Mar 5, 2018
Nocturnal thunderstorms developed in a narrow band between 0100 and 0500CST across Rock and eastern Minnehaha counties. The storms produced from 1 to 2 inches of rain in a two hour period, which fell on fully frozen ground. Runoff from rainfall and snowmelt caused significant flow increases in Beaver Creek from north of Hardwick, MN to south of Brandon, SD.
Source: NOAA National Weather Service Storm Events Database (event 748019). Narrative written by NWS staff at the time of the event.
This event is one of many recorded floods in Rock County. See the full FEMA flood zone map, NFIP claim totals, and disaster history for the area.