Des Plaines River near Lemont, IL
River level and flood forecast · Will County
Normal6.6 ftas of Mon 2 PM
The river is 3.4 ft below flood stage (10 ft).
Flow: 754 cubic feet per second (USGS).
The last 7 days and the forecast
NWS forecast issued Sat, Oct 3, 7:45 PM. Forecasts change as rain falls and as upstream water arrives.
Flood stages
| Major flood stage | 15 ft |
| Moderate flood stage | 13 ft |
| Flood stage | 10 ft |
| Action stage | 9.5 ft |
| Record crest (May 18, 2020) | 13.24 ft |
What floods at each level
From the National Weather Service, highest first.
- 18.5 ftResidences threatened near Bluff Road and Lemont Road.
- 16 ftLemont Road threatened north of the river. Flood waters may overflow into the Chicago Sanitary & Ship Canal near Lemont.
- 15 ftWill County Generating Station property is threatened. Isle a la Cache Museum levee is overtopped.
- 14 ftBluff Road is threatened west of Lemont Road.
- 13.5 ftPortions of Centennial Trail near the Romeo Road trailhead are threatened. Flood waters may overflow into the Chicago Sanitary & Ship Canal near Romeoville.
- 13 ftThe lower parking lot at Isle a la Cache Museum begins to flood.
- 12.5 ftRomeo Road is threatened in Romeoville.
- 11.5 ftVeterans Memorial Trail threatened north of the river at Keepataw Preserve.
- 11 ftTrails at the Isle a la Cache Museum are inundated. Water may begin to overflow into the Chicago Sanitary & Ship Canal near Willow Springs.
- 10 ftLow-lying areas of the Black Partridge Forest Preserve are inundated.
Highest crests on record
- 13.24 ft — May 18, 2020
- 12.58 ft — April 19, 2013
- 12.41 ft — October 15, 2017
- 12.3 ft — July 14, 1957
- 11.96 ft — May 1, 2019
Recent crests: 10.7 ft (June 27, 2021) · 13.24 ft (May 18, 2020) · 11.15 ft (May 1, 2020) · 11.96 ft (May 1, 2019) · 11.2 ft (June 23, 2018)
Up and down the river, and nearby
- UpstreamDes Plaines River at Lyons, IL
- DownstreamDes Plaines River at Joliet, IL
- Long Run near Lemont, IL
- Chicago Sanitary and Ship Canal at Romeoville, IL
- Chicago Sanitary and Ship Canal at Lemont, IL
- East Branch Du Page River at Bolingbrook, IL
- Sawmill Creek (IL) near Lemont, IL
- West Branch Du Page River near Naperville, IL
- Du Page River near Plainfield, IL
- Spring Brook at Naperville (87th Street), IL
Not an official source. River levels, forecasts, flood stages and impacts are from the National Weather Service (LEMI2); flow from the U.S. Geological Survey. Readings are provisional. In a flood, follow your local officials and the NWS at weather.gov.