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Flood in Brown County, South Dakota
192 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 192 flood events in Brown County, South Dakota, between 1950 and 2026, spread over 25 years.
April is the busiest month, with 35 of the recorded events. The last 20 years account for 156 events against 36 in the 20 years before, a change that reflects reporting practice as much as weather.
The county holds 5.7% of the 3,390 flood events recorded in South Dakota; its 11.2 per 100 square miles compares with 4.5 statewide.
Compared with South Dakota
| Measure | Brown County | South Dakota | US |
|---|---|---|---|
| Flood events since 1950 | 192 | 3,390 | 183,559 |
| Per 100 square miles | 11.2 | 4.5 | 5.2 |
| Per 10,000 residents | 50.4 | 37.9 | 5.5 |
| Deaths recorded | 0 | 10 | 2,961 |
| Busiest month | April | June | June |
By year
Seasonality
2Feb
3Mar
21Apr
35May
27Jun
28Jul
28Aug
24Sep
12Oct
5Nov
3Dec
4
Recorded events
All 192 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 |
|---|---|---|---|---|---|---|---|
| 1 Oct 2025 | Flood | — | — | — | — | — | County |
| 1 Sep 2025 | Flood | — | — | — | — | — | County |
| 1 Sep 2025 | Flood | — | — | — | — | — | County |
| 26 Aug 2025 | Flood | — | — | — | — | — | County |
| 17 Aug 2025 | Flood | — | — | — | — | — | County |
| 10 Aug 2025 | Flood | — | — | — | — | — | County |
| 15 Jul 2025 | Flood | — | — | — | — | — | County |
| 4 Jul 2025 | Flash Flood | — | — | — | — | — | County |
| 1 Sep 2023 | Flood | — | — | — | — | — | County |
| 1 Aug 2023 | Flood | — | — | — | — | — | County |
| 1 Aug 2023 | Flood | — | — | — | — | — | County |
| 1 Jul 2023 | Flood | — | — | — | — | — | County |
| 1 Jul 2023 | Flood | — | — | — | — | — | County |
| 1 Jun 2023 | Flood | — | — | — | — | — | County |
| 1 Jun 2023 | Flood | — | — | — | — | — | County |
| 1 May 2023 | Flood | — | — | — | — | — | County |
| 1 May 2023 | Flood | — | — | — | — | — | County |
| 18 Apr 2023 | Flood | — | — | — | — | — | County |
| 17 Apr 2023 | Flood | — | — | — | — | — | County |
| 17 Apr 2023 | Flood | — | — | — | — | — | County |
| 16 Apr 2023 | Flood | — | — | — | — | — | County |
| 15 Apr 2023 | Flood | — | — | — | — | — | County |
| 15 Apr 2023 | Flood | — | — | — | — | — | County |
| 13 Apr 2023 | Flood | — | — | — | — | — | County |
| 10 Apr 2023 | Flood | — | $150K | $150K | — | — | County |
| 1 Sep 2022 | Flood | — | — | — | — | — | County |
| 1 Sep 2022 | Flood | — | — | — | — | — | County |
| 1 Aug 2022 | Flood | — | — | — | — | — | County |
| 1 Aug 2022 | Flood | — | — | — | — | — | County |
| 1 Jul 2022 | Flood | — | — | — | — | — | County |
| 1 Jul 2022 | Flood | — | — | — | — | — | County |
| 1 Jun 2022 | Flood | — | — | — | — | — | County |
| 1 Jun 2022 | Flood | — | — | — | — | — | County |
| 7 May 2022 | Flood | — | — | — | — | — | County |
| 2 May 2022 | Flood | — | — | — | — | — | County |
| 1 May 2022 | Flood | — | — | $49K | — | — | County |
| 1 May 2022 | Flood | — | — | — | — | — | County |
