Rivers in Illinois
Green River (IL) near Geneseo
Below flood stage
12.90ftStage
Observed Mon, Sep 21, 10:30 PM CDT
- Flood stage
- 15.00 ft
- Forecast crest
- 13.10 ftTue, Sep 22, 7:00 AM CDT
- Record crest
- 21.59 ft1969
Flood stages and impacts
| Category | Stage |
|---|---|
| Major flood | 18.00 ft |
| Moderate flood | 16.50 ft |
| Minor flood | 15.00 ft |
| Action | 14.00 ft |
- 24.00 ftWater reaches the bottom of the Grange Road bridge deck.
- 19.30 ftWater reaches the bottom of the Illinois Highway 82 bridge deck in Geneseo.
- 18.00 ftWater inundates 10th Avenue in south Colona. Water affects levees downstream of Illinois Highway 84.
- 15.50 ftWater affects Illinois Highway 84 north of U.S. Highway 6 in the Colona area.
- 14.50 ftWater affects some roads around south Colona.
Flood outlook
Chance of flooding, September to November
| Category | Chance |
|---|---|
| Minor flooding | 10% |
| Moderate flooding | 6% |
| Major flooding | Under 5% |
The three-month chances are the River Forecast Centers’ long-range flood outlook, issued August 28, 2026.
Crest history
96 crests on NOAA’s list since 1935.
| # | Date | Stage |
|---|---|---|
| 1 | January 23, 1969 | 21.59 ft |
| 2 | May 30, 2011 | 19.38 ft |
| 3 | October 18, 1998 | 18.77 ft |
| 4 | July 1, 2014 | 18.48 ft |
| 5 | December 27, 2008 | 18.32 ft |
| 6 | June 5, 2002 | 17.93 ft |
| 7 | May 30, 2019 | 17.90 ft |
| 8 | March 9, 2009 | 17.86 ft |
| 9 | September 14, 2008 | 17.59 ft |
| 10 | June 22, 1974 | 16.75 ft |
| 11 | May 13, 2010 | 16.73 ft |
| 12 | April 19, 2013 | 16.73 ft |
| 13 | June 16, 2015 | 16.66 ft |
| 14 | January 24, 1965 | 16.65 ft |
| 15 | August 30, 2016 | 16.46 ft |
| 16 | February 20, 1951 | 16.14 ft |
| 17 | April 22, 1973 | 16.00 ft |
| 18 | March 1, 2007 | 15.91 ft |
| 19 | February 21, 1997 | 15.63 ft |
| 20 | March 5, 1950 | 15.59 ft |
| 21 | August 27, 1987 | 15.52 ft |
| 22 | June 29, 1990 | 15.50 ft |
| 23 | February 9, 2001 | 15.35 ft |
| 24 | August 20, 1979 | 15.29 ft |
| 25 | June 9, 1993 | 15.15 ft |
Most recent crests
- May 17, 2020: 14.96 ft
- May 30, 2019: 17.90 ft
- February 21, 2018: 14.22 ft
- July 23, 2017: 14.82 ft
- August 30, 2016: 16.46 ft
- June 16, 2015: 16.66 ft
- July 1, 2014: 18.48 ft
- April 19, 2013: 16.73 ft
- May 4, 2012: 10.78 ft
- May 30, 2011: 19.38 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 48 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.