How high is the Long Run Near Lemont, IL right now?

The Long Run Near Lemont, IL is currently flowing at 3 cubic feet per second with a gage height of 0.70 feet, based on the most recent USGS instantaneous reading.

Is the flow on the Long Run Near Lemont, IL normal for this time of year?

Current flow is classified as low for June 11. Today's discharge is at the 23th percentile compared to the long-term historical record at this gauge.

Is the Long Run Near Lemont, IL at flood stage?

No — the gage height is 5.30 feet below the NWS flood-stage threshold of 6.0 feet.

What is the historical median flow for the Long Run Near Lemont, IL on June 11?

The long-term median discharge for this date is 7 cfs based on USGS daily statistics. The 10th–95th percentile range historically is 1 to 155 cfs.

Where is the Long Run Near Lemont, IL stream gauge located?

The Long Run Near Lemont, IL stream gauge is operated by the USGS in Cook County, IL on the Long Run. USGS site number 05537500 (coordinates 41.6426, -87.9994).

Long Run Near Lemont, IL

USGS Site No: 05537500 • Long Run • Cook County, IL

Long Run Near Lemont, IL on the Long Run is currently at 3 cfs (Low — 23th percentile for this date) . Gage height: 0.70 ft.

Reading from 1 week ago

CFS Discharge

0.70

Gage Height (ft)

Low

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	Today's Flow
10th	Very Low threshold	1
25th	Low threshold	3	Today: 3 cfs
50th (Median)	Normal (median)	7
75th	High threshold	23
95th	Very High threshold	155

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	4	0.77
May 27, 2026	5	0.82
May 26, 2026	8	0.91
May 25, 2026	12	1.11
May 24, 2026	14	1.24
May 23, 2026	4	0.75
May 22, 2026	5	0.81
May 21, 2026	6	0.86
May 20, 2026	8	0.91
May 19, 2026	12	1.09
May 18, 2026	10	1.04
May 17, 2026	5	0.80
May 16, 2026	5	0.82
May 15, 2026	6	0.84
Apr 20, 2026	28	2.12
Apr 19, 2026	47	2.71
Apr 18, 2026	137	4.20
Apr 17, 2026	32	2.20
Apr 16, 2026	41	2.54
Apr 15, 2026	32	2.24
Apr 14, 2026	29	2.13
Apr 13, 2026	23	1.93
Apr 12, 2026	20	1.78
Apr 11, 2026	24	1.95
Apr 10, 2026	29	2.15
Apr 9, 2026	24	1.96
Apr 8, 2026	30	2.20
Apr 7, 2026	41	2.54
Apr 6, 2026	60	3.03
Apr 5, 2026	120	4.06

Station Information

USGS Site No: 05537500
State: IL
County: Cook County
Coordinates: 41.6426, -87.9994
Drainage Area: 21 mi²
Datum (ft): 637.0
HUC Code: 07120004

View on USGS NWIS →

Flood Stage Thresholds

Action Stage: 5.0 ft
Flood Stage: 6.0 ft
Moderate Flood: 8.0 ft
Major Flood: 10.0 ft

Currently 5.30 ft below flood stage.

Recent Extremes

Max discharge: 354 cfs

Jan 9, 2026
Min discharge: 1 cfs

May 19, 2025
Days at flood stage: 0

Computed from the local daily-values archive.

Nearby Gauges

Des Plaines River Near Lemont, IL
2.5 mi · 452 cfs

Normal
Chicago Sanitary And Ship Canal at Romeoville, IL
3.1 mi · 0 cfs

Unknown
Chicago Sanitary And Ship Canal near Lemont, IL
3.8 mi · 1,300 cfs

Very Low
Sawmill Creek Near Lemont, IL
4.9 mi · 1 cfs

Low
Flag Creek Near Willow Springs, IL
8.5 mi · 12 cfs

Normal