| 30 Apr 2022 | Flood | — | — | — | — | — | County |
| 28 Apr 2022 | Flood | — | — | — | — | — | County |
| 28 Apr 2022 | Flood | — | — | — | — | — | County |
| 1 Sep 2020 | Flood | — | — | — | — | — | County |
| 1 Aug 2020 | Flood | — | — | — | — | — | County |
| 25 Jul 2020 | Flash Flood | — | — | — | — | — | County |
| 24 Jul 2020 | Flood | — | — | — | — | — | County |
| 24 Jul 2020 | Flood | — | — | — | — | — | County |
| 1 Jul 2020 | Flood | — | — | — | — | — | County |
| 1 Jun 2020 | Flood | — | — | — | — | — | County |
| 1 May 2020 | Flood | — | — | — | — | — | County |
| 1 Apr 2020 | Flood | — | — | — | — | — | County |
| 1 Mar 2020 | Flood | — | — | — | — | — | County |
| 1 Feb 2020 | Flood | — | — | — | — | — | County |
| 1 Jan 2020 | Flood | — | — | — | — | — | County |
| 1 Dec 2019 | Flood | — | — | — | — | — | County |
| 1 Nov 2019 | Flood | — | — | — | — | — | County |
| 1 Oct 2019 | Flood | — | — | — | — | — | County |
| 1 Sep 2019 | Flood | — | — | — | — | — | County |
| 1 Aug 2019 | Flood | — | — | — | — | — | County |
| 1 Jul 2019 | Flood | — | — | — | — | — | County |
| 21 Jun 2019 | Flood | — | — | — | — | — | County |
| 1 Jun 2019 | Flood | — | — | $36M | — | — | County |
| 1 Jun 2019 | Flood | — | — | — | — | — | County |
| 1 May 2019 | Flood | — | — | — | — | — | County |
| 1 May 2019 | Flood | — | — | — | — | — | County |
| 3 Apr 2019 | Flood | — | — | — | — | — | County |
| 2 Apr 2019 | Flood | — | — | — | — | — | County |
| 2 Apr 2019 | Flood | — | — | — | — | — | County |
| 1 Apr 2019 | Flood | — | $745K | — | — | — | County |
| 1 Apr 2019 | Flood | — | — | — | — | — | County |
| 1 Apr 2019 | Flood | — | — | — | — | — | County |
| 1 Apr 2019 | Flood | — | — | — | — | — | County |
| 30 Mar 2019 | Flood | — | — | — | — | — | County |
| 27 Mar 2019 | Flood | — | — | — | — | — | County |
| 1 May 2018 | Flood | — | — | — | — | — | County |
| 21 Apr 2018 | Flood | — | — | — | — | — | County |
| 1 Mar 2017 | Flood | — | — | — | — | — | County |
| 21 Feb 2017 | Flood | — | — | — | — | — | County |
| 21 Feb 2017 | Flood | — | — | — | — | — | County |
| 25 Dec 2016 | Flash Flood | — | — | — | — | — | County |
| 12 Aug 2016 | Flood | — | — | — | — | — | County |
| 6 Aug 2015 | Flash Flood | — | — | — | — | — | County |
| 6 Aug 2015 | Flood | — | — | — | — | — | County |
| 1 Jul 2015 | Flood | — | — | — | — | — | County |
| 1 Jun 2015 | Flood | — | — | — | — | — | County |
| 18 May 2015 | Flood | — | — | — | — | — | County |
| 31 Aug 2014 | Flood | — | — | — | — | — | County |
| 23 Aug 2014 | Flash Flood | — | — | — | — | — | County |
| 1 Jul 2014 | Flood | — | — | — | — | — | County |
| 22 Jun 2014 | Flood | — | — | — | — | — | County |
| 4 May 2014 | Flood | — | — | — | — | — | County |
| 1 Sep 2013 | Flood | — | — | — | — | — | County |
| 1 Aug 2013 | Flood | — | — | — | — | — | County |
| 1 Jul 2013 | Flood | — | — | — | — | — | County |
| 1 Jun 2013 | Flood | — | — | — | — | — | County |
| 30 May 2013 | Flood | — | — | — | — | — | County |
