Aug 15, 2017
Heavy rainfall fell on August 15th-16th The heaviest rains were focused over western Butler and Polk counties. A cooperative weather observer in David City measured 6.01 inches of rain for this event. This rain caused the Big Blue River and nearby tributaries to reach flood stage, which lasted until 8/23. Many roads were flooded and closed for several days in the affected area. Highway 30 was flooded near Richland and Highway 15 had water over it in both Butler and Colfax counties. Further
Source: NOAA National Weather Service Storm Events Database (event 718316). Narrative written by NWS staff at the time of the event.
This event is one of many recorded floods in Knox County. See the full FEMA flood zone map, NFIP claim totals, and disaster history for the area.