Enter any address in Grant County, Wisconsin to see its FEMA flood zone
Flash flooding from heavy rainfall events is the primary flood hazard in Grant County, WI. Over the past 30 years, NOAA Storm Events data shows 69 recorded flood events and 69 flash flood events. For example, on August 10th, 2025, two rounds of storms brought heavy rain and flash flooding, inundating residences in the town of Bagley due to a debris blockage. Later, on August 17th, 2025, heavy rainfall led to flash flooding in Lancaster.
National Flood Insurance Program (NFIP) claims data indicates that properties in Zone A and Zone X have experienced the most claims. While Zone A claims averaged a lower payout and water depth, Zone X claims, though fewer, had a higher average payout and water depth. Homeowners in areas designated as Zone A or Zone X, as well as those in areas with unknown flood risk, should pay particular attention to flood preparedness.
Summary generated from NOAA storm narratives and NFIP claim data for this county. Not predictive.
77 NOAA storm reports from this county describe what happened, in the words of the meteorologists who were there.
Grant County, Wisconsin has recorded 138 flood-related events since 1996 according to NOAA's Storm Events Database, including 69 flash floods and 69 river or area floods. The county has received 20 federal disaster declarations, 4 of which involved flooding or coastal storms. Enter any address above to check its FEMA flood zone designation.
FEMA Disaster Declarations (1965–2020)
Source: OpenFEMA Disaster Declarations Summaries.
| Declaration | Type | Date |
|---|---|---|
| Covid-19 | Biological | Jan 20, 2020 |
| Covid-19 Pandemic | Biological | Jan 20, 2020 |
| Severe Storms, Straight-line Winds, Flooding, Landslides, And Mud | Severe Storm | Jul 19, 2017 |
| Severe Storms, Flooding, And Mudslides | Severe Storm | Jun 20, 2013 |
| Severe Winter Storm And Snowstorm | Snowstorm | Jan 31, 2011 |
| Severe Storms, Tornadoes, And Flooding | Severe Storm | Jul 20, 2010 |
| Severe Storms, Tornadoes, And Flooding | Severe Storm | Jun 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 |
NOAA Storm Events Database (1996–2025)
Source: NOAA National Weather Service Storm Events Database.
| Type | Date | Damage |
|---|---|---|
| Flood | Aug 18, 2025 | 0.00K |
| Flash Flood | Aug 17, 2025 | 75.00K |
| Flash Flood | Jul 11, 2025 | 0.00K |
| Flash Flood | Jul 11, 2025 | 25.00K |
| Flash Flood | Jul 11, 2025 | 10.00K |
| Flash Flood | Jul 11, 2025 | 5.00K |
| Flash Flood | Aug 10, 2025 | 5.00K |
| Flash Flood | Aug 10, 2025 | 300.00K |
| Flash Flood | Aug 10, 2025 | 25.00K |
| Flash Flood | Jun 3, 2024 | 0.00K |
Flood — Aug 18, 2025
Heavy rainfall during the middle of August resulted in minor flooding along portions of the Trempealeau and Platte rivers in Western Wisconsin.
Flash Flood — Aug 17, 2025
Rounds of strong to severe storms throughout the day on August 16th resulted in instances of large hail, damaging winds and flash flooding in western Wisconsin. Hail with these storms reached up to golf ball sized near New Lisbon along with instances of tree damage. Later into the evening, additional storms moved through Grant County and produced heavy rainfall leading to flash flooding in Lanc...
Flash Flood — Jul 11, 2025
During the afternoon hours on July 11th, severe storms moved through Grant County bringing a few instances of severe wind gusts between 60 and 70 mph resulting in sporadic wind damage. These storms produced heavy rainfall as well which resulted in flash flooding of some county roads and some flooding of residences in Lancaster.
Flash Flood — Aug 10, 2025
Two separate rounds of storms moved through Grant County on August 10th bringing both heavy rain and flash flooding along with them. The first round of storms moved through during the early morning hours bringing widespread flooding issues to northern portions of the county. The worst of the flash flooding was in the town of Bagley where a debris blockage resulted in storm water inundating resi...
Flash Flood — Jun 3, 2024
During the late afternoon and evening hours on June 3rd, a cluster of thunderstorms produced heavy rainfall leading to mud slides and flooding on local roads and highways in Grant County.
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 Grant 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 Grant 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.