| 1 Jan 2012 | Flood | — | — | — | — | — | County |
| 1 Dec 2011 | Flood | — | — | — | — | — | County |
| 1 Nov 2011 | Flood | — | — | — | — | — | County |
| 1 Oct 2011 | Flood | — | — | — | — | — | County |
| 1 Sep 2011 | Flood | — | — | — | — | — | County |
| 1 Aug 2011 | Flood | — | — | — | — | — | County |
| 10 Jul 2011 | Flash Flood | — | — | — | — | — | County |
| 5 Jul 2011 | Flash Flood | — | — | — | — | — | County |
| 1 Jul 2011 | Flood | — | — | — | — | — | County |
| 1 Jul 2011 | Flood | — | — | — | — | — | County |
| 22 Jun 2011 | Flood | — | — | — | — | — | County |
| 20 Jun 2011 | Flood | — | — | — | — | — | County |
| 1 Jun 2011 | Flood | — | — | — | — | — | County |
| 1 Jun 2011 | Flood | — | — | — | — | — | County |
| 1 May 2011 | Flood | — | — | — | — | — | County |
| 1 May 2011 | Flood | — | — | — | — | — | County |
| 3 Apr 2011 | Flood | — | — | — | — | — | County |
| 1 Apr 2011 | Flood | — | — | — | — | — | County |
| 1 Apr 2011 | Flood | — | — | — | — | — | County |
| 22 Mar 2011 | Flood | — | — | — | — | — | County |
| 22 Mar 2011 | Flood | — | — | — | — | — | County |
| 15 Mar 2011 | Flood | — | — | — | — | — | County |
| 1 Aug 2010 | Flood | — | — | — | — | — | County |
| 1 Jul 2010 | Flood | — | — | — | — | — | County |
| 1 Jul 2010 | Flood | — | — | — | — | — | County |
| 1 Jun 2010 | Flood | — | — | — | — | — | County |
| 1 Jun 2010 | Flood | — | — | — | — | — | County |
| 1 May 2010 | Flood | — | — | — | — | — | County |
| 1 May 2010 | Flood | — | — | — | — | — | County |
| 1 Apr 2010 | Flood | — | — | — | — | — | County |
| 1 Apr 2010 | Flood | — | — | — | — | — | County |
| 18 Mar 2010 | Flood | — | — | — | — | — | County |
| 15 Mar 2010 | Flood | — | — | — | — | — | County |
| 15 Mar 2010 | Flood | — | — | — | — | — | County |
| 14 Mar 2010 | Flood | — | — | — | — | — | County |
| 1 Dec 2009 | Flood | — | — | — | — | — | County |
| 1 Nov 2009 | Flood | — | — | — | — | — | County |
| 1 Oct 2009 | Flood | — | — | — | — | — | County |
| 1 Sep 2009 | Flood | — | — | — | — | — | County |
| 18 Aug 2009 | Flash Flood | — | $15K | — | — | — | County |
| 14 Aug 2009 | Flash Flood | — | $15K | — | — | — | County |
| 1 Aug 2009 | Flood | — | — | — | — | — | County |
| 14 Jul 2009 | Flash Flood | — | — | — | — | — | County |
| 1 Jul 2009 | Flood | — | — | — | — | — | County |
| 16 Jun 2009 | Flash Flood | — | $100K | — | — | — | County |
| 16 Jun 2009 | Flash Flood | — | $25K | — | — | — | County |
| 1 Jun 2009 | Flood | — | — | — | — | — | County |
| 1 May 2009 | Flood | — | — | — | — | — | County |
| 13 Apr 2009 | Flood | — | — | — | — | — | County |
| 1 Apr 2009 | Flood | — | $75K | — | — | — | County |
| 25 Mar 2009 | Flash Flood | — | — | — | — | — | County |
| 23 Mar 2009 | Flood | — | $75K | — | — | — | County |
| 21 Mar 2009 | Flood | — | — | — | — | — | County |
| 20 Mar 2009 | Flood | — | $200K | — | — | — | County |
| 14 Aug 2008 | Flash Flood | — | — | — | — | — | County |
| 11 Aug 2008 | Flash Flood | — | — | — | — | — | County |
