Highest listed crest 19.10 ft June 10, 1918; 21,500 cubic feet per second
Flood stage 14.0 ft Major flooding from 19.0 ft
Crests at major 1 93rd of 203 gauges in Iowa
Most recent flood crest September 23, 2018 14.40 ft, minor flooding Listed crests at the Boone River near Webster City, 1918 to 2025 0 5 10 15 20 ft Flood stage 14.0 ft Major 19.0 ft Jun 10, 1918: 19.10 ft, major flooding; 21,500 cubic feet per second Jun 18, 1932: 16.00 ft, minor flooding; 15,000 cubic feet per second Jun 3, 1941: 5.40 ft, below flood stage; 1,500 cubic feet per second Jun 30, 1942: 7.52 ft, below flood stage; 3,060 cubic feet per second Mar 16, 1943: 6.71 ft, below flood stage; 2,410 cubic feet per second Jun 14, 1944: 13.70 ft, action stage; 10,200 cubic feet per second Aug 16, 1945: 11.51 ft, action stage; 7,200 cubic feet per second May 26, 1946: 10.67 ft, action stage; 6,730 cubic feet per second Jun 25, 1947: 12.75 ft, action stage; 9,340 cubic feet per second Mar 19, 1948: 8.40 ft, below flood stage; 4,160 cubic feet per second Mar 7, 1949: 8.24 ft, below flood stage; 3,980 cubic feet per second Mar 7, 1950: 9.25 ft, action stage; 5,000 cubic feet per second Jun 28, 1951: 13.37 ft, action stage; 10,400 cubic feet per second Jul 9, 1952: 8.10 ft, below flood stage; 3,830 cubic feet per second May 1, 1953: 5.72 ft, below flood stage; 1,760 cubic feet per second Jun 22, 1954: 18.55 ft, moderate flooding; 20,300 cubic feet per second Jul 6, 1955: 11.14 ft, action stage; 7,190 cubic feet per second May 30, 1956: 4.32 ft, below flood stage; 890 cubic feet per second Jun 16, 1957: 7.52 ft, below flood stage; 3,230 cubic feet per second Jul 15, 1958: 9.47 ft, action stage; 5,300 cubic feet per second May 24, 1959: 7.50 ft, below flood stage; 3,300 cubic feet per second Mar 29, 1960: 12.10 ft, action stage; 8,960 cubic feet per second Mar 28, 1961: 9.80 ft, action stage; 5,860 cubic feet per second Mar 31, 1962: 13.15 ft, action stage; 10,600 cubic feet per second Apr 29, 1963: 7.52 ft, below flood stage; 3,520 cubic feet per second Aug 1, 1964: 7.77 ft, below flood stage; 3,820 cubic feet per second Apr 6, 1965: 15.91 ft, minor flooding; 15,200 cubic feet per second Jun 15, 1966: 5.71 ft, below flood stage; 2,140 cubic feet per second Jun 10, 1967: 12.64 ft, action stage; 9,840 cubic feet per second Jul 17, 1968: 6.83 ft, below flood stage; 3,040 cubic feet per second Mar 25, 1969: 11.55 ft, action stage; 8,170 cubic feet per second May 16, 1970: 9.83 ft, action stage; 5,950 cubic feet per second Feb 22, 1971: 8.57 ft, below flood stage Mar 16, 1971: 8.48 ft, below flood stage; 4,660 cubic feet per second Aug 6, 1972: 7.70 ft, below flood stage; 3,730 cubic feet per second Mar 14, 1973: 9.68 ft, action stage; 5,270 cubic feet per second Jun 22, 1974: 8.79 ft, below flood stage; 4,860 cubic feet per second Apr 29, 1975: 9.45 ft, action stage; 5,810 cubic feet per second May 23, 1976: 5.19 ft, below flood stage; 1,730 cubic feet per second Aug 16, 1977: 5.46 ft, below flood stage; 1,760 cubic feet per second Jun 18, 1978: 7.43 ft, below flood stage; 3,490 cubic feet per second Aug 25, 1979: 11.57 ft, action stage; 8,760 cubic feet per second Jun 16, 1980: 8.14 ft, below flood stage; 4,530 cubic feet per second Jun 26, 1981: 13.71 ft, action stage; 10,300 cubic feet per second Jul 11, 1982: 9.79 ft, action stage; 6,470 cubic feet per second Jul 2, 1983: 13.98 ft, action stage; 12,500 cubic feet per second Jun 18, 1984: 13.95 ft, action stage; 11,300 cubic feet