Enter any address in Harrison County, Iowa to see its FEMA flood zone
River flooding along portions of the Missouri River is a significant flood character for Harrison County. Recent events include ongoing river flooding in early July 2024, following crests at the end of June, which led to closures of sections of I-29. In May 2023, training storms caused flash flooding, with one report of a severe wind gust.
National Flood Insurance Program (NFIP) data indicates that Zone A, typically areas with higher flood risk, has the highest number of claims at 149, with an average payout of $17,880 and an average water depth of 6.4 feet. Properties in Zone X_SHADED also show a notable number of claims with higher average payouts and water depths compared to Zone X. Homeowners in areas designated as Zone A, or those located near rivers and streams, should pay particular attention to flood risk.
Summary generated from NOAA storm narratives and NFIP claim data for this county. Not predictive.
15 NOAA storm reports from this county describe what happened, in the words of the meteorologists who were there.
Harrison County, Iowa has recorded 31 flood-related events since 1996 according to NOAA's Storm Events Database, including 11 flash floods and 20 river or area floods. The county has received 24 federal disaster declarations, 9 of which involved flooding or coastal storms. Enter any address above to check its FEMA flood zone designation.
FEMA Disaster Declarations (1965–2025)
Source: OpenFEMA Disaster Declarations Summaries.
| Declaration | Type | Date |
|---|---|---|
| Severe Winter Storm | Winter Storm | Mar 19, 2025 |
| Severe Storms, Flooding, Straight-line Winds, And Tornadoes | Severe Storm | Jun 16, 2024 |
| Severe Storms, Tornadoes, And Flooding | Severe Storm | May 20, 2024 |
| Severe Storms And Tornadoes | Tornado | Apr 26, 2024 |
| Covid-19 | Biological | Jan 20, 2020 |
| Covid-19 Pandemic | Biological | Jan 20, 2020 |
| Severe Storms And Flooding | Flood | Mar 12, 2019 |
| Flooding | Flood | May 25, 2011 |
| Severe Winter Storm | Severe Storm | Jan 19, 2010 |
| Severe Winter Storms And Snowstorm | Severe Storm | Dec 23, 2009 |
NOAA Storm Events Database (1996–2025)
Source: NOAA National Weather Service Storm Events Database.
| Type | Date | Damage |
|---|---|---|
| Flood | Jun 24, 2024 | 200.00K |
| Flash Flood | Jun 12, 2024 | 25.00K |
| Flood | Jul 1, 2024 | 0.00K |
| Flash Flood | May 12, 2023 | 500.00K |
| Flood | Mar 14, 2019 | 0.00K |
| Flood | Mar 13, 2019 | 2.20M |
| Flash Flood | Aug 20, 2018 | 0.00K |
| Flood | Jun 18, 2018 | 0.00K |
| Flood | Sep 1, 2014 | 5.00K |
| Flood | May 26, 2011 | 5.00K |
Flood — Jun 24, 2024
A series of shortwave troughs traversing the northern CONUS brought unsettled weather to the area for the end of June. On the 21st, a stationary front was draped across northeast Nebraska into Iowa. Ahead of one of the aforementioned shortwave troughs, several rounds of strong thunderstorms developed near this frontal zone and moved across northeast Nebraska. At 8 pm on the 21st, radar imagery ...
Flash Flood — Jun 12, 2024
On June 12th, a low-amplitude shortwave embedded in northwesterly flow aloft ejected out into the central Great Plains. At the surface, a surface low-pressure was noted in North Dakota with a cold front extending south into South Dakota. Ahead of this cold front, a surface trough extended from south-central Nebraska into northeast Nebraska. Isolated thunderstorms developed on this surface troug...
Flood — Jul 1, 2024
At the beginning of July, river flooding was still ongoing along portions of the Missouri River extending from east-central Nebraska/southwest Iowa to the southern Nebraska border. Most of the length of the river crested at the end of June, so the greatest impacts are addressed in June StormData. However, sections of I-29 and the I-29/I680 junction remained closed through the first week of July...
Flash Flood — May 12, 2023
A strong low-pressure system which had been moving slowly off the lee side of the Rocky Mountains had finally progressed into central Nebraska. This left western Iowa in the warm sector as a warm front moved north into the area. The SPC issued an Enhanced Risk for severe weather with a 30% hatched for severe hail. The severe weather mostly stayed west of the Missouri River. In Iowa, there was o...
Flood — Mar 14, 2019
A 971mb bomb cyclone moved out of the central Rockies on Wednesday, March 13, 2019 and helped to create widespread, moderate to major, and in many cases historic, flooding across eastern Nebraska and western Iowa. From 4 to 15 inches of snow cover remained across the mid Missouri River valley, and the ground was frozen with existing frost depths of 15 to 23 inches. Warm temperatures allowed all...
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, Iowa:
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, Iowa 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.