Enter any address in Rock County, Wisconsin to see its FEMA flood zone
Flash flooding from heavy rainfall events is the dominant flood character in Rock County. Between 1993 and 2023, NOAA Storm Events data recorded 62 flood events and 23 flash flood events. For example, in June 2024, severe thunderstorms produced multiple reports of flash flooding across the county, including near Argyle and Janesville. Earlier, in June 2024, 4-6 inches of rain led to flash flooding in Rock and Walworth Counties.
NFIP claims data indicates that properties in Zone A and Zone X_UNSHADED have experienced the most significant flood damage. Zone A claims averaged $16,202 with an average water depth of 6.9 feet, while Zone X_UNSHADED claims averaged $12,029 with an average water depth of 9.1 feet. Homeowners in these zones, as well as those in Zone X_SHADED and Zone X, should pay close attention to flood risk.
Summary generated from NOAA storm narratives and NFIP claim data for this county. Not predictive.
41 NOAA storm reports from this county describe what happened, in the words of the meteorologists who were there.
Rock County, Wisconsin has recorded 85 flood-related events since 1996 according to NOAA's Storm Events Database, including 23 flash floods and 62 river or area floods. The county has received 15 federal disaster declarations, 2 of which involved flooding or coastal storms. Enter any address above to check its FEMA flood zone designation.
FEMA Disaster Declarations (1973–2020)
Source: OpenFEMA Disaster Declarations Summaries.
| Declaration | Type | Date |
|---|---|---|
| Covid-19 | Biological | Jan 20, 2020 |
| Covid-19 Pandemic | Biological | Jan 20, 2020 |
| Severe Storms, Tornadoes, And Flooding | Severe Storm | Jun 5, 2008 |
| Record Snow And Near Record Snow | Snowstorm | Feb 5, 2008 |
| Severe Storms And Flooding | Severe Storm | Aug 18, 2007 |
| Hurricane Katrina Evacuation | Hurricane | Aug 29, 2005 |
| Severe Storms And Flooding | Severe Storm | May 7, 2004 |
| Snow | Snowstorm | Dec 11, 2000 |
| Severe Storms And Flooding | Severe Storm | Aug 5, 1998 |
| Severe Storms, Tornadoes & Flooding | Severe Storm | Jun 7, 1993 |
NOAA Storm Events Database (1996–2025)
Source: NOAA National Weather Service Storm Events Database.
| Type | Date | Damage |
|---|---|---|
| Flood | Jun 29, 2025 | 1.00K |
| Flash Flood | Jun 18, 2025 | 5.00K |
| Flash Flood | Aug 18, 2025 | 50.00K |
| Flash Flood | Jun 22, 2024 | 20.00K |
| Flood | Jul 15, 2024 | 1.00K |
| Flood | Jul 14, 2024 | 1.00K |
| Flood | Jul 14, 2024 | 2.00K |
| Flash Flood | Jun 3, 2024 | 15.00K |
| Flood | Jun 3, 2024 | 1.00K |
| Flood | Apr 3, 2024 | 2.00K |
Flood — Jun 29, 2025
Numerous thunderstorms erupted over southern WI ahead of a slow moving cold front. Damaging downburst winds occurred in and around Timmerman Field in Milwaukee. Urban and small stream flooding occurred in Pardeeville and Janesville.
Flash Flood — Jun 18, 2025
Low pressure tracking from northern Missouri to southern Lake MI spread rounds of thunderstorms across far southern WI. This eventually led to flash flooding in Rock and Walworth Counties after 4-6 inches of rain had fallen.
Flash Flood — Aug 18, 2025
Numerous thunderstorms and heavy rain ahead of a slow moving cold front caused some flooding in southern Rock and Walworth Counties.
Flash Flood — Jun 22, 2024
Severe thunderstorms developed across western Wisconsin and moved eastward across southern Wisconsin through the afternoon and evening hours on June 22nd due to passing low pressure and its approaching cold front. There were supercell thunderstorms along with bowing segments along this line which lead to multiple areas of damage. Two strong tornadoes occurred, which were rated EF-2 near Argyl...
Flood — Jul 15, 2024
A complex of thunderstorms along a cold front moved across southern Wisconsin causing locally damaging winds, large hail and flash flooding. A tornado occurred near Evansville.
Source: NOAA National Weather Service Storm Events Database.
Source: OpenFEMA NFIP Individual Claims (2.25M records analyzed).
FEMA assigns flood zone designations to areas in Rock County, Wisconsin:
AE High Risk — 1% annual chance of flooding. Insurance required.
VE Very High Risk — Coastal flooding with wave action.
X (Shaded) Moderate Risk — 500-year floodplain.
X Low Risk — Outside major floodplains.
Properties in Rock County, Wisconsin that are in FEMA-designated Special Flood Hazard Areas (zones A and V) with federally backed mortgages are required to carry flood insurance.
Even outside high-risk zones, flood insurance is recommended. From 2014 to 2024, nearly one-third of NFIP claims came from outside the high-risk Special Flood Hazard Area.
Visit FloodSmart.gov to find an agent and get a quote.