River stage
Lemont, Des Plaines River
- River level
- 6.47 ft
- Status
- Below flood stage
- 7-day change
- -1.28 ft
- Recent high
- 10.89 ft
- Recent low
- 5.49 ft
Last reported 2026-10-13 | NWS LEMI2
- 30-day change
- +0.49 ft
- Average
- 7.22 ft
- Readings
- 122
- Data span
- 122 days
- Record crest
- 13.24 ft
In brief
The Des Plaines River at Lemont, IL read 6.47 ft on Oct 13, 2026, 3.03 ft below action stage. That is 0.49 ft higher than 30 days earlier.
Source: National Weather Service gauge LEMI2
River level timeline
Stage threshold profile
Highest crests on record
| Rank | Crest | Date |
|---|---|---|
| 1 | 13.24 ft | 2020-05-18 |
| 2 | 12.58 ft | 2013-04-19 |
| 3 | 12.41 ft | 2017-10-15 |
| 4 | 12.30 ft | 1957-07-14 |
| 5 | 12.20 ft | 2008-09-15 |
| 6 | 11.96 ft | 2019-05-01 |
| 7 | 11.67 ft | 2018-02-21 |
| 8 | 11.52 ft | 2017-07-23 |
Flood crests recorded at this gauge by the National Weather Service.
What happens at each level
- 10.00 ft
Low-lying areas of the Black Partridge Forest Preserve are inundated.
- 11.00 ft
Trails at the Isle a la Cache Museum are inundated. Water may begin to overflow into the Chicago Sanitary & Ship Canal near Willow Springs.
- 11.50 ft
Veterans Memorial Trail threatened north of the river at Keepataw Preserve.
- 12.50 ft
Romeo Road is threatened in Romeoville.
- 13.00 ft
The lower parking lot at Isle a la Cache Museum begins to flood.
- 13.50 ft
Portions of Centennial Trail near the Romeo Road trailhead are threatened. Flood waters may overflow into the Chicago Sanitary & Ship Canal near Romeoville.
- 14.00 ft
Bluff Road is threatened west of Lemont Road.
- 15.00 ft
Will County Generating Station property is threatened. Isle a la Cache Museum levee is overtopped.
- 16.00 ft
Lemont Road threatened north of the river. Flood waters may overflow into the Chicago Sanitary & Ship Canal near Lemont.
- 18.50 ft
Residences threatened near Bluff Road and Lemont Road.
Written by the local National Weather Service forecast office for this exact gauge.
Frequently asked questions
Is the Des Plaines River flooding at Lemont?
No. The Des Plaines River at Lemont is at 6.47 ft, 3.03 ft below action stage.
What is the flood stage at Lemont?
The National Weather Service sets action stage 9.5 ft, minor flooding 10 ft, moderate flooding 13 ft and major flooding 15 ft.
What is the highest the Des Plaines River has been at Lemont?
The highest crest on record is 13.24 ft, on 2020-05-18.
Is the Des Plaines River high or low right now at Lemont?
At 6.47 ft it is higher than 31% of readings over the last 122 days.
Stage and flood information from the NOAA National Weather Service (gauge LEMI2); daily history from the U.S. Geological Survey (site 05533600). Last reading 2026-10-13. For flood safety decisions always follow official National Weather Service warnings.