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Sangamon River at Monticello

Highest listed crest 19.06 ftFlood stage 13.0 ft206 crests since 1908

The Sangamon River at Monticello crested above flood stage 134 times among the 206 crests the National Weather Service lists from 1908 to 2026. The highest, 19.06 ft on April 13, 1994, was moderate flooding, 6.06 feet above flood stage. 3 other gauges on the Sangamon River crested above flood stage within a week of it.

The gauge

Highest listed crest
19.06 ft
April 13, 1994; 15,900 cubic feet per second
Flood stage
13.0 ft
Major flooding from 20.0 ft
Crests at major
0
134 above flood stage
Most recent flood crest
August 18, 2026
17.37 ft, moderate flooding
Location
Piatt County
Illinois

Flood stages

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

Flood categories, Sangamon River at Monticello
Action stage11.051Apr 8, 2025The level at which the NWS or its partners begin to take action
Flood stage (minor)13.0117Jun 21, 2026Minimal or no property damage, but possibly some public threat
Moderate flood stage17.017Aug 18, 2026Some inundation of structures and roads near the stream
Major flood stage20.00—Extensive inundation of structures and roads

Every listed crest

206 crests from 1908 to 2026. Filled: at or above flood stage. Hover a crest for its date and stage.

Listed crests at the Sangamon River at Monticello, 1908 to 2026 8101214161820ft Flood stage 13.0 ftMajor 20.0 ft May 14, 1908: 15.36 ft, minor flooding; 9,600 cubic feet per secondJul 12, 1909: 15.12 ft, minor flooding; 9,120 cubic feet per secondJan 21, 1910: 10.23 ft, below flood stage; 2,120 cubic feet per secondJan 14, 1911: 10.40 ft, below flood stage; 1,040 cubic feet per secondMar 20, 1912: 14.31 ft, minor flooding; 7,840 cubic feet per secondMar 25, 1913: 17.70 ft, moderate flooding; 16,700 cubic feet per secondAug 1, 1915: 13.87 ft, minor flooding; 5,990 cubic feet per secondJan 31, 1916: 13.84 ft, minor flooding; 6,580 cubic feet per secondJun 9, 1917: 12.16 ft, action stage; 3,830 cubic feet per secondFeb 14, 1918: 14.50 ft, minor flooding; 8,100 cubic feet per secondJun 25, 1919: 15.20 ft, minor flooding; 9,020 cubic feet per secondApr 21, 1920: 15.17 ft, minor flooding; 9,750 cubic feet per secondSep 4, 1921: 10.50 ft, below flood stage; 1,860 cubic feet per secondApr 13, 1922: 13.45 ft, minor flooding; 5,880 cubic feet per secondMar 16, 1923: 13.42 ft, minor flooding; 5,840 cubic feet per secondAug 21, 1924: 13.41 ft, minor flooding; 5,820 cubic feet per secondMar 19, 1925: 10.80 ft, below flood stage; 2,160 cubic feet per secondApr 8, 1926: 13.40 ft, minor flooding; 5,800 cubic feet per secondOct 4, 1926: 18.50 ft, moderate flooding; 19,000 cubic feet per secondDec 1, 1927: 12.96 ft, action stage; 5,000 cubic feet per secondJul 7, 1929: 15.11 ft, minor flooding; 9,500 cubic feet per secondJan 4, 1930: 11.60 ft, action stage; 2,650 cubic feet per secondSep 19, 1931: 10.53 