Summer Floods in the Minnesota River Valley

1916 Mankato Flood

The vast amount of snow which fell in the upper Midwest during the winter of 2010-1011 created a lot of nervousness among residents of the river valleys when the spring melt occurred. Perhaps th eMankato area was more fortunate than many communities in the lower Mississippi River system.

But summer floods can be nearly as devastating.  Given the natural peculiarities of the terrain in theMankatoarea, a heavy rain can become a disaster.  Two large rivers meet here and form a bowl-shaped configuration of drainage.  Ravines radiate outward and collect run-off into narrow channels.  Creeks become rivers in a hurry.

Summer freshets have brought grief to Mankato area residents and store owners in July 1916; August 1948; August 7, 1968; June 1993 and September 2010 and possibly at other times.

On August 7, 1968, a 7.1-inch downpour inundated Mankato. From North Front to well into the South Front, downtown resembled the canals of Venice. In fact, in order to assist in the copious amounts of basement fires that resulted from the flood, the fire department was forced to use small boats for transportation. In front of the Hubbard House, automobiles floated along with debris to pile up on lawns.  The Hubbard Carriage House suffered extensive damage to its artifacts.  Several parking lots became new lakes. An unnamed waterfall developed at the Mankato State College Valley Campus track.  Marti’s Pizza developed a new subterranean cavern. What made matters worse though was when a landslide of mud slid down the hills of Mankato uprooting tress, clogging sewers and causing millions of dollars worth of damage. Mud was so thick and slippery (one intersection was clogged by up to two feet of mud) that driving became hazardous and snow plows were called out to clear Front Street and six bridges were washed away.

The floods not only deeply affected the Mankato urban area but devastated the rural areas of Blue Earth as well. Country farmers suffered almost $2 million in setbacks and production was severely hampered for that season. Then Governor Harold Levander called a state of emergency for Southern Minnesota’s water-soaked counties.

Between the devastation in Mankato and the surrounding area, an estimated total of $7 million price tag came with nature’s surprise. 

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