Rivers in Illinois
Iroquois River at Iroquois
Below flood stage
5.62ftStage
Observed Sun, Sep 27, 11:00 AM CDT
- Flood stage
- 18.00 ft
- Record crest
- 26.31 ft1958
Flood stages and impacts
| Category | Stage |
|---|---|
| Major flood | 25.00 ft |
| Moderate flood | 24.00 ft |
| Minor flood | 18.00 ft |
| Action | 17.00 ft |
- 29.60 ftWater reaches bottom of Route 52 bridge.
- 27.00 ftResidences threatened near US-52/Main Street in Iroquois.
- 26.50 ftUS-52/Main Street threatened near the river in Iroquois.
- 26.00 ftWidespread inundation of structures and roads begins in east Watseka.
- 25.00 ftFlooding of some buildings near the river begins.
- 21.50 ftCounty Road 1950N threatened north of Watseka.
- 18.00 ftAgricultural areas near the river begin to flood.
Flood outlook
Chance of flooding, September to November
| Category | Chance |
|---|---|
| Minor flooding | 29% |
| Moderate flooding | Under 5% |
| Major flooding | Under 5% |
The three-month chances are the River Forecast Centers’ long-range flood outlook, issued September 25, 2026.
Crest history
64 crests on NOAA’s list since 1945.
| # | Date | Stage |
|---|---|---|
| 1 | June 13, 1958 | 26.31 ft |
| 2 | February 22, 2018 | 26.17 ft |
| 3 | January 9, 2008 | 25.81 ft |
| 4 | July 12, 2003 | 25.74 ft |
| 5 | June 21, 2015 | 25.27 ft |
| 6 | July 12, 2015 | 25.16 ft |
| 7 | March 11, 2009 | 24.80 ft |
| 8 | December 30, 1990 | 24.59 ft |
| 9 | March 5, 1979 | 23.81 ft |
| 10 | January 14, 2005 | 23.54 ft |
| 11 | March 13, 1990 | 23.46 ft |
| 12 | October 21, 1993 | 23.35 ft |
| 13 | February 2, 1968 | 23.35 ft |
| 14 | July 10, 1951 | 23.30 ft |
| 15 | December 29, 2015 | 23.07 ft |
| 16 | July 13, 1957 | 22.79 ft |
| 17 | June 13, 2004 | 22.74 ft |
| 18 | February 24, 1982 | 22.56 ft |
| 19 | February 13, 1959 | 22.51 ft |
| 20 | February 25, 1985 | 22.46 ft |
| 21 | January 7, 1993 | 22.29 ft |
| 22 | May 15, 1970 | 22.28 ft |
| 23 | June 28, 2020 | 22.03 ft |
| 24 | May 9, 1998 | 21.96 ft |
| 25 | February 28, 1997 | 21.94 ft |
Most recent crests
- June 28, 2020: 22.03 ft
- May 19, 2020: 17.25 ft
- January 14, 2020: 19.10 ft
- May 3, 2019: 20.59 ft
- February 8, 2019: 17.89 ft
- February 22, 2018: 26.17 ft
- May 5, 2017: 18.69 ft
- April 8, 2017: 18.26 ft
- August 21, 2016: 18.20 ft
- December 29, 2015: 23.07 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.