Enter any address in Trempealeau County, Wisconsin to see its FEMA flood zone
River overflow along the Mississippi and Trempealeau rivers is the dominant flood character for Trempealeau County. Between 1996 and 2024, NOAA Storm Events data recorded 81 flood events and 21 flash flood events in the county. Recent examples include widespread river flooding in June and July 2024, following heavy rainfall that pushed the Mississippi River and other river basins into flood stage. Minor flooding along the Trempealeau and Platte rivers also occurred in August 2025 due to heavy rainfall.
FEMA data indicates that properties in Zone A have experienced the most National Flood Insurance Program claims, with an average payout of $20,728 and an average water depth of 2.7 feet. Properties in Zone X and Zone X_Unshaded have also filed claims, though with lower average payouts and water depths. Homeowners and real estate agents in areas designated as Zone A, as well as those located near rivers and waterways, should pay the most attention to flood risk.
Summary generated from NOAA storm narratives and NFIP claim data for this county. Not predictive.
55 NOAA storm reports from this county describe what happened, in the words of the meteorologists who were there.
Trempealeau County, Wisconsin has recorded 102 flood-related events since 1996 according to NOAA's Storm Events Database, including 21 flash floods and 81 river or area floods. The county has received 15 federal disaster declarations, 3 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 And Flooding | Severe Storm | Sep 22, 2010 |
| Hurricane Katrina Evacuation | Hurricane | Aug 29, 2005 |
| Severe Storms And Flooding | Severe Storm | May 7, 2004 |
| Flooding, Severe Storms And Tornadoes | Flood | Apr 10, 2001 |
| Severe Storms,straigh Line Winds, Tornadoes,rain,and Floodi | Severe Storm | Jun 18, 1998 |
| Severe Storms, Tornadoes & Flooding | Severe Storm | Jun 7, 1993 |
| Severe Storms & Flooding | Flood | Sep 14, 1992 |
NOAA Storm Events Database (1996–2025)
Source: NOAA National Weather Service Storm Events Database.
| Type | Date | Damage |
|---|---|---|
| Flood | Aug 19, 2025 | 0.00K |
| Flood | Jun 24, 2024 | 0.00K |
| Flood | Jun 23, 2024 | 0.00K |
| Flood | Jul 16, 2024 | 0.00K |
| Flash Flood | Jul 14, 2024 | 0.00K |
| Flood | Jul 1, 2024 | 70.00K |
| Flood | Oct 26, 2023 | 0.00K |
| Flood | Oct 25, 2023 | 15.00K |
| Flood | Oct 25, 2023 | 0.00K |
| Flood | Apr 21, 2023 | 0.00K |
Flood — Aug 19, 2025
Heavy rainfall during the middle of August resulted in minor flooding along portions of the Trempealeau and Platte rivers in Western Wisconsin.
Flood — Jun 24, 2024
Above normal rainfall over the course of June in combination with a robust rainfall event between June 20th and 22nd led to widespread river flooding across portions of western Wisconsin. Rainfall amounts upwards of 5 inches between the 20th and 22nd allowed the Mississippi River and many other river basins in western Wisconsin to enter flood stage towards the end of June. Flooding along the Mi...
Flood — Jun 23, 2024
Above normal rainfall over the course of June in combination with a robust rainfall event between June 20th and 22nd led to widespread river flooding across portions of western Wisconsin. Rainfall amounts upwards of 5 inches between the 20th and 22nd allowed the Mississippi River and many other river basins in western Wisconsin to enter flood stage towards the end of June. Flooding along the Mi...
Flood — Jul 16, 2024
Rounds of thunderstorms during the middle of July led to increased runoff across portions of western Wisconsin. As a result, several river basins rose into flood stage with the passage of these storms. Most notably, the Kickapoo River at Ontario entered major flood stage with a river stage of just under 20 feet.
Flash Flood — Jul 14, 2024
After midnight on July 14th, a line of thunderstorms moved across portions of western Wisconsin. As these storms moved over already saturated soils from storms a few hours prior, susceptible areas noted flooding and rock slides particularly in Trempealeau and Monroe Counties.
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 Trempealeau 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 Trempealeau 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.