This is a continuation of the book Sixteen Year Study on Minnesota Flash Floods. This document was published in January, 1988 by the Minnesota Department of Natural Resources Division of Waters State Climatology Office and the University of Minnesota Soil Science Department. That study looked at sixteen years of flash floods from 1970 to 1985. In addition, flash floods from 1986 to 2006 are included below.
    The definition of a flash flood used here is the occurrence of 6 inches or more rainfall within a 24 hour period. The size of a flash flood is measured area in square miles over which a 4-inch or more rainfall occurs. The rationale for using this criteria is that a rainfall of six inches in a 24-hour period is near the 100-year return period in Minnesota and, second, a 4-inch and greater rainfall approximates the level at which the newspsper reports indicate increased erosion or other economic damages are associated. There are a total of 114 flash flood events documented here since 1970.

Flash Flood Events Year by Year

1970	1971	1972	1973	1974
1975	1976	1977	1978	1979
1980	1981	1982	1983	1984
1985	1986	1987	1988	1989
1990	1991	1992	1993	1994
1995	1996	1997	1998	1999
2000	2001	2002	2003	2004
2005	2006

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URL: http://climate.umn.edu/doc/flashflood.htm
Last modified: September 6, 2006