What was the first flood in the United States to cost $1 billion in damages?

The flooding of the Kansas River at Kansas City, Missouri and topeka and Lawrence, Kansas, in July 1951. Fourty-one people were killed.

Correct, koicarp.

May, June and July 1951 saw record rainfall over most of Kansas and Missouri, which led to record flooding on the Kansas, Osage, Neosho, Verdigris and Missouri Rivers. By the end of July 1951, more than 150 communities in the two states had been devastated, including both state capitals and Kansas City on both sides of the state line. The record floods took 28 lives and caused nearly $1 billion damage (in 1951 dollars). - NationalOceanicandAtmosphericAdministration.gov

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