Rivers in Illinois
Mazon River near Coal City
Below flood stage
2.01ftStage
Observed Tue, Sep 22, 9:45 AM CDT
- Flood stage
- 12.00 ft
- Record crest
- 21.00 ft1924
Flood stages and impacts
| Category | Stage |
|---|---|
| Major flood | 19.00 ft |
| Moderate flood | 16.00 ft |
| Minor flood | 12.00 ft |
| Action | 10.00 ft |
- 24.00 ftResidential structures may be threatened along Forest Drive and West Avenue west of Coal City.
- 22.00 ftStructures may be threatened along Spring Road west of Coal City. Whitetie Road may be threatened west of Coal City.
- 20.00 ftIL-113, Pine Bluff Road, and McArdle Road may be threatened west of Coal City. Reed Road may be threatened southwest of Coal City.
- 18.00 ftSpring Road may be threatened west of Coal City.
- 16.00 ftGorman Road and Grand Ridge Road may be threatened southwest of Coal City. Widespread inundation of agricultural land occurs.
- 15.00 ftWater may begin to overflow into nearby lakes along the river.
- 12.00 ftLow-lying agricultural land is inundated west of Coal City.
- 10.00 ftLow-lying agricultural land is inundated northwest of Coal City near the Illinois River.
- 8.00 ftWater overtops low-lying banks along the river west of Coal City.
Flood outlook
Chance of flooding, September to November
| Category | Chance |
|---|---|
| Minor flooding | 13% |
| Moderate flooding | Under 5% |
| Major flooding | Under 5% |
The three-month chances are the River Forecast Centers’ long-range flood outlook, issued August 28, 2026.
Crest history
72 crests on NOAA’s list since 1924.
| # | Date | Stage |
|---|---|---|
| 1 | August 8, 1924 | 21.00 ft |
| 2 | July 15, 1958 | 19.70 ft |
| 3 | December 4, 1982 | 19.51 ft |
| 4 | November 28, 1990 | 18.83 ft |
| 5 | September 15, 2008 | 18.54 ft |
| 6 | April 25, 1950 | 18.50 ft |
| 7 | May 15, 1970 | 18.15 ft |
| 8 | June 26, 1968 | 18.11 ft |
| 9 | April 18, 2013 | 18.00 ft |
| 10 | May 18, 2020 | 17.88 ft |
| 11 | February 24, 1985 | 17.80 ft |
| 12 | February 7, 1942 | 17.28 ft |
| 13 | February 13, 1984 | 16.82 ft |
| 14 | November 19, 1985 | 16.75 ft |
| 15 | May 1, 2019 | 16.41 ft |
| 16 | December 29, 2015 | 16.40 ft |
| 17 | April 23, 1944 | 16.22 ft |
| 18 | April 12, 1979 | 16.19 ft |
| 19 | May 12, 1943 | 16.13 ft |
| 20 | March 9, 2009 | 15.80 ft |
| 21 | May 8, 2012 | 15.48 ft |
| 22 | June 2, 1980 | 15.37 ft |
| 23 | April 5, 1947 | 15.31 ft |
| 24 | January 14, 2005 | 15.22 ft |
| 25 | September 2, 1989 | 15.17 ft |
Most recent crests
- June 28, 2021: 10.81 ft
- May 18, 2020: 17.88 ft
- April 30, 2020: 13.04 ft
- May 1, 2019: 16.41 ft
- February 21, 2018: 12.87 ft
- May 1, 2017: 11.35 ft
- August 29, 2016: 11.57 ft
- July 19, 2016: 13.78 ft
- December 29, 2015: 16.40 ft
- June 27, 2015: 11.75 ft
Nearby
Upstream, downstream and the gauges around this one.
What this means
Forecasts by the North Central River Forecast Center. Forecasts are issued as needed during times of high water, but are not routinely available. 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.
Sources
Stage, flood stages, impacts and crest history from NOAA’s National Water Prediction Service. Streamflow and the daily record from the U.S. Geological Survey.