Rivers in Illinois
Illinois River near Henry
Below flood stage
17.65ftStage
Observed Tue, Sep 22, 1:45 AM CDT
- Flood stage
- 23.00 ft
- Forecast crest
- 18.40 ftWed, Sep 23, 1:00 AM CDT
- Record crest
- 32.94 ft2013
Flood stages and impacts
| Category | Stage |
|---|---|
| Major flood | 31.00 ft |
| Moderate flood | 24.00 ft |
| Minor flood | 23.00 ft |
| Action | 22.00 ft |
- 32.50 ftIllinois Route 18 in Marshall County is closed. Parts of Illinois Route 17 between Sparland and Lacon are closed.
- 32.00 ftWater begins flooding parts of Illinois Route 18 between Henry and Illinois Route 26. Parts of Illinois Route 17 begin to flood.
- 30.50 ftThe Marina building is flooded. Inundation from Waterworks Park on Cromwell Drive toward old grain elevator location on Water Street.
- 29.60 ftA few homes begin to flood in Henry.
- 28.50 ftHennepin levee overtopped.
- 28.00 ftFlooding begins to affect buildings east of Illinois Route 29 in Sparland.
- 23.00 ftWater begins to affect the marina in Henry along with minor flooding of land adjacent to the river.
Flood outlook
Chance of flooding, September to November
| Category | Chance |
|---|---|
| Minor flooding | 25% |
| 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
101 crests on NOAA’s list since 1943.
| # | Date | Stage |
|---|---|---|
| 1 | April 22, 2013 | 32.94 ft |
| 2 | March 22, 1979 | 32.67 ft |
| 3 | May 23, 1943 | 32.20 ft |
| 4 | March 7, 1985 | 32.02 ft |
| 5 | May 21, 2020 | 31.62 ft |
| 6 | March 13, 2009 | 31.49 ft |
| 7 | May 6, 2019 | 31.35 ft |
| 8 | March 5, 1985 | 31.25 ft |
| 9 | September 19, 2008 | 30.98 ft |
| 10 | March 22, 1982 | 30.74 ft |
| 11 | December 8, 1982 | 30.70 ft |
| 12 | March 2, 1997 | 30.56 ft |
| 13 | June 30, 2015 | 30.39 ft |
| 14 | June 1, 2019 | 30.01 ft |
| 15 | December 7, 1982 | 29.97 ft |
| 16 | January 2, 2016 | 29.78 ft |
| 17 | February 27, 2018 | 29.21 ft |
| 18 | May 19, 2009 | 28.89 ft |
| 19 | May 29, 1995 | 28.84 ft |
| 20 | November 23, 1985 | 28.58 ft |
| 21 | May 18, 2002 | 28.28 ft |
| 22 | January 17, 2005 | 27.93 ft |
| 23 | November 21, 1985 | 27.92 ft |
| 24 | January 1, 2009 | 27.49 ft |
| 25 | May 12, 1998 | 27.38 ft |
Most recent crests
- July 7, 2026: 23.12 ft
- June 24, 2026: 24.24 ft
- April 21, 2026: 21.94 ft
- April 7, 2026: 22.06 ft
- May 2, 2024: 22.63 ft
- April 9, 2024: 22.65 ft
- January 31, 2024: 25.55 ft
- April 7, 2023: 21.01 ft
- March 8, 2023: 21.36 ft
- May 9, 2022: 21.20 ft
Nearby
Upstream, downstream and the gauges around this one.
What this means
Forecasts by the North Central River Forecast Center. Forecasts are issued routinely year-round. 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.