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Iroquois River at Iroquois

Highest listed crest 26.31 ftFlood stage 18.0 ft64 crests since 1945

The Iroquois River at Iroquois crested at major flood stage 6 times among the 64 crests the National Weather Service lists from 1945 to 2020. The highest, 26.31 ft on June 13, 1958, was major flooding, 8.31 feet above flood stage. 3 other gauges on the Iroquois River crested above flood stage within a week of it.

The gauge

Highest listed crest
26.31 ft
June 13, 1958; 10,400 cubic feet per second
Flood stage
18.0 ft
Major flooding from 25.0 ft
Crests at major
6
48th of 177 gauges in Illinois
Most recent flood crest
June 28, 2020
22.03 ft, minor flooding
Location
Iroquois County
Illinois

Flood stages

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

Flood categories, Iroquois River at Iroquois
Action stage17.05May 19, 2020The level at which the NWS or its partners begin to take action
Flood stage (minor)18.050Jun 28, 2020Minimal or no property damage, but possibly some public threat
Moderate flood stage24.02Mar 11, 2009Some inundation of structures and roads near the stream
Major flood stage25.06Feb 22, 2018Extensive inundation of structures and roads

Every listed crest

64 crests from 1945 to 2020. Filled: at or above flood stage. Hover a crest for its date and stage.

