Aug 5, 1998
A series of thunderstorms, slowly moving northeast at 10 mph, trained through Rock Co., dumping 3 to 4 inches of rain within a couple hours. The resultant flash flood left damage to about 50 homes in Janesville, washed out gravel road shoulders, and stalled or floated many vehicles. Water levels on many roads reached a depth of 1 to 3 feet, and forced the closure of the I-94 exit ramp at Highway 14. Some homes had basement wall damage, while many streets were closed until water levels receded
Source: NOAA National Weather Service Storm Events Database (event 5664598). 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.