Enter any address in Harrison County, Indiana to see its FEMA flood zone
Flash flooding from heavy rainfall events is the dominant flood character in Harrison County. Between 1993 and 2023, NOAA Storm Events data recorded 39 flash flood events and 26 flood events. Recent examples include flash flooding on March 3, 2023, associated with a strong low-pressure system, and a flash flood event on August 13, 2020, where over 2.5 inches of rain in 30 minutes caused significant damage in Corydon.
National Flood Insurance Program (NFIP) claims data shows that properties in Zone A have experienced the most claims, with an average payout of $49,177 and an average water depth of 6.5 feet. Properties in Zone X also show a significant number of claims, with an average payout of $29,788 and an average water depth of 10.1 feet, despite fewer recorded claims than Zone A. Homeowners in Zone A and 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.
9 NOAA storm reports from this county describe what happened, in the words of the meteorologists who were there.
Harrison County, Indiana has recorded 65 flood-related events since 1996 according to NOAA's Storm Events Database, including 39 flash floods and 26 river or area floods. The county has received 21 federal disaster declarations, 5 of which involved flooding or coastal storms. Enter any address above to check its FEMA flood zone designation.
FEMA Disaster Declarations (1968–2026)
Source: OpenFEMA Disaster Declarations Summaries.
| Declaration | Type | Date |
|---|---|---|
| Severe Winter Storm | Winter Storm | Jan 23, 2026 |
| Severe Storms, Straight-line Winds, Tornadoes, And Flooding | Flood | Mar 30, 2025 |
| Covid-19 | Biological | Jan 20, 2020 |
| Covid-19 Pandemic | Biological | Jan 20, 2020 |
| Severe Storms And Flooding | Flood | Feb 14, 2018 |
| Severe Storms, Tornadoes, Straight-line Winds, And | Severe Storm | Apr 19, 2011 |
| Severe Winter Storm | Severe Storm | Jan 26, 2009 |
| Severe Storms And Flooding | Severe Storm | Sep 12, 2008 |
| Hurricane Katrina Evacuation | Hurricane | Aug 29, 2005 |
| Severe Winter Storms And Flooding | Severe Storm | Jan 1, 2005 |
NOAA Storm Events Database (1996–2025)
Source: NOAA National Weather Service Storm Events Database.
| Type | Date | Damage |
|---|---|---|
| Flood | Mar 25, 2023 | 0.00K |
| Flash Flood | Mar 3, 2023 | 0.00K |
| Flash Flood | Aug 13, 2020 | 150.00K |
| Flash Flood | Sep 8, 2018 | 0.00K |
| Flood | Apr 29, 2017 | 0.00K |
| Flood | Apr 27, 2016 | 0.00K |
| Flood | Dec 27, 2015 | 0.00K |
| Flash Flood | Jun 26, 2015 | 30.00K |
| Flash Flood | Jun 26, 2015 | 0.00K |
| Flood | Dec 23, 2015 | 0.00K |
Flood — Mar 25, 2023
During the evening and nighttime hours March 24th into March 25th, a mid-level trough moving from the central Plains into the Mississippi Valley amplified and became negatively tilted as it moved into the lower Ohio Valley. Low-level reflection of mid-level amplification manifested as a 50 knot low-level jet helped higher moisture air surge northward into southern Indiana during the late evenin...
Flash Flood — Mar 3, 2023
On March 3rd, 2023, a historically strong low pressure system moved across the lower Ohio Valley, bringing heavy rainfall, severe weather, and most notably, very strong gradient winds as it moved across the region. On the synoptic scale, a shortwave upper-level trough located over the mid-Mississippi Valley became negatively tilted during the morning hours of March 3rd. A 120 knot 500 mb jet de...
Flash Flood — Aug 13, 2020
During the day, a front remained parked near the Ohio River. This helped to produce heavy rainfall in storms that were nearly stationary. One of the storms occurred over Corydon, IN, where more than 2.5 inches of rain fell in 30 minutes, quickly overflowing storm sewers. Ponded water three to four feet in depth damaged several homes, businesses, and vehicles.
Flash Flood — Sep 8, 2018
On September 8th, the remnants of Tropical Storm Gordon was centered in southeast Missouri. Much of the moisture and energy from the system interacted with a stationary front running west to east through Kentucky. This produced efficient rainfall that caused flash flooding, and the environmental shear was strong enough to produce two tornadoes along the Ohio River in southern Indiana and north-...
Flood — Apr 29, 2017
An unseasonably warm and humid air mass developed across the lower Ohio Valley toward late April 2017. A powerful storm system across the central Plains brought several rounds of strong to severe thunderstorms to the region. Damaging winds and large hail occurred late on April 28 and into the morning hours April 29. Widespread rainfall of 3 to 6 inches fell across southern Indiana, resulting in...
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 Harrison County, Indiana:
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 Harrison County, Indiana 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.