Major Flood
10 ft
Current Water Level
Gage Height
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Streamflow
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Last Reading
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FLOOD STAGES
Know the flood categories.
Flood stages defined by the National Weather Service. Gage height data from USGS Water Resources.
Moderate Flood
8 ft
Minor Flood
6 ft
Action Stage
5 ft
What Floods at Each Level
10 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.
9.5 ft
State Street/Lemont Road is threatened south of the creek south of Lemont.
8 ft
IL-171 (Archer Avenue) is threatened between 135th Street and State Street south of Lemont.
7 ft
135th Street threatened west of IL-171 (Archer Avenue) south of Lemont. Entrances to numerous residences threatened along 135th Street.
6 ft
Entrance road to numerous businesses is threatened near 135th Street and IL-171 (Archer Avenue) south of Lemont.
5 ft
Private roads, range land, and forest land are inundated south of Lemont.
Impact statements from the National Weather Service, describing what typically happens at each water level.
Low-Water Impacts
0.5
River nears zero flow.
What happens as water levels drop, per the National Weather Service.
7-Day Water Level Chart
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Historic Crests
| Date | Stage | Flow |
|---|---|---|
| Jul 17, 1996 | 11.1 ft | 5,310 cfs |
| Oct 9, 1954 | 9.91 ft | 3,160 cfs |
| Jul 12, 1957 | 9.37 ft | 2,390 cfs |
About This Gauge
Get Flood Alerts for Long Run
StormCast monitors this gauge and sends a push notification to your phone when the water level crosses into a new flood category — even at 3 AM.
Frequently Asked Questions
What is the current water level of Long Run near Lemont?
The Long Run near Lemont gauge is maintained by USGS (site 05537500) and reports water levels every 15 minutes. Visit this page to see the latest reading updated live, or download StormCast to get push alerts when levels rise.
What is flood stage for Long Run near Lemont?
The NWS-defined flood stage for Long Run near Lemont is 6 feet. Action stage begins at 5 feet. Moderate flooding starts at 8 feet, and major flooding at 10 feet.
How do I get alerts when Long Run rises?
Download StormCast free on Google Play, go to River Gauges, and add Long Run near Lemont to your watchlist. StormCast will send a push notification to your phone whenever the water level crosses into a new NWS flood category.
Where is the Long Run near Lemont gauge located?
The gauge is located in Cook County, Illinois at coordinates 41.6426°N, 87.9994°W. USGS site number: 05537500. Data is provided by the U.S. Geological Survey and the National Weather Service.
On This River
Downstream: Des Plaines River at Joliet
More Resources
Source & Notes
Data provided by: Observations courtesy of U.S. Geological Survey