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Illinois River near Henry

Highest listed crest 32.94 ftFlood stage 23.0 ft94 crests since 1943

The Illinois River near Henry crested at major flood stage 7 times among the 94 crests the National Weather Service lists from 1943 to 2026. The highest, 32.94 ft on April 22, 2013, was major flooding, 9.94 feet above flood stage. 12 other gauges on the Illinois River crested above flood stage within a week of it, 9 at their own highest listed crest.

The gauge

Highest listed crest
32.94 ft
April 22, 2013
Flood stage
23.0 ft
Major flooding from 31.0 ft
Crests at major
7
39th of 177 gauges in Illinois
Most recent flood crest
July 7, 2026
23.12 ft, minor flooding
Location
Marshall County
Illinois

Flood stages

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

Flood categories, Illinois River near Henry
Action stage22.014Apr 7, 2026The level at which the NWS or its partners begin to take action
Flood stage (minor)23.013Jul 7, 2026Minimal or no property damage, but possibly some public threat
Moderate flood stage24.050Jun 24, 2026Some inundation of structures and roads near the stream
Major flood stage31.07May 21, 2020Extensive inundation of structures and roads

Every listed crest

94 crests from 1943 to 2026. Filled: at or above flood stage. Hover a crest for its date and stage.

Listed crests at the Illinois River near Henry, 1943 to 2026 1520253035ft Flood stage 23.0 ftMajor 31.0 ft May 23, 1943: 32.20 ft, major floodingMar 22, 1979: 32.67 ft, major floodingMar 22, 1982: 30.74 ft, moderate floodingDec 8, 1982: 30.70 ft, moderate floodingFeb 19, 1984: 24.68 ft, moderate floodingMar 23, 1984: 24.45 ft, moderate flooding; 53,700 cubic feet per secondMar 7, 1985: 32.02 ft, major floodingNov 23, 1985: 28.58 ft, moderate floodingOct 8, 1986: 24.13 ft, moderate floodingMay 22, 1987: 19.60 ft, below flood stageApr 7, 1988: 20.56 ft, below flood stageSep 11, 1989: 26.02 ft, moderate flooding; 45,000 cubic feet per secondMar 20, 1990: 26.96 ft, moderate floodingMar 22, 1991: 24.57 ft, moderate floodingSep 11, 1992: 17.21 ft, below flood stage; 30,900 cubic feet per secondApr 22, 1993: 26.75 ft, moderate floodingOct 24, 1994: 22.44 ft, action stageApr 13, 1995: 22.66 ft, action stageMay 29, 1995: 28.84 ft, moderate floodingMay 30, 1996: 24.91 ft, moderate floodingJun 3, 1996: 26.49 ft, moderate floodingFeb 23, 1997: 27.19 ft, moderate floodingMar 2, 1997: 30.56 ft, moderate floodingMar 25, 1998: 25.77 ft, moderate floodingMay 12, 1998: 27.38 ft, moderate floodingJan 25, 1999: 22.65 ft, action stageJan 30, 1999: 24.16 ft, moderate floodingApr 26, 1999: 23.84 ft, minor floodingApr 30, 1999: 23.83 ft, minor floodingJul 12, 2000: 20.80 ft, below flood stage; 40,400 cubic feet per secondFeb 12, 2001: 24.77 ft, moderate floodingMay 14, 2002: 26.67 ft, moderate flooding; 88,500 cubic feet per secondMay 18, 2002: 28.28 ft, moderate floodingMay 12, 2003: 19.53 ft, below flood stage; 38,400 cubic feet per secondJun 17, 2004: 23.30 ft, minor floodingJan 17, 2005: 27.93 ft, moderate floodingApr 19, 2006: 18.66 ft, below flood stage; 32,400 cubic feet per secondAug 26, 2007: 25.62 ft, moderate floodingJan 14, 2008: 27.00 ft, moderate floodingFeb 11, 2008: 23.91 ft, minor flooding; 38,600 cubic feet per secondFeb 19, 2008: 25.71 ft, moderate floodingMar 6, 2008: 22.99 ft, action stage; 