| 1 Jul 2007 | Flood | — | — | — | — | — | County |
| 1 Jun 2007 | Flood | — | — | — | — | — | County |
| 6 May 2007 | Flood | — | — | — | — | — | County |
| 5 May 2007 | Flash Flood | — | $5.0M | — | — | — | County |
| 1 May 2007 | Flood | — | — | — | — | — | County |
| 20 Apr 2007 | Flood | — | — | — | — | — | County |
| 1 Aug 2005 | Flood | — | — | — | — | — | Forecast zone |
| 1 Jul 2005 | Flood | — | — | — | — | — | Forecast zone |
| 1 Jul 2005 | Flood | — | $88K | $6.3M | — | — | Forecast zone |
| 1 Jul 2005 | Flood | — | — | — | — | — | Forecast zone |
| 29 Jun 2005 | Flood | — | — | — | — | — | Forecast zone |
| 29 Jun 2005 | Flash Flood | — | — | — | — | — | County |
| 23 Jun 2005 | Flood | — | — | — | — | — | Forecast zone |
| 11 Jun 2005 | Flood | — | — | — | — | — | Forecast zone |
| 10 Jun 2005 | Flood | — | — | — | — | — | Forecast zone |
| 29 May 2004 | Flash Flood | — | — | — | — | — | County |
| 22 Aug 2002 | Flash Flood | — | — | — | — | — | County |
| 1 Jun 2001 | Flood | — | — | — | — | — | Forecast zone |
| 1 May 2001 | Flood | — | — | — | — | — | Forecast zone |
| 1 Apr 2001 | Flood | — | — | — | — | — | Forecast zone |
| 28 Mar 2001 | Flood | — | — | — | — | — | Forecast zone |
| 26 Oct 2000 | Flash Flood | — | — | — | — | — | County |
| 1 Jul 2000 | Flash Flood | — | — | — | — | — | County |
| 3 Sep 1999 | Flood | — | — | — | — | — | Forecast zone |
| 3 Sep 1999 | Flash Flood | — | $5K | — | — | — | County |
| 1 May 1999 | Flood | — | — | — | — | — | Forecast zone |
| 3 Apr 1999 | Flood | — | — | — | — | — | Forecast zone |
| 26 Jun 1998 | Flood | — | — | — | — | — | Forecast zone |
| 11 May 1998 | Flood | — | $460K | — | — | — | Forecast zone |
| 1 May 1998 | Flood | — | — | — | — | — | Forecast zone |
| 2 Apr 1998 | Flood | — | — | — | — | — | Forecast zone |
| 1 Jul 1997 | Flood | — | — | — | — | — | Forecast zone |
| 1 May 1997 | Flood | — | — | — | — | — | Forecast zone |
| 1 Apr 1997 | Flood | — | — | — | — | — | Forecast zone |
| 1 Apr 1997 | Flood | — | — | — | — | — | Forecast zone |
| 1 Apr 1997 | Flood | — | — | — | — | — | Forecast zone |
| 1 Apr 1997 | Flood | — | — | — | — | — | Forecast zone |
| 30 Mar 1997 | Flood | — | — | — | — | — | Forecast zone |
| 29 Mar 1997 | Flood | — | — | — | — | — | Forecast zone |
| 27 Mar 1997 | Flood | — | — | — | — | — | Forecast zone |
| 25 Mar 1997 | Flood | — | — | — | — | — | Forecast zone |
| 21 Mar 1997 | Flood | — | — | — | — | — | Forecast zone |
Questions and answers
How many flood events has Brown County had?
192 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 Brown County?
1 Oct 2025 (Flood). Records reach NCEI about 120 days after the month ends.
What was the most damaging flood event recorded in Brown County?
The flood of 1 Jun 2019, with property damage estimated by NCEI at $0 and crop damage at $36M.
How does Brown County compare with South Dakota for flood?
11.2 events per 100 square miles against 4.5 statewide; the county holds 192 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.