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Flood in Dunn County, Wisconsin
17 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 17 flood events in Dunn County, Wisconsin, between 1950 and 2026, spread over 14 years.
June is the busiest month, with 4 of the recorded events. The last 20 years account for 10 events against 7 in the 20 years before, a change that reflects reporting practice as much as weather.
The county holds 0.7% of the 2,580 flood events recorded in Wisconsin; its 2.0 per 100 square miles compares with 4.8 statewide.
Compared with Wisconsin
| Measure | Dunn County | Wisconsin | US |
|---|---|---|---|
| Flood events since 1950 | 17 | 2,580 | 183,559 |
| Per 100 square miles | 2.0 | 4.8 | 5.2 |
| Per 10,000 residents | 3.7 | 4.4 | 5.5 |
| Deaths recorded | 0 | 30 | 2,961 |
| Busiest month | June | June | June |
By year
Seasonality
0Feb
0Mar
1Apr
1May
2Jun
4Jul
3Aug
4Sep
2Oct
0Nov
0Dec
0
Recorded events
All 17 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 |
|---|---|---|---|---|---|---|---|
| 29 Jun 2020 | Flash Flood | — | — | — | — | — | County |
| 15 Mar 2019 | Flood | — | — | — | — | — | County |
| 31 May 2016 | Flash Flood | — | — | — | — | — | County |
| 2 Sep 2015 | Flash Flood | — | — | — | — | — | County |
| 6 Jul 2015 | Flash Flood | — | — | — | — | — | County |
| 6 Jul 2015 | Flash Flood | — | — | — | — | — | County |
| 21 Jun 2013 | Flash Flood | — | — | — | — | — | County |
| 11 Aug 2010 | Flash Flood | — | — | — | — | — | County |
| 14 Aug 2009 | Flash Flood | — | $250K | — | — | — | County |
| 8 Aug 2009 | Flash Flood | — | — | — | — | — | County |
| 7 Jun 2005 | Flash Flood | — | $5K | — | — | — | County |
| 4 Jul 2004 | Flash Flood | — | — | — | — | — | County |
| 11 May 2003 | Flash Flood | — | — | — | — | — | County |
| 25 Jun 2002 | Flash Flood | — | — | — | — | — | County |
| 1 Aug 2001 | Flash Flood | — | $50K | — | — | — | County |
| 10 Sep 2000 | Flash Flood | — | — | — | — | — | County |
| 3 Apr 1997 | Flood | — | — | — | — | — | Forecast zone |
Questions and answers
How many flood events has Dunn County had?
17 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 Dunn County?
29 Jun 2020 (Flash Flood). Records reach NCEI about 120 days after the month ends.
What was the most damaging flood event recorded in Dunn County?
The flash flood of 14 Aug 2009, with property damage estimated by NCEI at $250K.
How does Dunn County compare with Wisconsin for flood?
2.0 events per 100 square miles against 4.8 statewide; the county holds 17 of the state's 2,580 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.