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Flood in Brown County, Wisconsin
37 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.
Brown County, Wisconsin, has 37 flood events in the NCEI record since 1950, with at least one in 16 different years.
July is the busiest month, with 8 of the recorded events. The last 20 years account for 28 events against 9 in the 20 years before, a change that reflects reporting practice as much as weather.
The county holds 1.4% of the 2,580 flood events recorded in Wisconsin; its 7.0 per 100 square miles compares with 4.8 statewide.
Compared with Wisconsin
| Measure | Brown County | Wisconsin | US |
|---|---|---|---|
| Flood events since 1950 | 37 | 2,580 | 183,559 |
| Per 100 square miles | 7.0 | 4.8 | 5.2 |
| Per 10,000 residents | 1.4 | 4.4 | 5.5 |
| Deaths recorded | 0 | 30 | 2,961 |
| Busiest month | July | June | June |
By year
Seasonality
0Feb
0Mar
4Apr
5May
4Jun
2Jul
8Aug
4Sep
5Oct
3Nov
1Dec
1
Recorded events
All 37 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 |
|---|---|---|---|---|---|---|---|
| 24 Jun 2026 | Flash Flood | — | — | — | — | — | County |
| 14 Apr 2026 | Flash Flood | — | — | — | — | — | County |
| 13 Apr 2026 | Flash Flood | — | — | — | — | — | County |
| 5 Jul 2025 | Flash Flood | — | — | — | — | — | County |
| 5 Jul 2024 | Flash Flood | — | — | — | — | — | County |
| 10 Aug 2021 | Flash Flood | — | — | — | — | — | County |
| 28 May 2020 | Flood | — | — | — | — | — | County |
| 18 May 2020 | Flood | — | — | — | — | — | County |
| 17 May 2020 | Lakeshore Flood | — | — | — | — | — | Forecast zone |
| 29 Apr 2020 | Flood | — | — | — | — | — | County |
| 28 Apr 2020 | Lakeshore Flood | — | $450K | — | — | — | Forecast zone |
| 1 Dec 2019 | Lakeshore Flood | — | — | — | — | — | Forecast zone |
| 27 Nov 2019 | Lakeshore Flood | — | — | — | — | — | Forecast zone |
| 21 Oct 2019 | Lakeshore Flood | — | — | — | — | — | Forecast zone |
| 2 Oct 2019 | Lakeshore Flood | — | — | — | — | — | Forecast zone |
| 1 Oct 2019 | Lakeshore Flood | — | — | — | — | — | Forecast zone |
| 11 Sep 2019 | Flash Flood | — | $50K | — | — | — | County |
| 7 Aug 2019 | Flood | — | $1K | — | — | — | County |
| 20 Jul 2019 | Flash Flood | — | $1K | — | — | — | County |
| 18 May 2019 | Lakeshore Flood | — | $5K | — | — | — | Forecast zone |
| 15 Mar 2019 | Flood | — | $1.1M | — | — | — | County |
| 17 Sep 2018 | Flash Flood | — | $500K | — | — | — | County |
| 28 Aug 2018 | Flood | — | $5K | — | — | — | County |
| 22 Jul 2017 | Flood | — | $500 | — | — | — | County |
| 8 Sep 2015 | Flash Flood | — | — | — | — | — | County |
| 23 Sep 2010 | Flash Flood | — | — | — | — | — | County |
| 20 Aug 2010 | Flash Flood | — | $8K | — | — | — | County |
| 15 Jul 2010 | Flood | — | $10K | — | — | — | County |
| 28 Mar 2005 | Flood | — | — | — | — | — | Forecast zone |
| 5 Mar 2004 | Flood | — | — | — | — | — | Forecast zone |
| 30 Jul 2003 | Flash Flood | — | — | — | — | — | County |
| 30 Jul 2003 | Flash Flood | — | — | — | — | — | County |
| 8 Jul 2000 | Flood | — | — | — | — | — | County |
| 26 Sep 1998 | Flash Flood | — | $5K | — | — | — | County |
| 1 Apr 1998 | Flood | — | — | — | — | — | Forecast zone |
| 31 Mar 1998 | Flood | — | — | — | — | — | Forecast zone |
| 16 Jun 1996 | Flood | — | — | — | — | — | Forecast zone |
Questions and answers
How many flood events has Brown County had?
37 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?
24 Jun 2026 (Flash 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 15 Mar 2019, with property damage estimated by NCEI at $1.1M.
How does Brown County compare with Wisconsin for flood?
7.0 events per 100 square miles against 4.8 statewide; the county holds 37 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.