Event narrative (NOAA)
Rainfall amounts across Sioux County from June 20-22 ranged from 2 to 7 inches, with the highest amounts across the northern half of the county. Farther north and upstream, up to 12 inches of rain fell across portions of southeast South Dakota and northwest Iowa. This rainfall resulted in extensive overland flooding and major to record flooding along the Big Sioux, Rock, West Branch Floyd, and Floyd Rivers, and Burr Oak Creek. ||Large sections of Rock Valley and Hawarden were evacuated as flood waters inundated both cities. An estimated 200 people were rescued during the peak of the flooding. An estimated 60 businesses were impacted by flood water in Rock Valley and Hawarden. County-wide, 700 to 800 housing units were impacted by flood water, 150 of which were declared a total loss. Rock V
Other notable flood events in Iowa
Source: NOAA/NCEI Storm Events Database. Deaths and injuries are those NOAA classifies as direct. Damage is the reporting office's estimate at the time and is not inflation-adjusted. This is a catalogue record, not a forecast.