Event narrative (NOAA)
Rainfall amounts across Union County from June 20-22 ranged from around a third of an inch across southern areas to 1 to 2 inches across northern areas. Farther north and upstream, 6 to 10 inches of rain fell across portions of southeast South Dakota and northwest Iowa, with locally higher amounts in excess of 12 inches. ||This rainfall resulted in record flooding along the Big Sioux River and extensive overland flooding along the adjoining flood plain. County-wide, 44 residences were destroyed and another 182 received minor to major flood damage. Estimated losses exceed 52 million dollars. At the peak of the flooding, there were an estimated 20 to 30 water rescues. ||Residents along Northshore and Penrose Drives on the north side of McCook Lake were evacuated on the evening of June 23 as
Other notable flood events in South Dakota
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.