40,300 cubic feet per secondSep 19, 2008: 30.98 ft, moderate flooding; 66,600 cubic feet per secondJan 1, 2009: 27.49 ft, moderate flooding; 49,200 cubic feet per secondMar 13, 2009: 31.49 ft, major flooding; 69,000 cubic feet per secondApr 9, 2009: 24.37 ft, moderate flooding; 40,100 cubic feet per secondMay 3, 2009: 26.02 ft, moderate flooding; 43,900 cubic feet per secondMay 19, 2009: 28.89 ft, moderate flooding; 47,000 cubic feet per secondNov 3, 2009: 24.54 ft, moderate flooding; 41,200 cubic feet per secondDec 28, 2009: 23.20 ft, minor flooding; 43,900 cubic feet per secondMar 17, 2010: 23.61 ft, minor flooding; 44,800 cubic feet per secondJun 27, 2010: 26.42 ft, moderate flooding; 49,300 cubic feet per secondApr 30, 2011: 26.39 ft, moderate flooding; 43,000 cubic feet per secondJun 1, 2011: 25.59 ft, moderate flooding; 54,300 cubic feet per secondJun 12, 2011: 24.37 ft, moderate flooding; 48,100 cubic feet per secondJun 23, 2011: 23.16 ft, minor flooding; 37,100 cubic feet per secondMar 14, 2013: 22.73 ft, action stage; 41,100 cubic feet per secondApr 22, 2013: 32.94 ft, major floodingJun 5, 2013: 25.73 ft, moderate flooding; 41,100 cubic feet per secondFeb 24, 2014: 24.13 ft, moderate flooding; 51,900 cubic feet per secondMar 17, 2014: 23.07 ft, minor flooding; 49,700 cubic feet per secondJul 4, 2014: 23.27 ft, minor flooding; 46,300 cubic feet per secondJun 30, 2015: 30.39 ft, moderate flooding; 69,700 cubic feet per secondJan 2, 2016: 29.78 ft, moderate flooding; 66,100 cubic feet per secondApr 9, 2017: 25.06 ft, moderate flooding; 56,100 cubic feet per secondMay 4, 2017: 26.95 ft, moderate flooding; 72,100 cubic feet per secondFeb 27, 2018: 29.21 ft, moderate flooding; 69,500 cubic feet per secondJun 25, 2018: 22.42 ft, action stage; 44,600 cubic feet per secondFeb 9, 2019: 24.61 ft, moderate floodingFeb 26, 2019: 22.62 ft, action stageMar 17, 2019: 22.44 ft, action stageMay 6, 2019: 31.35 ft, major floodingJun 1, 2019: 30.01 ft, moderate floodingJun 23, 2019: 23.16 ft, minor floodingJul 5, 2019: 23.15 ft, minor floodingOct 1, 2019: 24.58 ft, moderate floodingNov 3, 2019: 24.10 ft, moderate floodingJan 18, 2020: 22.57 ft, action stageMay 3, 2020: 25.25 ft, moderate floodingMay 21, 2020: 31.62 ft, major floodingJul 3, 2021: 24.18 ft, moderate flooding; 46,957 cubic feet per secondNov 1, 2021: 23.42 ft, minor floodingFeb 25, 2022: 22.60 ft, action stageApr 8, 2022: 22.84 ft, action stageMay 9, 2022: 21.20 ft, below flood stageMar 8, 2023: 21.36 ft, below flood stage; 34,600 cubic feet per secondApr 7, 2023: 21.01 ft, below flood stage; 27,000 cubic feet per secondJan 31, 2024: 25.55 ft, moderate flooding; 53,274 cubic feet per secondApr 9, 2024: 22.65 ft, action stage; 40,430 cubic feet per secondMay 2, 2024: 22.63 ft, action stage; 40,348 cubic feet per secondApr 7, 2026: 22.06 ft, action stageApr 21, 2026: 21.94 ft, below flood stageJun 24, 2026: 24.24 ft, moderate floodingJul 7, 2026: 23.12 ft, minor flooding Highest, 32.94 ft, Apr 22, 2013 1960198020002020

Crests at or above flood stage, by decade

Crests at or above flood stage per decade, Illinois River near Henry 1940s: 1 1950s: 0 1960s: 0 1970s: 1 1980s: 8 1990s: 13 2000s: 17 2010s: 23 23 2020s: 7 1940s1950s1960s1970s1980s1990s2000s2010s2020s
  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.

Highest crests

The 50 highest of 94 listed crests.

