below flood stage.

Recent Extremes

Max discharge: 355 cfs

Apr 4, 2026
Min discharge: 1 cfs

Dec 5, 2025
Days at flood stage: 0

Computed from the local daily-values archive.

Nearby Gauges

Midlothian Creek at Oak Forest, IL
3.5 mi · 1 cfs

Very Low
Thorn Creek at Thornton, IL
3.6 mi · 41 cfs

Normal
Little Calumet River at South Holland, IL
3.6 mi · 51 cfs

Low
Natalie Creek at Midlothian, IL
3.9 mi · 0 cfs

Low
Butterfield Creek at Flossmoor, IL
4.0 mi · 1 cfs

Very Low