Listed crests at the Iroquois River at Iroquois, 1945 to 2020 1015202530ft Flood stage 18.0 ftMajor 25.0 ft May 20, 1945: 18.27 ft, minor flooding; 3,570 cubic feet per secondApr 6, 1950: 20.54 ft, minor flooding; 4,740 cubic feet per secondJul 10, 1951: 23.30 ft, minor flooding; 6,460 cubic feet per secondMar 19, 1953: 15.60 ft, below flood stage; 2,610 cubic feet per secondMay 2, 1956: 19.01 ft, minor flooding; 3,990 cubic feet per secondJul 13, 1957: 22.79 ft, minor flooding; 5,600 cubic feet per secondJun 13, 1958: 26.31 ft, major flooding; 10,400 cubic feet per secondFeb 13, 1959: 22.51 ft, minor flooding; 5,400 cubic feet per secondApr 1, 1960: 18.21 ft, minor flooding; 3,580 cubic feet per secondMar 23, 1962: 19.29 ft, minor flooding; 4,000 cubic feet per secondMar 7, 1963: 21.49 ft, minor flooding; 5,150 cubic feet per secondDec 28, 1966: 19.14 ft, minor flooding; 3,620 cubic feet per secondFeb 2, 1968: 23.35 ft, minor flooding; 6,390 cubic feet per secondFeb 1, 1969: 18.66 ft, minor flooding; 3,700 cubic feet per secondMay 15, 1970: 22.28 ft, minor flooding; 5,400 cubic feet per secondApr 24, 1973: 18.96 ft, minor flooding; 3,580 cubic feet per secondJan 24, 1974: 20.22 ft, minor flooding; 4,210 cubic feet per secondJun 17, 1975: 19.49 ft, minor flooding; 3,850 cubic feet per secondFeb 19, 1976: 19.53 ft, minor flooding; 3,860 cubic feet per secondMar 21, 1978: 20.49 ft, minor flooding; 4,340 cubic feet per secondMar 5, 1979: 23.81 ft, minor flooding; 6,910 cubic feet per secondJun 3, 1980: 20.04 ft, minor flooding; 4,570 cubic feet per secondMay 18, 1981: 20.45 ft, minor flooding; 4,780 cubic feet per secondFeb 24, 1982: 22.56 ft, minor flooding; 6,090 cubic feet per secondMay 4, 1983: 19.83 ft, minor flooding; 4,470 cubic feet per secondFeb 15, 1984: 19.86 ft, minor flooding; 4,480 cubic feet per secondFeb 25, 1985: 22.46 ft, minor flooding; 6,020 cubic feet per secondNov 21, 1985: 20.20 ft, minor flooding; 4,650 cubic feet per secondSep 2, 1989: 18.25 ft, minor flooding; 3,670 cubic feet per secondMar 13, 1990: 23.46 ft, minor flooding; 6,400 cubic feet per secondDec 30, 1990: 24.59 ft, moderate flooding; 7,720 cubic feet per secondJan 7, 1993: 22.29 ft, minor flooding; 5,560 cubic feet per secondOct 21, 1993: 23.35 ft, minor floodingMay 28, 1995: 20.10 ft, minor flooding; 4,250 cubic feet per secondMay 30, 1996: 17.28 ft, action stage; 2,970 cubic feet per secondFeb 28, 1997: 21.94 ft, minor flooding; 6,030 cubic feet per secondMay 9, 1998: 21.96 ft, minor flooding; 5,110 cubic feet per secondJan 26, 1999: 20.53 ft, minor flooding; 4,890 cubic feet per secondJul 4, 2000: 18.58 ft, minor flooding; 3,660 cubic feet per secondJun 6, 2001: 19.76 ft, minor flooding; 4,350 cubic feet per secondMay 14, 2002: 19.95 ft, minor flooding; 4,470 cubic feet per secondJul 12, 2003: 25.74 ft, major flooding; 9,920 cubic feet per secondJun 13, 2004: 22.74 ft, minor flooding; 6,740 cubic feet per secondJan 14, 2005: 23.54 ft, minor flooding; 6,280 cubic feet per secondApr 19, 2006: 17.30 ft, action stage; 3,030 cubic feet per secondMar 25, 2007: 20.40 ft, minor flooding; 4,280 cubic feet per secondJan 9, 2008: 25.81 ft, major flooding; 9,590 cubic feet per secondMar 11, 2009: 24.80 ft, moderate flooding; 8,150 cubic feet per secondJun 25, 2010: 18.17 ft, minor flooding; 3,360 cubic feet per secondApr 29, 2011: 21.83 ft, minor flooding; 5,790 cubic feet per secondMay 8, 2012: 17.91 ft, action stage; 3,260 cubic feet per secondJun 2, 2013: 21.89 ft, minor flooding; 4,950 cubic feet per secondJun 21, 2015: 25.27 ft, major flooding; 9,060 cubic feet per secondJul 12, 2015: 25.16 ft, major flooding; 8,910 cubic feet per secondDec 29, 2015: 23.07 ft, minor flooding; 6,700 cubic feet per secondAug 21, 2016: 18.20 ft, minor flooding; 3,660 cubic feet per secondApr 8, 2017: 18.26 ft, minor flooding; 3,560 cubic feet per secondMay 5, 2017: 18.69 ft, minor flooding; 3,472 cubic feet per secondFeb 22, 2018: 26.17 ft, major flooding; 9,900 cubic feet per secondFeb 8, 2019: 17.89 ft, action stage; 3,360 cubic feet per secondMay 3, 2019: 20.59 ft, minor flooding; 4,650 cubic feet per secondJan 14, 2020: 19.10 ft, minor flooding; 3,850 cubic feet per secondMay 19, 2020: 17.25 ft, action stage; 2,910 cubic feet per secondJun 28, 2020: 22.03 ft, minor flooding; 5,710 cubic feet per second Highest, 26.31 ft, Jun 13, 1958 19501960197019801990200020102020

Crests at or above flood stage, by decade

Crests at or above flood stage per decade, Iroquois River at Iroquois 1940s: 1 1950s: 6 1960s: 6 1970s: 7 1980s: 8 1990s: 8 2000s: 9 2010s: 11 11 2020s: 2 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 64 listed crests.

