Major Flood
19 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
16 ft
Minor Flood
12 ft
Action Stage
10 ft
What Floods at Each Level
24 ft
Residential structures may be threatened along Forest Drive and West Avenue west of Coal City.
22 ft
Structures may be threatened along Spring Road west of Coal City. Whitetie Road may be threatened west of Coal City.
20 ft
IL-113, Pine Bluff Road, and McArdle Road may be threatened west of Coal City. Reed Road may be threatened southwest of Coal City.
18 ft
Spring Road may be threatened west of Coal City.
16 ft
Gorman Road and Grand Ridge Road may be threatened southwest of Coal City. Widespread inundation of agricultural land occurs.
15 ft
Water may begin to overflow into nearby lakes along the river.
12 ft
Low-lying agricultural land is inundated west of Coal City.
10 ft
Low-lying agricultural land is inundated northwest of Coal City near the Illinois River.
8 ft
Water overtops low-lying banks along the river west of Coal City.
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 |
|---|---|---|
| Aug 7, 1924 | 21 ft | — |
| Jul 14, 1958 | 19.7 ft | 17,600 cfs |
| Dec 3, 1982 | 19.51 ft | 22,400 cfs |
About This Gauge
Get Flood Alerts for Mazon River
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 Mazon River near Coal City?
The Mazon River near Coal City gauge is maintained by USGS (site 05542000) 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 Mazon River near Coal City?
The NWS-defined flood stage for Mazon River near Coal City is 12 feet. Action stage begins at 10 feet. Moderate flooding starts at 16 feet, and major flooding at 19 feet.
How do I get alerts when Mazon River rises?
Download StormCast free on Google Play, go to River Gauges, and add Mazon River near Coal City 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 Mazon River near Coal City gauge located?
The gauge is located in Grundy County, Illinois at coordinates 41.2862°N, 88.3599°W. USGS site number: 05542000. Data is provided by the U.S. Geological Survey and the National Weather Service.
On This River
Downstream: Illinois River at Morris
More Resources
Source & Notes
Data provided by: US Geological Survey, Observations courtesy of U.S. Geological Survey
- River forecasts for this location take into account past and future precipitation. The stages/flows that will occur may be different if future rainfall is different than forecast.