ft, below flood stage; 1,620 cubic feet per secondJan 19, 1932: 10.22 ft, below flood stage; 1,420 cubic feet per secondMay 12, 1933: 14.42 ft, minor flooding; 7,920 cubic feet per secondApr 1, 1934: 8.26 ft, below flood stage; 704 cubic feet per secondMay 12, 1935: 12.10 ft, action stage; 3,360 cubic feet per secondFeb 26, 1936: 14.22 ft, minor flooding; 7,400 cubic feet per secondJun 28, 1937: 12.37 ft, action stage; 3,800 cubic feet per secondApr 9, 1938: 12.86 ft, action stage; 4,720 cubic feet per secondMar 13, 1939: 15.99 ft, minor flooding; 11,900 cubic feet per secondMar 5, 1940: 11.88 ft, action stage; 2,870 cubic feet per secondJun 15, 1941: 10.89 ft, below flood stage; 1,640 cubic feet per secondFeb 6, 1942: 12.98 ft, action stage; 5,000 cubic feet per secondMay 18, 1943: 17.67 ft, moderate flooding; 16,600 cubic feet per secondApr 13, 1944: 15.26 ft, minor flooding; 10,000 cubic feet per secondJun 19, 1945: 12.09 ft, action stage; 3,290 cubic feet per secondJun 20, 1946: 12.96 ft, action stage; 5,000 cubic feet per secondMay 2, 1947: 12.62 ft, action stage; 4,050 cubic feet per secondMar 23, 1948: 12.68 ft, action stage; 3,640 cubic feet per secondFeb 15, 1949: 12.65 ft, action stage; 3,460 cubic feet per secondDec 23, 1949: 14.77 ft, minor floodingFeb 21, 1951: 15.00 ft, minor flooding; 9,100 cubic feet per secondJun 25, 1952: 12.52 ft, action stage; 3,350 cubic feet per secondApr 3, 1953: 12.17 ft, action stage; 2,820 cubic feet per secondJun 8, 1954: 13.04 ft, minor flooding; 4,320 cubic feet per secondMay 31, 1955: 10.88 ft, below flood stage; 1,370 cubic feet per secondMay 29, 1956: 16.56 ft, minor flooding; 13,600 cubic feet per secondApr 29, 1957: 14.48 ft, minor flooding; 7,850 cubic feet per secondJul 12, 1958: 14.65 ft, minor flooding; 4,880 cubic feet per secondFeb 10, 1959: 17.49 ft, moderate flooding; 11,200 cubic feet per secondJun 25, 1960: 13.70 ft, minor flooding; 3,510 cubic feet per secondMay 8, 1961: 17.40 ft, moderate flooding; 11,000 cubic feet per secondMar 23, 1962: 14.20 ft, minor flooding; 4,550 cubic feet per secondMar 7, 1963: 15.15 ft, minor flooding; 6,000 cubic feet per secondApr 22, 1964: 16.76 ft, minor flooding; 9,700 cubic feet per secondApr 9, 1965: 12.46 ft, action stage; 2,210 cubic feet per secondApr 25, 1966: 12.42 ft, action stage; 2,180 cubic feet per secondDec 10, 1966: 13.03 ft, minor flooding; 2,790 cubic feet per secondMay 16, 1968: 18.55 ft, moderate flooding; 14,000 cubic feet per secondJan 30, 1969: 13.98 ft, minor flooding; 3,920 cubic feet per secondApr 21, 1970: 14.55 ft, minor flooding; 5,420 cubic feet per secondJul 14, 1971: 12.73 ft, action stage; 2,780 cubic feet per secondApr 24, 1973: 15.14 ft, minor flooding; 6,580 cubic feet per secondJun 24, 1974: 15.59 ft, minor flooding; 7,480 cubic feet per secondMar 7, 1976: 13.40 ft, minor flooding; 3,780 cubic feet per secondAug 10, 1977: 15.43 ft, minor flooding; 5,950 cubic feet per secondDec 19, 