Long Run near Lemont water level

Name: Long Run near Lemont water level (U.S. Geological Survey)
Creator: U.S. Geological Survey
License: https://www.usgs.gov/information-policies-and-instructions/copyrights-and-credits

River gauge, Long Run, Illinois, United States

Directions

Normal for mid-October

Water level

1.13ft Down 0.18 ft over the last 24 hours

Measured Oct 18, 2026, 04:00 PM CDT (1 hour ago)

Flow: 13.9 cfs

History

7 days 30 days 1 year Years compared

20252026

Water level Normal range (10–90 %) Minor flood stage

What this means

Long Run near Lemont is at 1.13 ft, in the normal range for mid-October.

That puts it 0.16 ft above the median of 0.97 ft for mid-October, based on 35 years of readings. It is 4.87 ft below the flood stage of 6.00 ft. A year ago it stood at 0.63 ft (+0.50 ft).

It has dropped 0.18 ft over the past 24 hours. In the last month it has stayed between 0.94 ft and 5.59 ft.

Fall is often low-water season on rivers, until steadier rain returns.

Compared with 35 years of daily readings for this time of year. How to read levels

Key numbers

Median for this date: 0.97 ft0.16 ft above the median for this date
Normal for this date: 0.67 ft – 1.99 ft8 years in 10 fall in this range (35 years of records)
Same day last year: 0.63 ft+0.50 ft
Lowest and highest in 30 days: 0.94 ft – 5.59 ft
Lowest and highest in 12 months: 0.63 ft – 5.59 ft
Highest on record: 11.10 ftJuly 18, 1996

Floating and fishing near Long Run near Lemont

Normal flows mean predictable rapids and good access at most put-ins.

Flood stage here is 6.00 ft, 4.87 ft above the current reading. Beyond it, the National Weather Service also defines moderate and major flood stages.

What happens at each level

10.00 ft: A few residences are threatened near Lemont Road and Janas Drive south of Lemont. A few residences threatened along the creek near Parker Road in Homer Glen.
9.50 ft: State Street/Lemont Road is threatened south of the creek south of Lemont.
8.00 ft: IL-171 (Archer Avenue) is threatened between 135th Street and State Street south of Lemont.
7.00 ft: 135th Street threatened west of IL-171 (Archer Avenue) south of Lemont. Entrances to numerous residences threatened along 135th Street.
6.00 ft: Entrance road to numerous businesses is threatened near 135th Street and IL-171 (Archer Avenue) south of Lemont.
5.00 ft: Private roads, range land, and forest land are inundated south of Lemont.
1.13 ft: Right now

Impact statements from the U.S. National Weather Service.

Highest crests on record

Rank	Level	Date
1	11.10 ft	July 18, 1996
2	9.91 ft	October 10, 1954
3	9.37 ft	July 13, 1957
4	9.01 ft	June 13, 1981
5	8.94 ft	June 9, 2011
6	8.32 ft	May 12, 1966
7	8.30 ft	February 21, 1997
8	8.18 ft	June 13, 1952
9	8.10 ft	May 4, 1979
10	8.09 ft	June 27, 2003

Weather at the gauge

Rain in the last 3 days: 1.52 in. Rain that falls upstream can take hours or days to show up at a river gauge.

18 Sun 62° 40° – Wind 14 mph

19 Mon 65° 42° – Wind 9 mph

20 Tue 66° 45° – Wind 6 mph

21 Wed 67° 48° – Wind 5 mph

22 Thu 69° 52° – Wind 4 mph

23 Fri 71° 54° – Wind 8 mph

24 Sat 70° 54° – Wind 13 mph

Forecast: Open-Meteo

Sunrise 07:08 AM Sunset 06:08 PM Daylight 11 hr First quarter 53%

Map

Nearby gauges

Gauge	Level	Compared with normal	24 hours	Distance
Chicago Sanitary and Ship Canal at LemontRiver gauge, Chicago Sanitary and Ship Canal	25.28 ft	High	−0.23 ft	2.5 mi
Des Plaines River near LemontRiver gauge, Des Plaines River	6.45 ft	Normal	−0.47 ft	2.5 mi
Chicago Sanitary and Ship Canal near LemontRiver gauge, Chicago Sanitary and Ship Canal	25.37 ft	High	−0.38 ft	3.8 mi
Sawmill Creek near LemontRiver gauge, Sawmill Creek	8.47 ft	Normal	−0.07 ft	4.9 mi
East Branch Du Page River at BolingbrookRiver gauge, East Branch Du Page River	15.09 ft	Normal	−0.15 ft	6 mi
Flag Creek near Willow SpringsRiver gauge, Flag Creek	3.36 ft	Normal	−0.06 ft	9 mi
Des Plaines River at Route 53 at JolietRiver gauge, Des Plaines River	538.97 ft	Normal	±0	9 mi
West Branch Du Page River near NapervilleRiver gauge, West Branch Du Page River	4.59 ft	Normal	−0.23 ft	9 mi

Questions and answers

How does Long Run near Lemont compare with last year?

It is 0.50 ft higher than on the same day last year, when the reading was 0.63 ft.

What is flood stage for Long Run near Lemont?

The official flood stage is 6.00 ft. The level is currently 4.87 ft below it.

What is a normal level for Long Run near Lemont in mid-October?

The median for mid-October is 0.97 ft. In 8 years out of 10 the reading falls between 0.67 ft and 1.99 ft, based on 35 years of records.

Is gage height the same as water depth?

No. Gage height is measured from a fixed reference point chosen by the agency, so a reading of 10 ft does not mean the river is 10 ft deep.

What is the water level of Long Run near Lemont today?

On Oct 18, 2026, 04:00 PM CDT, the water level was 1.13 ft. Down 0.18 ft over the last 24 hours.

Is Long Run near Lemont rising or falling?

Down 0.18 ft over the last 24 hours. Up 0.10 ft over the last 7 days.

Is the level of Long Run near Lemont normal?

Normal for mid-October. Compared with 35 years of daily readings for this time of year.

For specialists

Station codes, datum, parameters, data quality and downloads

Operator: U.S. Geological Survey
Station code: usgs:05537500 (Agency page)
Coordinates: 41.64261, -87.99936 (WGS84)
Vertical datum: NAVD88
Update interval: every 15 minutes
Licence: Public domain. Data: U.S. Geological Survey (USGS), provisional data subject to revision

Published series

Parameter	Last value	Time (UTC)	Quality
Water level	1.13 ft	2026-10-18 21:00	Provisional
Flow	13.9 cfs	2026-10-18 21:00	Provisional

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How to cite

U.S. Geological Survey: Long Run near Lemont (usgs:05537500). Accessed October 18, 2026 via Nivelmap, https://nivelmap.com/en/united-states/illinois/long-run-near-lemont

How we check values

Each reading is stored as published. We hold back values that jump faster than physically plausible and show the measurement time with every value.

Readings are provisional, can be delayed or wrong and are not a flood warning. Read the disclaimer