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Green River (IL) near Geneseo

Highest listed crest 21.59 ftFlood stage 15.0 ft25 crests since 1969

The Green River (IL) near Geneseo crested at major flood stage 5 times among the 25 crests the National Weather Service lists from 1969 to 2020. The highest, 21.59 ft on January 23, 1969, was major flooding, 6.59 feet above flood stage.

The gauge

Highest listed crest
21.59 ft
January 23, 1969
Flood stage
15.0 ft
Major flooding from 18.0 ft
Crests at major
5
56th of 177 gauges in Illinois
Most recent flood crest
May 30, 2019
17.90 ft, moderate flooding
Location
Henry County
Near East Moline (12.1 mi)

Flood stages

The thresholds the National Weather Service uses for this gauge today, and how many listed crests reached each.

Flood categories, Green River (IL) near Geneseo
Action stage14.03May 17, 2020The level at which the NWS or its partners begin to take action
Flood stage (minor)15.03Aug 30, 2016Minimal or no property damage, but possibly some public threat
Moderate flood stage16.57May 30, 2019Some inundation of structures and roads near the stream
Major flood stage18.05Jul 1, 2014Extensive inundation of structures and roads

Every listed crest

25 crests from 1969 to 2020. Filled: at or above flood stage. Hover a crest for its date and stage.

Listed crests at the Green River (IL) near Geneseo, 1969 to 2020 510152025ft Flood stage 15.0 ftMajor 18.0 ft Jan 23, 1969: 21.59 ft, major floodingMay 9, 1998: 13.09 ft, below flood stage; 4,800 cubic feet per secondOct 18, 1998: 18.77 ft, major flooding; 10,300 cubic feet per secondJul 5, 2000: 12.55 ft, below flood stage; 4,480 cubic feet per secondFeb 9, 2001: 15.35 ft, minor flooding; 6,520 cubic feet per secondJun 5, 2002: 17.93 ft, moderate flooding; 9,520 cubic feet per secondMay 1, 2003: 13.09 ft, below flood stage; 5,340 cubic feet per secondMay 31, 2004: 13.77 ft, below flood stage; 5,840 cubic feet per secondJan 13, 2005: 8.86 ft, below flood stage; 2,490 cubic feet per secondApr 18, 2006: 5.84 ft, below flood stage; 996 cubic feet per secondMar 1, 2007: 15.91 ft, minor flooding; 7,610 cubic feet per secondSep 14, 2008: 17.59 ft, moderate flooding; 9,110 cubic feet per secondDec 27, 2008: 18.32 ft, major flooding; 9,930 cubic feet per secondMar 9, 2009: 17.86 ft, moderate floodingMay 13, 2010: 16.73 ft, moderate flooding; 8,330 cubic feet per secondMay 30, 2011: 19.38 ft, major flooding; 10,800 cubic feet per secondMay 4, 2012: 10.78 ft, below flood stage; 3,680 cubic feet per secondApr 19, 2013: 16.73 ft, moderate flooding; 8,270 cubic feet per secondJul 1, 2014: 18.48 ft, major flooding; 9,959 cubic feet per secondJun 16, 2015: 16.66 ft, moderate flooding; 7,530 cubic feet per secondAug 30, 2016: 16.46 ft, minor flooding; 8,030 cubic feet per secondJul 23, 2017: 14.82 ft, action stage; 6,670 cubic feet per secondFeb 21, 2018: 14.22 ft, action stage; 6,200 cubic feet per secondMay 30, 2019: 17.90 ft, moderate flooding; 11,400 cubic feet per secondMay 17, 2020: 14.96 ft, action stage; 11,400 cubic feet per second Highest, 21.59 ft, Jan 23, 1969 197019801990200020102020

Crests at or above flood stage, by decade

Crests at or above flood stage per decade, Green River (IL) near Geneseo 1960s: 1 1970s: 0 1980s: 0 1990s: 1 2000s: 6 2010s: 7 7 2020s: 0 1960s1970s1980s1990s2000s2010s2020s
  1. These are the crests the local National Weather Service office lists for the gauge: the highest on record and recent crests. Lesser floods between them may be missing, so counts by decade are a floor.
  2. Categories use today's flood stages. Levees, dams and channel changes since a crest can make old and new stages not directly comparable.
  3. 69 crests measured on an earlier gauge datum are left out: 13.00 ft on Oct 10, 1935; 12.95 ft on Oct 9, 1936; 14.00 ft on Jan 24, 1938; 14.27 ft on Jan 30, 1938; 13.56 ft on Mar 12, 1939; 11.44 ft on Mar 4, 1940; and more.

Highest crests

Highest listed crests, Green River (IL) near Geneseo
1Jan 23, 196921.59+6.59Major—
2May 30, 201119.38+4.38Major10,800
3Oct 18, 199818.77+3.77Major10,300
4Jul 1, 201418.48+3.48Major9,959
5Dec 27, 200818.32+3.32Major9,930
6Jun 5, 200217.93+2.93Moderate9,520
7May 30, 201917.90+2.90Moderate11,400
8Mar 9, 200917.86+2.86Moderate—
9Sep 14, 200817.59+2.59Moderate9,110
10May 13, 201016.73+1.73Moderate8,330
11Apr 19, 201316.73+1.73Moderate8,270
12Jun 16, 201516.66+1.66Moderate7,530
13Aug 30, 201616.46+1.46Minor8,030
14Mar 1, 200715.91+0.91Minor7,610
15Feb 9, 200115.35+0.35Minor6,520
16May 17, 202014.96−0.04Action11,400
17Jul 23, 201714.82−0.18Action6,670
18Feb 21, 201814.22−0.78Action6,200
19May 31, 200413.77−1.23Below flood stage5,840
20May 9, 199813.09−1.91Below flood stage4,800
21May 1, 200313.09−1.91Below flood stage5,340
22Jul 5, 200012.55−2.45Below flood stage4,480
23May 4, 201210.78−4.22Below flood stage3,680
24Jan 13, 20058.86−6.14Below flood stage2,490
25Apr 18, 20065.84−9.16Below flood stage996

Henry County: every hazard · River floods across the country · Illinois

NOAA National Water Prediction Service, gauge GENI2, retrieved October 30, 2026. Stages in feet on the gauge's own datum, not elevation. Crests are as the National Weather Service lists them; preliminary values may be revised.