1977: 12.67 ft, action stage; 2,600 cubic feet per secondMar 6, 1979: 17.27 ft, moderate flooding; 9,770 cubic feet per secondJun 5, 1980: 16.42 ft, minor flooding; 7,410 cubic feet per secondJul 29, 1981: 14.07 ft, minor flooding; 4,110 cubic feet per secondFeb 25, 1982: 15.54 ft, minor flooding; 6,890 cubic feet per secondMay 2, 1983: 16.04 ft, minor flooding; 8,000 cubic feet per secondFeb 25, 1985: 15.98 ft, minor flooding; 7,790 cubic feet per secondNov 21, 1985: 17.31 ft, moderate flooding; 10,100 cubic feet per secondMay 28, 1989: 14.36 ft, minor flooding; 4,410 cubic feet per secondMay 16, 1990: 17.09 ft, moderate flooding; 10,800 cubic feet per secondDec 31, 1990: 17.71 ft, moderate flooding; 9,220 cubic feet per secondJul 11, 1992: 13.01 ft, minor flooding; 2,870 cubic feet per secondJan 6, 1993: 15.85 ft, minor flooding; 6,520 cubic feet per secondApr 13, 1994: 19.06 ft, moderate flooding; 15,900 cubic feet per secondMay 12, 1996: 15.56 ft, minor flooding; 5,850 cubic feet per secondMay 28, 1996: 13.53 ft, minor flooding; 2,710 cubic feet per secondFeb 24, 1997: 13.47 ft, minor flooding; 2,690 cubic feet per secondMar 1, 1997: 14.42 ft, minor flooding; 3,900 cubic feet per secondMay 30, 1997: 12.75 ft, action stage; 2,180 cubic feet per secondMar 21, 1998: 14.94 ft, minor floodingMar 29, 1998: 13.13 ft, minor floodingMay 4, 1998: 15.11 ft, minor floodingMay 10, 1998: 14.37 ft, minor floodingJun 15, 1998: 14.41 ft, minor floodingJun 19, 1998: 15.56 ft, minor flooding; 6,510 cubic feet per secondJan 25, 1999: 13.22 ft, minor floodingFeb 9, 1999: 12.20 ft, action stageApr 19, 1999: 13.73 ft, minor flooding; 3,610 cubic feet per secondMay 29, 2000: 11.82 ft, action stage; 1,680 cubic feet per secondFeb 27, 2001: 15.38 ft, minor flooding; 6,170 cubic feet per secondMay 14, 2002: 15.77 ft, minor flooding; 5,670 cubic feet per secondJul 13, 2003: 13.99 ft, minor flooding; 2,900 cubic feet per secondNov 22, 2003: 13.37 ft, minor floodingMar 27, 2004: 14.89 ft, minor flooding; 5,310 cubic feet per secondApr 1, 2004: 14.10 ft, minor floodingJun 4, 2004: 13.80 ft, minor floodingJun 15, 2004: 14.00 ft, minor floodingDec 1, 2004: 14.12 ft, minor floodingDec 10, 2004: 14.30 ft, minor floodingJan 7, 2005: 14.94 ft, minor floodingJan 15, 2005: 17.77 ft, moderate flooding; 11,100 cubic feet per secondFeb 16, 2005: 13.10 ft, minor floodingJul 27, 2006: 13.36 ft, minor flooding; 2,410 cubic feet per secondDec 25, 2006: 14.06 ft, minor flooding; 3,180 cubic feet per secondJan 10, 2008: 17.25 ft, moderate flooding; 9,370 cubic feet per secondFeb 6, 2008: 17.88 ft, moderate flooding; 11,300 cubic feet per secondJun 4, 2008: 18.79 ft, moderate flooding; 13,300 cubic feet per secondDec 30, 2008: 15.39 ft, minor flooding; 5,020 cubic feet per secondFeb 14, 2009: 12.29 ft, action stage; 1,610 cubic feet per secondMar 13, 2009: 14.06 ft, minor flooding; 3,190 cubic feet per secondMay 4, 2009: 13.21 ft, minor flooding; 2,330 