States › South Dakota › Hamlin County › Flood
Flood in Hamlin County, South Dakota
77 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.
Hamlin County, South Dakota, has 77 flood events in the NCEI record since 1950, with at least one in 17 different years.
April is the busiest month, with 16 of the recorded events. The last 20 years account for 67 events against 10 in the 20 years before, a change that reflects reporting practice as much as weather.
The county holds 2.3% of the 3,390 flood events recorded in South Dakota; its 15.2 per 100 square miles compares with 4.5 statewide.
Compared with South Dakota
| Measure | Hamlin County | South Dakota | US |
|---|---|---|---|
| Flood events since 1950 | 77 | 3,390 | 183,559 |
| Per 100 square miles | 15.2 | 4.5 | 5.2 |
| Per 10,000 residents | 123.1 | 37.9 | 5.5 |
| Deaths recorded | 0 | 10 | 2,961 |
| Busiest month | April | June | June |
By year
Seasonality
0Feb
0Mar
15Apr
16May
10Jun
15Jul
5Aug
10Sep
4Oct
1Nov
1Dec
0
Recorded events
All 77 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 |
|---|---|---|---|---|---|---|---|
| 22 Aug 2025 | Flood | — | — | — | — | — | County |
| 17 Aug 2025 | Flood | — | — | — | — | — | County |
| 17 Aug 2025 | Flood | — | — | — | — | — | County |
| 6 Aug 2025 | Flood | — | — | — | — | — | County |
| 1 Aug 2025 | Flood | — | — | — | — | — | County |
| 27 Jul 2025 | Flood | — | — | — | — | — | County |
| 28 Jun 2025 | Flash Flood | — | — | — | — | — | County |
| 23 Jun 2024 | Flood | — | — | — | — | — | County |
| 3 Jun 2024 | Flood | — | — | — | — | — | County |
| 2 Jun 2024 | Flash Flood | — | — | — | — | — | County |
| 23 May 2024 | Flood | — | — | — | — | — | County |
| 8 May 2024 | Flood | — | — | — | — | — | County |
| 1 May 2023 | Flood | — | — | — | — | — | County |
| 10 Apr 2023 | Flood | — | — | — | — | — | County |
| 9 Apr 2023 | Flood | — | — | — | — | — | County |
| 1 Jun 2022 | Flood | — | — | — | — | — | County |
| 17 Mar 2022 | Flood | — | — | — | — | — | County |
| 2 Apr 2020 | Flood | — | — | — | — | — | County |
| 9 Mar 2020 | Flood | — | — | — | — | — | County |
| 1 Nov 2019 | Flood | — | — | — | — | — | County |
| 1 Oct 2019 | Flood | — | — | — | — | — | County |
| 13 Sep 2019 | Flood | — | — | — | — | — | County |
| 1 Sep 2019 | Flood | — | — | — | — | — | County |
| 1 Aug 2019 | Flood | — | — | — | — | — | County |
| 1 Jul 2019 | Flood | — | — | — | — | — | County |
| 1 Jun 2019 | Flood | — | — | $11M | — | — | County |
| 1 Jun 2019 | Flood | — | — | — | — | — | County |
| 1 May 2019 | Flood | — | — | — | — | — | County |
| 1 May 2019 | Flood | — | — | — | — | — | County |
| 1 May 2019 | Flood | — | — | — | — | — | County |
| 1 Apr 2019 | Flood | — | $202K | — | — | — | County |
| 1 Apr 2019 | Flood | — | — | — | — | — | County |
| 1 Apr 2019 | Flood | — | — | — | — | — | County |
| 24 Mar 2019 | Flood | — | — | — | — | — | County |
| 22 Mar 2019 | Flood | — | — | — | — | — | County |
| 1 May 2018 | Flood | — | — | — | — | — | County |
| 19 Apr 2018 | Flood | — | — | — | — | — | County |
| 28 Mar 2018 | Flood | — | — | — | — | — | County |
| 5 Jul 2015 | Flash Flood | — | — | — | — | — | County |
| 9 Aug 2014 | Flash Flood | — | — | — | — | — | County |
| 9 Aug 2014 | Flash Flood | — | — | — | — | — | County |
| 26 Jun 2014 | Flash Flood | — | — | — | — | — | County |
| 26 Jun 2014 | Flash Flood | — | — | — | — | — | County |
| 1 Jun 2014 | Flash Flood | — | — | — | — | — | County |
| 14 Mar 2014 | Flood | — | — | — | — | — | County |
| 23 Jun 2013 | Flash Flood | — | — | — | — | — | County |
| 1 Jun 2011 | Lakeshore Flood | — | — | — | — | — | Forecast zone |
| 1 May 2011 | Lakeshore Flood | — | — | — | — | — | Forecast zone |
| 2 Apr 2011 | Flood | — | — | — | — | — | County |
| 1 Apr 2011 | Flood | — | $800K | — | — | — | County |
| 1 Apr 2011 | Lakeshore Flood | — | — | — | — | — | Forecast zone |
| 21 Mar 2011 | Flood | — | — | — | — | — | County |
| 15 Mar 2011 | Lakeshore Flood | — | — | — | — | — | Forecast zone |
| 15 Mar 2011 | Flood | — | — | — | — | — | County |
| 15 Sep 2010 | Flash Flood | — | — | — | — | — | County |
| 1 Sep 2010 | Flash Flood | — | — | — | — | — | County |
| 1 Jul 2010 | Lakeshore Flood | — | — | — | — | — | Forecast zone |
| 26 Jun 2010 | Flash Flood | — | $50K | — | — | — | County |
| 1 Jun 2010 | Lakeshore Flood | — | — | — | — | — | Forecast zone |
| 1 May 2010 | Lakeshore Flood | — | — | — | — | — | Forecast zone |
| 1 Apr 2010 | Lakeshore Flood | — | — | — | — | — | Forecast zone |
| 15 Mar 2010 | Flood | — | — | — | — | — | County |
| 14 Mar 2010 | Flood | — | — | — | — | — | County |
| 22 Mar 2009 | Flash Flood | — | $50K | — | — | — | County |
| 19 Mar 2009 | Flood | — | — | — | — | — | County |
| 21 Apr 2007 | Flash Flood | — | — | — | — | — | County |
| 14 Mar 2007 | Flood | — | — | — | — | — | County |
| 20 Aug 2002 | Flash Flood | — | — | — | — | — | County |
| 20 Aug 2002 | Flash Flood | — | — | — | — | — | County |
| 13 Jun 2001 | Flash Flood | — | — | — | — | — | County |
| 7 Apr 2001 | Flood | — | $191K | — | — | — | Forecast zone |
| 24 Jul 1997 | Flash Flood | — | — | — | — | — | County |
| 1 May 1997 | Flood | — | — | — | — | — | Forecast zone |
| 5 Apr 1997 | Flood | — | — | — | — | — | Forecast zone |
| 1 Apr 1997 | Flood | — | — | — | — | — | Forecast zone |
| 1 Apr 1997 | Flood | — | — | — | — | — | Forecast zone |
| 21 Mar 1997 | Flood | — | — | — | — | — | Forecast zone |
Questions and answers
How many flood events has Hamlin County had?
77 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 Hamlin County?
22 Aug 2025 (Flood). Records reach NCEI about 120 days after the month ends.
What was the most damaging flood event recorded in Hamlin County?
The flood of 1 Jun 2019, with property damage estimated by NCEI at $0 and crop damage at $11M.
How does Hamlin County compare with South Dakota for flood?
15.2 events per 100 square miles against 4.5 statewide; the county holds 77 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 30 Sep 2026. See the methodology, the Flood hub and the county page.