Highest listed crests, Illinois River near Henry
1Apr 22, 201332.94+9.94Major—
2Mar 22, 197932.67+9.67Major—
3May 23, 194332.20+9.20Major—
4Mar 7, 198532.02+9.02Major—
5May 21, 202031.62+8.62Major—
6Mar 13, 200931.49+8.49Major69,000
7May 6, 201931.35+8.35Major—
8Sep 19, 200830.98+7.98Moderate66,600
9Mar 22, 198230.74+7.74Moderate—
10Dec 8, 198230.70+7.70Moderate—
11Mar 2, 199730.56+7.56Moderate—
12Jun 30, 201530.39+7.39Moderate69,700
13Jun 1, 201930.01+7.01Moderate—
14Jan 2, 201629.78+6.78Moderate66,100
15Feb 27, 201829.21+6.21Moderate69,500
16May 19, 200928.89+5.89Moderate47,000
17May 29, 199528.84+5.84Moderate—
18Nov 23, 198528.58+5.58Moderate—
19May 18, 200228.28+5.28Moderate—
20Jan 17, 200527.93+4.93Moderate—
21Jan 1, 200927.49+4.49Moderate49,200
22May 12, 199827.38+4.38Moderate—
23Feb 23, 199727.19+4.19Moderate—
24Jan 14, 200827.00+4.00Moderate—
25Mar 20, 199026.96+3.96Moderate—
26May 4, 201726.95+3.95Moderate72,100
27Apr 22, 199326.75+3.75Moderate—
28May 14, 200226.67+3.67Moderate88,500
29Jun 3, 199626.49+3.49Moderate—
30Jun 27, 201026.42+3.42Moderate49,300
31Apr 30, 201126.39+3.39Moderate43,000
32Sep 11, 198926.02+3.02Moderate45,000
33May 3, 200926.02+3.02Moderate43,900
34Mar 25, 199825.77+2.77Moderate—
35Jun 5, 201325.73+2.73Moderate41,100
36Feb 19, 200825.71+2.71Moderate—
37Aug 26, 200725.62+2.62Moderate—
38Jun 1, 201125.59+2.59Moderate54,300
39Jan 31, 202425.55+2.55Moderate53,274
40May 3, 202025.25+2.25Moderate—
41Apr 9, 201725.06+2.06Moderate56,100
42May 30, 199624.91+1.91Moderate—
43Feb 12, 200124.77+1.77Moderate—
44Feb 19, 198424.68+1.68Moderate—
45Feb 9, 201924.61+1.61Moderate—
46Oct 1, 201924.58+1.58Moderate—
47Mar 22, 199124.57+1.57Moderate—
48Nov 3, 200924.54+1.54Moderate41,200
49Mar 23, 198424.45+1.45Moderate53,700
50Apr 9, 200924.37+1.37Moderate40,100

The worst floods along the Illinois River

For this gauge's highest crests, the other gauges on the Illinois River that crested above flood stage within a week.

April 22, 2013: 32.94 ft here, major flooding

March 22, 1979: 32.67 ft here, major flooding

May 23, 1943: 32.20 ft here, major flooding

Gauges on the Illinois River

Flood gauges sharing the river's name, linked within 80 miles of one another.

Flood gauges on the Illinois River
BeardstownIL14.029.81 ft, Apr 27, 201310
HardinIL25.042.40 ft, Aug 3, 199320
LaGrange Lock and DamIL23.034.66 ft, Jul 2, 201517
Marseilles Lock (tailwater)IL467.0476.72 ft, Apr 19, 20130
MeredosiaIL17.028.86 ft, Jul 2, 201523
MorrisIL16.024.91 ft, Apr 19, 201312
OttawaIL463.0473.72 ft, Apr 19, 20134
PeoriaIL18.029.35 ft, Apr 23, 20135
Peoria Lock and DamIL447.0456.57 ft, Apr 23, 20135
Starved Rock Lock (tailwater)IL450.0467.81 ft, Apr 19, 20133
Valley CityIL14.027.00 ft, May 26, 194317
HavanaIL14.027.78 ft, Apr 25, 201325
Henry this gaugeIL23.032.94 ft, Apr 22, 20137
La SalleIL20.034.44 ft, Apr 20, 20139

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

NOAA National Water Prediction Service, gauge HNYI2, 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.