cubic feet per secondMay 16, 2009: 15.50 ft, minor flooding; 5,690 cubic feet per secondOct 27, 2009: 13.89 ft, minor flooding; 3,190 cubic feet per secondNov 2, 2009: 15.30 ft, minor flooding; 5,320 cubic feet per secondNov 18, 2009: 13.63 ft, minor flooding; 2,880 cubic feet per secondDec 27, 2009: 14.34 ft, minor flooding; 3,780 cubic feet per secondJan 26, 2010: 13.45 ft, minor flooding; 2,680 cubic feet per secondJun 20, 2010: 15.74 ft, minor flooding; 6,170 cubic feet per secondMar 2, 2011: 11.96 ft, action stage; 1,420 cubic feet per secondMar 7, 2011: 12.62 ft, action stage; 1,890 cubic feet per secondApr 28, 2011: 14.58 ft, minor flooding; 4,040 cubic feet per secondMay 29, 2011: 15.18 ft, minor flooding; 4,980 cubic feet per secondMay 9, 2012: 9.96 ft, below flood stage; 769 cubic feet per secondApr 13, 2013: 13.23 ft, minor flooding; 2,470 cubic feet per secondApr 19, 2013: 16.49 ft, minor flooding; 7,700 cubic feet per secondJun 3, 2013: 13.12 ft, minor flooding; 2,360 cubic feet per secondJun 26, 2013: 16.38 ft, minor flooding; 7,450 cubic feet per secondFeb 24, 2014: 14.40 ft, minor flooding; 4,540 cubic feet per secondJul 4, 2014: 13.46 ft, minor flooding; 2,930 cubic feet per secondJul 15, 2014: 16.72 ft, minor flooding; 8,760 cubic feet per secondJun 11, 2015: 14.81 ft, minor flooding; 4,830 cubic feet per secondJun 28, 2015: 14.43 ft, minor flooding; 4,240 cubic feet per secondJul 12, 2015: 14.80 ft, minor flooding; 4,820 cubic feet per secondDec 29, 2015: 18.56 ft, moderate flooding; 13,800 cubic feet per secondMay 14, 2016: 13.50 ft, minor flooding; 2,540 cubic feet per secondJan 23, 2017: 13.34 ft, minor flooding; 2,580 cubic feet per secondApr 9, 2017: 13.24 ft, minor flooding; 2,480 cubic feet per secondMay 5, 2017: 14.36 ft, minor flooding; 3,810 cubic feet per secondFeb 23, 2018: 16.49 ft, minor flooding; 7,700 cubic feet per secondMar 30, 2018: 13.40 ft, minor flooding; 2,640 cubic feet per secondJun 1, 2018: 11.02 ft, action stage; 1,100 cubic feet per secondJun 13, 2018: 13.32 ft, minor flooding; 2,560 cubic feet per secondJun 24, 2018: 13.21 ft, minor flooding; 2,450 cubic feet per secondDec 5, 2018: 12.17 ft, action stage; 1,570 cubic feet per secondJan 2, 2019: 13.85 ft, minor flooding; 3,150 cubic feet per secondFeb 8, 2019: 13.89 ft, minor flooding; 3,200 cubic feet per secondFeb 26, 2019: 11.71 ft, action stage; 1,350 cubic feet per secondMar 12, 2019: 12.91 ft, action stage; 2,160 cubic feet per secondApr 2, 2019: 14.06 ft, minor flooding; 3,410 cubic feet per secondApr 19, 2019: 12.80 ft, action stage; 2,070 cubic feet per secondMay 3, 2019: 15.99 ft, minor flooding; 6,600 cubic feet per secondMay 10, 2019: 12.81 ft, action stage; 2,080 cubic feet per secondJun 1, 2019: 12.07 ft, action stage; 1,500 cubic feet per secondJan 15, 2020: 13.67 ft, minor flooding; 2,940 cubic feet per secondJan 19, 2020: 12.52 ft, action stage; 1,830 cubic feet per secondFeb 19, 2020: 12.79 