Highest listed crests, Iroquois River at Iroquois
1Jun 13, 195826.31+8.31Major10,400
2Feb 22, 201826.17+8.17Major9,900
3Jan 9, 200825.81+7.81Major9,590
4Jul 12, 200325.74+7.74Major9,920
5Jun 21, 201525.27+7.27Major9,060
6Jul 12, 201525.16+7.16Major8,910
7Mar 11, 200924.80+6.80Moderate8,150
8Dec 30, 199024.59+6.59Moderate7,720
9Mar 5, 197923.81+5.81Minor6,910
10Jan 14, 200523.54+5.54Minor6,280
11Mar 13, 199023.46+5.46Minor6,400
12Feb 2, 196823.35+5.35Minor6,390
13Oct 21, 199323.35+5.35Minor—
14Jul 10, 195123.30+5.30Minor6,460
15Dec 29, 201523.07+5.07Minor6,700
16Jul 13, 195722.79+4.79Minor5,600
17Jun 13, 200422.74+4.74Minor6,740
18Feb 24, 198222.56+4.56Minor6,090
19Feb 13, 195922.51+4.51Minor5,400
20Feb 25, 198522.46+4.46Minor6,020
21Jan 7, 199322.29+4.29Minor5,560
22May 15, 197022.28+4.28Minor5,400
23Jun 28, 202022.03+4.03Minor5,710
24May 9, 199821.96+3.96Minor5,110
25Feb 28, 199721.94+3.94Minor6,030
26Jun 2, 201321.89+3.89Minor4,950
27Apr 29, 201121.83+3.83Minor5,790
28Mar 7, 196321.49+3.49Minor5,150
29May 3, 201920.59+2.59Minor4,650
30Apr 6, 195020.54+2.54Minor4,740
31Jan 26, 199920.53+2.53Minor4,890
32Mar 21, 197820.49+2.49Minor4,340
33May 18, 198120.45+2.45Minor4,780
34Mar 25, 200720.40+2.40Minor4,280
35Jan 24, 197420.22+2.22Minor4,210
36Nov 21, 198520.20+2.20Minor4,650
37May 28, 199520.10+2.10Minor4,250
38Jun 3, 198020.04+2.04Minor4,570
39May 14, 200219.95+1.95Minor4,470
40Feb 15, 198419.86+1.86Minor4,480
41May 4, 198319.83+1.83Minor4,470
42Jun 6, 200119.76+1.76Minor4,350
43Feb 19, 197619.53+1.53Minor3,860
44Jun 17, 197519.49+1.49Minor3,850
45Mar 23, 196219.29+1.29Minor4,000
46Dec 28, 196619.14+1.14Minor3,620
47Jan 14, 202019.10+1.10Minor3,850
48May 2, 195619.01+1.01Minor3,990
49Apr 24, 197318.96+0.96Minor3,580
50May 5, 201718.69+0.69Minor3,472

The worst floods along the Iroquois River

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

June 13, 1958: 26.31 ft here, major flooding

  • ForesmanIN · Jun 14, 1958 · 24.42 ft · Major
  • RensselaerIN · Jun 10, 1958 · 16.54 ft · Major
  • ChebanseIL · Jun 15, 1958 · 18.06 ft · Moderate

February 22, 2018: 26.17 ft here, major flooding

  • ForesmanIN · Feb 22, 2018 · 24.39 ft · Major
  • ChebanseIL · Feb 23, 2018 · 20.60 ft · Major
  • RensselaerIN · Feb 22, 2018 · 17.04 ft · Major · its highest

January 9, 2008: 25.81 ft here, major flooding

  • ForesmanIN · Jan 10, 2008 · 24.16 ft · Major
  • ChebanseIL · Jan 11, 2008 · 20.14 ft · Major
  • RensselaerIN · Jan 10, 2008 · 15.11 ft · Major

Gauges on the Iroquois River

In USGS station-number order, which runs downstream within a river basin.

Flood gauges on the Iroquois River
RensselaerIN12.017.04 ft, Feb 22, 201810
ForesmanIN18.024.87 ft, Jul 11, 20034
Iroquois this gaugeIL18.026.31 ft, Jun 13, 19586
ChebanseIL16.021.68 ft, Mar 7, 19793

Other gauges in Iroquois County

Flood gauges in Iroquois County
Milford18.028.66 ft, Jan 8, 20084

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

NOAA National Water Prediction Service, gauge IRQI2, 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.