Enter any address in Warren County, Illinois to see its FEMA flood zone
Flash flooding from thunderstorms is the dominant flood character in Warren County, IL. Between 2003 and 2023, NOAA Storm Events data recorded 19 flash flood events and 7 general flood events. For example, heavy rains caused flash flooding near Roseville, IL on May 13, 2022, and continuous storms led to significant flash flooding on September 27, 2019.
National Flood Insurance Program (NFIP) claims data indicates that properties in Zone A have experienced the most claims, with an average payout of $5,768 and an average water depth of 4.5 feet. Properties in Zone UNKNOWN also saw substantial payouts, averaging $14,962 with 0.7 feet of water. Homeowners in Zone A and Zone UNKNOWN, as well as those without a Base Flood Elevation (BFE) determination, should pay the most attention to flood risk.
Summary generated from NOAA storm narratives and NFIP claim data for this county. Not predictive.
5 NOAA storm reports from this county describe what happened, in the words of the meteorologists who were there.
Warren County, Illinois has recorded 26 flood-related events since 1996 according to NOAA's Storm Events Database, including 19 flash floods and 7 river or area floods. The county has received 9 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 (1993–2023)
Source: OpenFEMA Disaster Declarations Summaries.
| Declaration | Type | Date |
|---|---|---|
| Severe Storms And Flooding | Severe Storm | Jun 29, 2023 |
| Covid-19 | Biological | Jan 20, 2020 |
| Covid-19 Pandemic | Biological | Jan 20, 2020 |
| Severe Storms, Straight-line Winds, And Flooding | Flood | Apr 16, 2013 |
| Severe Winter Storm And Snowstorm | Snowstorm | Jan 31, 2011 |
| Severe Storms And Flooding | Severe Storm | Aug 20, 2007 |
| Hurricane Katrina Evacuation | Hurricane | Aug 29, 2005 |
| Winter Storm 1/1/99 | Snowstorm | Jan 1, 1999 |
| Severe Storms & Flooding | Flood | Apr 13, 1993 |
NOAA Storm Events Database (1996–2025)
Source: NOAA National Weather Service Storm Events Database.
| Type | Date | Damage |
|---|---|---|
| Flash Flood | May 13, 2022 | 0.00K |
| Flash Flood | May 15, 2020 | 0.00K |
| Flash Flood | Sep 27, 2019 | 0.00K |
| Flash Flood | Jul 10, 2017 | 0.00K |
| Flash Flood | Jul 16, 2015 | 0.00K |
| Flash Flood | May 25, 2011 | 0.00K |
| Flash Flood | Jun 23, 2010 | 0.00K |
| Flash Flood | Jun 5, 2010 | 0.00K |
| Flash Flood | May 15, 2009 | 0.00K |
| Flash Flood | Aug 9, 2009 | 0.00K |
Flash Flood — May 13, 2022
A line of showers and thunderstorms developed during the late afternoon of Friday, May 13, 2022 generally along and east of the Mississippi River in northwest Illinois. Some thunderstorms did become severe along that line, and produced all modes of severe weather including hail up to one inch, wind gusts to 60 MPH and three landspout tornadoes. One occurred near Good Hope IL, with the other two...
Flash Flood — May 15, 2020
Showers and thunderstorms tracked across central Iowa into eastern Iowa, northeast Missouri, and northwest Illinois late Friday afternoon and into the overnight hours. These storms brought heavy rain, frequent lightning, damaging winds, and large hail to the region. The hardest hit areas were Keokuk county in Iowa, towards Henry county in Iowa, where 50-70 mph winds occurred. A weak EF-1 torn...
Flash Flood — Sep 27, 2019
The evening of September 27th, a wave of low pressure moved along a stationary front in eastern Iowa and northwest Illinois, bringing several rounds of strong to severe thunderstorms, and tremendously heavy rains. This resulted in some reports of large hail, but mostly very heavy rain totals over 3 inches. Flash flooding became the primary threat late in the evening, as the storms became contin...
Flash Flood — Jul 10, 2017
A stalled boundary produced a couple of rounds of severe storms from the early morning lasting into the afternoon with very heavy rain producing flash flooding, several reports of damaging winds of 60 to 70 mph, and isolated, large hail.
Flash Flood — Jul 16, 2015
A wave on a northward moving warm front produced scattered thunderstorms along the boundary. Low level shear was favorable for severe weather and tornadoes.
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 Warren County, Illinois:
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 Warren County, Illinois 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.