ft, action stage; 2,060 cubic feet per secondFeb 28, 2020: 11.53 ft, action stage; 1,300 cubic feet per secondMar 22, 2020: 13.30 ft, minor flooding; 2,540 cubic feet per secondApr 30, 2020: 13.84 ft, minor flooding; 3,130 cubic feet per secondMay 20, 2020: 15.28 ft, minor flooding; 4,760 cubic feet per secondJun 7, 2020: 13.93 ft, minor flooding; 2,900 cubic feet per secondJun 24, 2020: 11.24 ft, action stage; 1,190 cubic feet per secondMar 22, 2021: 12.33 ft, action stage; 1,680 cubic feet per secondMar 28, 2021: 11.45 ft, action stage; 1,260 cubic feet per secondMay 1, 2021: 10.92 ft, below flood stage; 1,100 cubic feet per secondMay 13, 2021: 12.67 ft, action stage; 1,950 cubic feet per secondJun 30, 2021: 15.77 ft, minor flooding; 5,910 cubic feet per secondJul 21, 2021: 13.10 ft, minor flooding; 2,260 cubic feet per secondAug 15, 2021: 16.10 ft, minor flooding; 6,340 cubic feet per secondOct 17, 2021: 11.48 ft, action stage; 1,290 cubic feet per secondOct 27, 2021: 16.51 ft, minor flooding; 7,750 cubic feet per secondFeb 25, 2022: 13.23 ft, minor flooding; 2,470 cubic feet per secondMar 8, 2022: 11.34 ft, action stage; 1,230 cubic feet per secondMar 26, 2022: 10.66 ft, below flood stage; 1,020 cubic feet per secondApr 2, 2022: 13.71 ft, minor flooding; 2,980 cubic feet per secondApr 15, 2022: 10.19 ft, below flood stage; 940 cubic feet per secondApr 26, 2022: 11.50 ft, action stage; 1,300 cubic feet per secondMay 8, 2022: 11.53 ft, action stage; 1,300 cubic feet per secondFeb 26, 2023: 14.27 ft, minor flooding; 3,690 cubic feet per secondMar 7, 2023: 13.17 ft, minor flooding; 2,410 cubic feet per secondMar 27, 2023: 11.51 ft, action stage; 1,320 cubic feet per secondApr 2, 2023: 11.88 ft, action stage; 1,410 cubic feet per secondMay 8, 2023: 11.73 ft, action stage; 1,370 cubic feet per secondJan 15, 2024: 12.82 ft, action stage; 2,090 cubic feet per secondJan 27, 2024: 14.46 ft, minor flooding; 3,950 cubic feet per secondMar 11, 2024: 12.07 ft, action stage; 1,500 cubic feet per secondApr 4, 2024: 10.87 ft, below flood stage; 1,080 cubic feet per secondMay 2, 2024: 12.78 ft, action stage; 2,050 cubic feet per secondMay 28, 2024: 10.99 ft, below flood stage; 1,120 cubic feet per secondJun 6, 2024: 11.35 ft, action stage; 1,230 cubic feet per secondJan 2, 2025: 10.14 ft, below flood stage; 871 cubic feet per secondApr 8, 2025: 12.93 ft, action stage; 2,170 cubic feet per secondJun 8, 2025: 10.57 ft, below flood stage; 1,040 cubic feet per secondApr 30, 2026: 10.59 ft, below flood stage; 1,050 cubic feet per secondJun 21, 2026: 14.70 ft, minor flooding; 4,240 cubic feet per secondJul 1, 2026: 10.94 ft, below flood stage; 1,140 cubic feet per secondJul 5, 2026: 10.45 ft, below flood stage; 1,010 cubic feet per secondJul 12, 2026: 10.94 ft, below flood stage; 1,140 cubic feet per secondAug 18, 2026: 17.37 ft, moderate flooding; 9,750 cubic feet per second Highest, 19.06 ft, Apr 13, 1994 192019401960198020002020