per second Sep 9, 1985: 7.57 ft, below flood stage; 3,880 cubic feet per second Mar 19, 1986: 8.91 ft, below flood stage; 5,370 cubic feet per second Oct 13, 1986: 9.62 ft, action stage; 6,370 cubic feet per second Mar 3, 1988: 4.82 ft, below flood stage May 25, 1989: 5.91 ft, below flood stage; 2,330 cubic feet per second Jun 17, 1990: 9.40 ft, action stage; 5,670 cubic feet per second Jun 5, 1991: 15.63 ft, minor flooding; 13,500 cubic feet per second Dec 13, 1991: 7.68 ft, below flood stage Mar 10, 1992: 7.67 ft, below flood stage; 4,070 cubic feet per second Apr 1, 1993: 15.32 ft, minor flooding; 13,100 cubic feet per second Mar 4, 1994: 8.26 ft, below flood stage Jun 25, 1994: 8.03 ft, below flood stage; 4,380 cubic feet per second Feb 25, 1995: 8.58 ft, below flood stage Jun 8, 1995: 7.91 ft, below flood stage; 4,300 cubic feet per second Jun 21, 1996: 6.03 ft, below flood stage; 2,560 cubic feet per second Jun 21, 1997: 10.26 ft, action stage; 6,890 cubic feet per second Jun 29, 1998: 11.41 ft, action stage; 8,270 cubic feet per second May 18, 1999: 12.10 ft, action stage; 9,070 cubic feet per second Jun 15, 2000: 8.01 ft, below flood stage; 4,340 cubic feet per second Mar 20, 2001: 11.47 ft, action stage May 5, 2001: 11.06 ft, action stage; 8,290 cubic feet per second Aug 14, 2002: 6.40 ft, below flood stage; 2,890 cubic feet per second Jul 10, 2003: 11.40 ft, action stage; 8,020 cubic feet per second May 25, 2004: 15.55 ft, minor flooding; 13,400 cubic feet per second Jun 26, 2005: 12.64 ft, action stage; 9,520 cubic feet per second Apr 3, 2006: 6.66 ft, below flood stage; 3,380 cubic feet per second Aug 23, 2007: 10.41 ft, action stage; 7,090 cubic feet per second Jun 10, 2008: 17.74 ft, moderate flooding; 20,500 cubic feet per second Feb 11, 2009: 7.08 ft, below flood stage; 3,720 cubic feet per second Jun 28, 2010: 18.17 ft, moderate flooding; 20,700 cubic feet per second Feb 18, 2011: 7.81 ft, below flood stage May 26, 2011: 7.20 ft, below flood stage; 3,850 cubic feet per second May 2, 2012: 5.58 ft, below flood stage; 2,360 cubic feet per second May 29, 2013: 13.67 ft, action stage; 12,800 cubic feet per second Jun 21, 2014: 12.05 ft, action stage; 10,100 cubic feet per second Jun 23, 2015: 7.06 ft, below flood stage; 3,560 cubic feet per second Sep 25, 2016: 14.03 ft, minor flooding; 13,400 cubic feet per second Jan 21, 2017: 7.30 ft, below flood stage May 21, 2017: 7.05 ft, below flood stage; 4,060 cubic feet per second Sep 23, 2018: 14.40 ft, minor flooding; 14,000 cubic feet per second Mar 15, 2019: 11.49 ft, action stage Oct 10, 2019: 8.91 ft, below flood stage; 6,090 cubic feet per second May 23, 2021: 4.37 ft, below flood stage; 1,260 cubic feet per second Jun 17, 2022: 6.04 ft, below flood stage; 2,740 cubic feet per second Feb 27, 2023: 8.44 ft, below flood stage May 24, 2024: 10.20 ft, action stage; 7,490 cubic feet per second Jul 21, 2025: 9.06 ft, action stage; 6,110 cubic feet per second Highest, 19.10 ft, Jun 10, 1918 1920 1940 1960 1980 2000 2020 Crests at or above flood stage, by decade Crests at or above flood stage per decade, Boone River near Webster City 1910s: 1 1920s: 0 1930s: 1 1940s: 0 1950s: 1 1960s: 1 1970s: 0 1980s: 0 1990s: 2 2000s: 2 2010s: 3 3 2020s: 0 1910s 1920s 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. Hamilton County: every hazard · River floods across the country · Iowa
NOAA National Water Prediction Service, gauge WBCI4, 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.