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Flood in Corson County, South Dakota
55 floods and flash floods events in the NCEI Storm Events record, 1950 to 2026. Event types counted: Flood, Flash Flood, Coastal Flood, Lakeshore Flood.
NCEI notes that Storm Data is compiled from a variety of sources including the National Weather Service, other federal, state and local agencies, the media and the public; that property and crop damage figures are estimates; and that some events are recorded by NWS forecast zone rather than by county. FEMA notes that NFIP claim records are redacted and aggregated to protect the privacy of policyholders. Storm records through 30 Jun 2026.
NCEI records 55 flood events in Corson County, South Dakota, between 1950 and 2026, spread over 20 years.
March is the busiest month, with 15 of the recorded events. The last 20 years account for 45 events against 10 in the 20 years before, a change that reflects reporting practice as much as weather.
The county holds 1.6% of the 3,390 flood events recorded in South Dakota; its 2.2 per 100 square miles compares with 4.5 statewide.
Compared with South Dakota
| Measure | Corson County | South Dakota | US |
|---|---|---|---|
| Flood events since 1950 | 55 | 3,390 | 183,559 |
| Per 100 square miles | 2.2 | 4.5 | 5.2 |
| Per 10,000 residents | 142.0 | 37.9 | 5.5 |
| Deaths recorded | 0 | 10 | 2,961 |
| Busiest month | March | June | June |
By year
Seasonality
0Feb
1Mar
15Apr
8May
7Jun
12Jul
6Aug
4Sep
1Oct
1Nov
0Dec
0
Recorded events
All 55 events, most recent first. Magnitude is hail size, tornado rating or wind speed as recorded.
| Date | Event type | Magnitude | Property damage | Crop damage | Deaths | Injuries | Geography |
|---|---|---|---|---|---|---|---|
| 20 May 2025 | Flood | — | — | — | — | — | County |
| 20 May 2025 | Flood | — | — | — | — | — | County |
| 16 May 2025 | Flood | — | — | — | — | — | County |
| 25 Jun 2023 | Flood | — | — | — | — | — | County |
| 11 Apr 2023 | Flood | — | — | — | — | — | County |
| 12 May 2022 | Flood | — | — | — | — | — | County |
| 10 Jun 2021 | Flood | — | — | — | — | — | County |
| 8 Jun 2021 | Flash Flood | — | — | — | — | — | County |
| 7 Mar 2020 | Flood | — | — | — | — | — | County |
| 21 Oct 2019 | Flood | — | — | — | — | — | County |
| 13 Sep 2019 | Flood | — | — | — | — | — | County |
| 9 Jul 2019 | Flood | — | — | — | — | — | County |
| 1 Jun 2019 | Flood | — | — | $1.5M | — | — | County |
| 1 May 2019 | Flood | — | — | — | — | — | County |
| 1 Apr 2019 | Flood | — | — | — | — | — | County |
| 1 Apr 2019 | Flood | — | — | — | — | — | County |
| 27 Mar 2019 | Flood | — | — | — | — | — | County |
| 23 Mar 2019 | Flood | — | — | — | — | — | County |
| 23 Mar 2019 | Flood | — | — | — | — | — | County |
| 22 Jul 2018 | Flash Flood | — | — | — | — | — | County |
| 4 Jul 2018 | Flash Flood | — | — | — | — | — | County |
| 16 May 2015 | Flash Flood | — | — | — | — | — | County |
| 24 Aug 2014 | Flood | — | — | — | — | — | County |
| 19 Jun 2014 | Flood | — | — | — | — | — | County |
| 18 Jun 2014 | Flash Flood | — | — | — | — | — | County |
| 18 Jun 2014 | Flash Flood | — | — | — | — | — | County |
| 11 Mar 2014 | Flood | — | — | — | — | — | County |
| 10 Mar 2014 | Flood | — | — | — | — | — | County |
| 31 May 2013 | Flood | — | — | — | — | — | County |
| 7 Jun 2012 | Flash Flood | — | — | — | — | — | County |
| 20 Jun 2011 | Flood | — | — | — | — | — | County |
| 2 Apr 2011 | Flood | — | — | — | — | — | County |
| 19 Mar 2011 | Flood | — | — | — | — | — | County |
| 17 Mar 2011 | Flood | — | — | — | — | — | County |
| 1 Apr 2010 | Flood | — | — | — | — | — | County |
| 30 Mar 2010 | Flood | — | — | — | — | — | County |
| 23 Mar 2010 | Flood | — | — | — | — | — | County |
| 12 Apr 2009 | Flood | — | — | — | — | — | County |
| 10 Apr 2009 | Flood | — | — | — | — | — | County |
| 20 Mar 2009 | Flood | — | $50K | — | — | — | County |
| 20 Mar 2009 | Flood | — | — | — | — | — | County |
| 9 Feb 2009 | Flood | — | — | — | — | — | County |
| 18 Aug 2007 | Flood | — | — | — | — | — | County |
| 17 Aug 2007 | Flash Flood | — | — | — | — | — | County |
| 12 Jun 2007 | Flash Flood | — | — | — | — | — | County |
| 7 Jun 2005 | Flash Flood | — | — | — | — | — | County |
| 16 Jul 2001 | Flash Flood | — | — | — | — | — | County |
| 6 Jun 1999 | Flash Flood | — | — | — | — | — | County |
| 26 Aug 1998 | Flood | — | — | — | — | — | Forecast zone |
| 10 Jul 1998 | Flash Flood | — | — | — | — | — | County |
| 11 Jul 1997 | Flash Flood | — | — | — | — | — | County |
| 1 Apr 1997 | Flood | — | — | — | — | — | Forecast zone |
| 26 Mar 1997 | Flood | — | — | — | — | — | Forecast zone |
| 23 Mar 1997 | Flood | — | — | — | — | — | Forecast zone |
| 21 Mar 1997 | Flood | — | — | — | — | — | Forecast zone |
Questions and answers
How many flood events has Corson County had?
55 events in the NCEI Storm Events record between 1950 and 2026. Reporting of floods and flash floods became far more complete after 1996, so early decades undercount.
When was the last recorded flood event in Corson County?
20 May 2025 (Flood). Records reach NCEI about 120 days after the month ends.
What was the most damaging flood event recorded in Corson County?
The flood of 1 Jun 2019, with property damage estimated by NCEI at $0 and crop damage at $1.5M.
How does Corson County compare with South Dakota for flood?
2.2 events per 100 square miles against 4.5 statewide; the county holds 55 of the state's 3,390 recorded events.
Provenance
NOAA NCEI Storm Events Database, yearly details files through 30 Jun 2026, public domain. County-recorded events plus zone-recorded events whose forecast zone is named for the county (marked "Forecast zone"). Population and area from the US Census Bureau (2021). Built 1 Oct 2026. See the methodology, the Flood hub and the county page.