Highest listed crest 33.18 ft June 17, 1998; 65,100 cubic feet per second
Flood stage 25.0 ft Major flooding from 33.0 ft
Crests at major 1 93rd of 203 gauges in Iowa
Most recent flood crest March 16, 2019 31.07 ft, moderate flooding Listed crests at the Nishnabotna River above Hamburg, 1930 to 2024 0 10 20 30 40 ft Flood stage 25.0 ft Major 33.0 ft Feb 8, 1930: 13.80 ft, below flood stage; 3,020 cubic feet per second Jun 22, 1931: 18.10 ft, below flood stage; 9,350 cubic feet per second Nov 25, 1931: 19.10 ft, below flood stage; 11,100 cubic feet per second Jan 22, 1933: 17.10 ft, below flood stage; 8,020 cubic feet per second Jun 9, 1934: 14.60 ft, below flood stage; 5,620 cubic feet per second Jun 26, 1935: 17.50 ft, below flood stage; 8,500 cubic feet per second Mar 5, 1936: 22.20 ft, below flood stage; 20,600 cubic feet per second Mar 5, 1937: 21.60 ft, below flood stage; 16,500 cubic feet per second Sep 14, 1938: 18.20 ft, below flood stage; 9,650 cubic feet per second Mar 12, 1939: 23.00 ft, action stage; 22,100 cubic feet per second Aug 12, 1940: 18.90 ft, below flood stage; 10,700 cubic feet per second Jun 9, 1941: 20.40 ft, below flood stage; 14,600 cubic feet per second Jun 20, 1942: 19.20 ft, below flood stage; 11,700 cubic feet per second May 16, 1943: 19.10 ft, below flood stage; 11,100 cubic feet per second Jun 15, 1944: 20.80 ft, below flood stage; 11,800 cubic feet per second May 23, 1945: 22.60 ft, below flood stage; 21,000 cubic feet per second Sep 4, 1946: 19.70 ft, below flood stage; 11,300 cubic feet per second Mar 20, 1948: 24.50 ft, action stage; 36,300 cubic feet per second Mar 7, 1949: 25.90 ft, minor flooding; 32,200 cubic feet per second May 10, 1950: 22.50 ft, below flood stage; 19,900 cubic feet per second May 2, 1951: 24.51 ft, action stage; 23,800 cubic feet per second Jun 23, 1952: 20.92 ft, below flood stage; 12,800 cubic feet per second Jun 9, 1953: 14.65 ft, below flood stage; 5,440 cubic feet per second Aug 23, 1954: 21.32 ft, below flood stage; 12,600 cubic feet per second Apr 24, 1955: 18.80 ft, below flood stage; 12,000 cubic feet per second Jul 8, 1956: 20.90 ft, below flood stage; 13,500 cubic feet per second Jun 16, 1957: 21.59 ft, below flood stage; 20,400 cubic feet per second Jul 6, 1958: 22.75 ft, below flood stage; 14,600 cubic feet per second May 29, 1959: 21.70 ft, below flood stage; 15,400 cubic feet per second Mar 31, 1960: 24.56 ft, action stage; 23,900 cubic feet per second Mar 13, 1961: 21.33 ft, below flood stage; 14,400 cubic feet per second May 29, 1962: 23.62 ft, action stage; 18,000 cubic feet per second Mar 12, 1963: 22.02 ft, below flood stage; 15,600 cubic feet per second May 26, 1964: 23.32 ft, action stage; 19,900 cubic feet per second Mar 2, 1965: 24.83 ft, action stage; 24,700 cubic feet per second Jun 26, 1966: 22.00 ft, below flood stage; 16,000 cubic feet per second Jun 10, 1967: 24.53 ft, action stage; 20,000 cubic feet per second Jun 27, 1968: 8.85 ft, below flood stage; 798 cubic feet per second Mar 18, 1969: 24.19 ft, action stage; 19,700 cubic feet per second May 14, 1970: 19.12 ft, below flood stage; 10,400 cubic feet per second Feb 20, 1971: 26.03 ft, minor flooding; 25,000 cubic feet per second Sep 15, 1972: 27.42 ft, minor flooding; 25,200 cubic feet per second Sep 27, 1973: 23.45 ft, action stage; 17,900 cubic feet per second Oct 12, 1973: 23.07 ft, action stage; 16,300 cubic feet per second Apr 28, 1975: 21.63 ft, below flood stage; 13,300 cubic feet per second Jun 14, 1976: 25.70 ft, minor flooding; 21,400 cubic feet per second Sep 4, 1977: 23.24 ft, action stage; 12,200 cubic feet per second Sep 15, 1978: 25.17 ft, minor flooding; 20,500 cubic feet per second Mar 7, 1979: 27.46 ft, minor flooding Jun 4, 1980: 24.93 ft, action stage; 19,800 cubic feet per second Jul 9, 1981: 13.29 ft, below flood stage; 3,190 cubic feet per second Jun 15, 1982: 27.25 ft, minor