Rivers in Illinois
Mackinaw River near Congerville
Below flood stage
1.40ftStage
Observed Tue, Sep 22, 12:45 AM CDT
- Flood stage
- 13.00 ft
- Record crest
- 20.21 ft1982
Flood stages and impacts
| Category | Stage |
|---|---|
| Major flood | 20.00 ft |
| Moderate flood | 14.00 ft |
| Minor flood | 13.00 ft |
| Action | 10.00 ft |
- 13.00 ftWidespread agricultural flooding occurs.
- 11.00 ftTyrrell Road, 2 miles northeast of Mackinaw, begins to flood.
- 10.00 ftMinor flooding begins to low lying areas near the river.
Flood outlook
Chance of flooding, September to November
| Category | Chance |
|---|---|
| Minor flooding | 21% |
| Moderate flooding | 20% |
| Major flooding | Under 5% |
The three-month chances are the River Forecast Centers’ long-range flood outlook, issued August 28, 2026.
Crest history
111 crests on NOAA’s list since 1945.
| # | Date | Stage |
|---|---|---|
| 1 | December 4, 1982 | 20.21 ft |
| 2 | October 4, 1986 | 19.61 ft |
| 3 | June 3, 1980 | 19.52 ft |
| 4 | July 9, 1951 | 19.41 ft |
| 5 | December 29, 2015 | 19.09 ft |
| 6 | September 15, 2008 | 18.84 ft |
| 7 | April 18, 2013 | 18.79 ft |
| 8 | December 30, 2015 | 18.53 ft |
| 9 | January 14, 2005 | 18.45 ft |
| 10 | September 15, 1993 | 18.37 ft |
| 11 | March 5, 1979 | 18.35 ft |
| 12 | January 11, 2008 | 18.22 ft |
| 13 | May 12, 2002 | 18.13 ft |
| 14 | March 11, 1990 | 18.06 ft |
| 15 | July 16, 2020 | 17.75 ft |
| 16 | May 2, 2019 | 17.65 ft |
| 17 | November 20, 1985 | 17.62 ft |
| 18 | June 23, 1974 | 17.48 ft |
| 19 | November 1, 2009 | 17.44 ft |
| 20 | January 5, 1993 | 17.38 ft |
| 21 | May 14, 1995 | 17.33 ft |
| 22 | February 7, 2008 | 17.04 ft |
| 23 | May 19, 2020 | 16.92 ft |
| 24 | June 14, 1999 | 16.89 ft |
| 25 | July 11, 2015 | 16.82 ft |
Most recent crests
- August 17, 2026: 14.58 ft
- June 18, 2026: 13.10 ft
- June 13, 2026: 14.52 ft
- April 4, 2026: 12.56 ft
- April 29, 2024: 13.40 ft
- January 27, 2024: 11.03 ft
- April 1, 2022: 10.05 ft
- February 18, 2022: 11.09 ft
- October 30, 2021: 10.30 ft
- October 27, 2021: 10.21 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 precipitation and the precipitation amounts expected approximately 24 hours into the future from the forecast issuance time.
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.