Crests at or above flood stage, by decade

Crests at or above flood stage per decade, Sangamon River at Monticello 1900s: 2 1910s: 6 1920s: 7 1930s: 3 1940s: 3 1950s: 6 1960s: 8 1970s: 6 1980s: 7 1990s: 17 2000s: 26 2010s: 27 27 2020s: 16 1900s1910s1920s1930s1940s1950s1960s1970s1980s1990s2000s2010s2020s
  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 206 listed crests.

Highest listed crests, Sangamon River at Monticello
1Apr 13, 199419.06+6.06Moderate15,900
2Jun 4, 200818.79+5.79Moderate13,300
3Dec 29, 201518.56+5.56Moderate13,800
4May 16, 196818.55+5.55Moderate14,000
5Oct 4, 192618.50+5.50Moderate19,000
6Feb 6, 200817.88+4.88Moderate11,300
7Jan 15, 200517.77+4.77Moderate11,100
8Dec 31, 199017.71+4.71Moderate9,220
9Mar 25, 191317.70+4.70Moderate16,700
10May 18, 194317.67+4.67Moderate16,600
11Feb 10, 195917.49+4.49Moderate11,200
12May 8, 196117.40+4.40Moderate11,000
13Aug 18, 202617.37+4.37Moderate9,750
14Nov 21, 198517.31+4.31Moderate10,100
15Mar 6, 197917.27+4.27Moderate9,770
16Jan 10, 200817.25+4.25Moderate9,370
17May 16, 199017.09+4.09Moderate10,800
18Apr 22, 196416.76+3.76Minor9,700
19Jul 15, 201416.72+3.72Minor8,760
20May 29, 195616.56+3.56Minor13,600
21Oct 27, 202116.51+3.51Minor7,750
22Apr 19, 201316.49+3.49Minor7,700
23Feb 23, 201816.49+3.49Minor7,700
24Jun 5, 198016.42+3.42Minor7,410
25Jun 26, 201316.38+3.38Minor7,450
26Aug 15, 202116.10+3.10Minor6,340
27May 2, 198316.04+3.04Minor8,000
28Mar 13, 193915.99+2.99Minor11,900
29May 3, 201915.99+2.99Minor6,600
30Feb 25, 198515.98+2.98Minor7,790
31Jan 6, 199315.85+2.85Minor6,520
32May 14, 200215.77+2.77Minor5,670
33Jun 30, 202115.77+2.77Minor5,910
34Jun 20, 201015.74+2.74Minor6,170
35Jun 24, 197415.59+2.59Minor7,480
36May 12, 199615.56+2.56Minor5,850
37Jun 19, 199815.56+2.56Minor6,510
38Feb 25, 198215.54+2.54Minor6,890
39May 16, 200915.50+2.50Minor5,690
40Aug 10, 197715.43+2.43Minor5,950
41Dec 30, 200815.39+2.39Minor5,020
42Feb 27, 200115.38+2.38Minor6,170
43May 14, 190815.36+2.36Minor9,600
44Nov 2, 200915.30+2.30Minor5,320
45May 20, 202015.28+2.28Minor4,760
46Apr 13, 194415.26+2.26Minor10,000
47Jun 25, 191915.20+2.20Minor9,020
48May 29, 201115.18+2.18Minor4,980
49Apr 21, 192015.17+2.17Minor9,750
50Mar 7, 196315.15+2.15Minor6,000

The worst floods along the Sangamon River

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

April 13, 1994: 19.06 ft here, moderate flooding

  • OakfordIL · Apr 15, 1994 · 476.09 ft · Moderate
  • PetersburgIL · Apr 14, 1994 · 29.84 ft · Moderate
  • RivertonIL · Apr 13, 1994 · 28.28 ft · Moderate

June 4, 2008: 18.79 ft here, moderate flooding

  • OakfordIL · Jun 11, 2008 · 474.17 ft · Moderate
  • ChandlervilleIL · Jun 11, 2008 · 461.03 ft · Moderate
  • RivertonIL · Jun 8, 2008 · 27.17 ft · Moderate

December 29, 2015: 18.56 ft here, moderate flooding

  • ChandlervilleIL · Jan 2, 2016 · 463.20 ft · Major · its highest
  • RivertonIL · Dec 31, 2015 · 30.13 ft · Major
  • OakfordIL · Jan 1, 2016 · 477.67 ft · Moderate
  • PetersburgIL · Dec 31, 2015 · 30.55 ft · Moderate

Gauges on the Sangamon River

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

Flood gauges on the Sangamon River
Monticello this gaugeIL13.019.06 ft, Apr 13, 19940
PetersburgIL23.033.90 ft, May 20, 19431
RivertonIL23.031.52 ft, May 19, 19433
ChandlervilleIL456.6463.20 ft, Jan 2, 20162
OakfordIL471.0478.51 ft, May 20, 19431

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

NOAA National Water Prediction Service, gauge MNTI2, 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.