flooding; 29,100 cubic feet per second Feb 20, 1983: 20.88 ft, below flood stage; 12,700 cubic feet per second Jun 16, 1984: 27.90 ft, moderate flooding; 24,300 cubic feet per second Feb 22, 1985: 21.90 ft, below flood stage; 12,300 cubic feet per second Feb 27, 1986: 23.87 ft, action stage; 18,300 cubic feet per second May 27, 1987: 28.14 ft, moderate flooding; 31,400 cubic feet per second Jan 31, 1988: 17.93 ft, below flood stage; 4,580 cubic feet per second Sep 10, 1989: 28.27 ft, moderate flooding; 32,900 cubic feet per second Jul 27, 1990: 28.06 ft, moderate flooding; 32,000 cubic feet per second Jun 15, 1991: 26.75 ft, minor flooding; 27,300 cubic feet per second Sep 16, 1992: 21.54 ft, below flood stage; 12,700 cubic feet per second Jul 25, 1993: 30.56 ft, moderate flooding; 37,700 cubic feet per second Jun 23, 1994: 25.13 ft, minor flooding; 22,000 cubic feet per second May 10, 1995: 22.86 ft, below flood stage; 15,600 cubic feet per second Jun 22, 1996: 28.45 ft, moderate flooding; 24,300 cubic feet per second Feb 19, 1997: 25.50 ft, minor flooding; 18,000 cubic feet per second Jun 17, 1998: 33.18 ft, major flooding; 65,100 cubic feet per second Aug 8, 1999: 28.83 ft, moderate flooding; 25,800 cubic feet per second Jun 14, 2000: 16.33 ft, below flood stage; 4,710 cubic feet per second Mar 15, 2001: 24.48 ft, action stage; 14,300 cubic feet per second May 13, 2002: 13.71 ft, below flood stage; 3,230 cubic feet per second May 6, 2003: 19.40 ft, below flood stage; 7,140 cubic feet per second May 26, 2004: 28.04 ft, moderate flooding; 26,500 cubic feet per second May 13, 2005: 25.16 ft, minor flooding; 18,000 cubic feet per second Sep 18, 2006: 16.44 ft, below flood stage; 4,780 cubic feet per second May 8, 2007: 32.44 ft, moderate flooding; 55,300 cubic feet per second Jun 14, 2008: 29.19 ft, moderate flooding; 32,300 cubic feet per second Apr 28, 2009: 20.42 ft, below flood stage; 9,980 cubic feet per second Jun 14, 2010: 26.95 ft, minor flooding; 19,800 cubic feet per second Feb 17, 2011: 23.77 ft, action stage; 16,800 cubic feet per second Jun 27, 2011: 24.76 ft, action stage Apr 15, 2012: 23.31 ft, action stage; 14,100 cubic feet per second May 30, 2013: 23.66 ft, action stage; 16,200 cubic feet per second Jun 4, 2014: 26.57 ft, minor flooding; 23,100 cubic feet per second Dec 15, 2015: 27.27 ft, minor flooding May 11, 2016: 25.65 ft, minor flooding; 21,200 cubic feet per second May 21, 2017: 24.86 ft, action stage; 19,300 cubic feet per second Oct 10, 2018: 25.18 ft, minor flooding; 16,000 cubic feet per second Mar 16, 2019: 31.07 ft, moderate flooding; 39,000 cubic feet per second May 27, 2020: 17.94 ft, below flood stage; 8,110 cubic feet per second Oct 25, 2021: 13.21 ft, below flood stage; 3,410 cubic feet per second Jun 8, 2022: 18.09 ft, below flood stage; 8,310 cubic feet per second Feb 28, 2023: 18.72 ft, below flood stage; 8,610 cubic feet per second May 22, 2024: 24.07 ft, action stage; 16,300 cubic feet per second Highest, 33.18 ft, Jun 17, 1998 1940 1960 1980 2000 2020 Crests at or above flood stage, by decade Crests at or above flood stage per decade, Nishnabotna River above Hamburg 1930s: 0 1940s: 1 1950s: 0 1960s: 0 1970s: 5 1980s: 4 1990s: 8 8 2000s: 4 2010s: 6 2020s: 0 1930s 1940s 1950s 1960s 1970s 1980s 1990s 2000s 2010s 2020s 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. Categories use today's flood stages. Levees, dams and channel changes since a crest can make old and new stages not directly comparable. 5 crests measured on an earlier gauge datum are left out: 21.00 ft on Jun 17, 1917; 16.70 ft on Apr 12, 1922; 16.00 ft on Mar 27, 1923; 22.30 ft on Mar 13, 1929; 26.03 ft on Jun 24, 1947. 05 Other gauges in Fremont County Fremont County: every hazard · River floods across the country · Iowa
NOAA National Water Prediction Service, gauge HMBI4, 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.