May 20, 2025
More seasonal rainfall was observed in middle to late May across north central South Dakota. A local area of moderate to heavy rain, between 4 to 6 inches, was observed with a system on May 15th and 16th, with the COOP observer located 8 miles south southwest of Keldron recording 5.6 inches of moisture. This would result in minor flooding of the Grand River, with the gauge near Little Eagle topping out at 15.43 feet, which is 0.43 feet above flood stage. Minor flooding of pastureland was the onl
Source: NOAA National Weather Service Storm Events Database (event 1261378). Narrative written by NWS staff at the time of the event.
This event is one of many recorded floods in Corson County. See the full FEMA flood zone map, NFIP claim totals, and disaster history for the area.