Marshall County, IA
FEMA National Risk Index scores, disaster declarations & hazard data
Marshall County has experienced 20 federally declared disasters since 1965, most recently Severe Storms, Tornadoes, And Flooding in 2024. Its overall natural hazard risk is rated Relatively Low — lower risk than most US counties.
Marshall County's highest-rated hazards are drought, strong wind, and winter weather, with its top risk rated "Relatively High" by FEMA's National Risk Index. NOAA records 54 storm events in the county over the past decade.
Past disasters & FEMA designations
A federal disaster declaration officially designates a county for FEMA disaster assistance. Marshall County has been designated in 20 declarations since 1965, covering 4 disaster types including flood (9), severe storm (8), biological (2).
| Year | Type | Event name |
|---|---|---|
| 2024 | Severe Storm | Severe Storms, Tornadoes, And Flooding |
| 2020 | Severe Storm | Severe Storms |
| 2020 | Biological | Covid-19 Pandemic |
| 2020 | Biological | Covid-19 |
| 2019 | Flood | Severe Storms And Flooding |
| 2018 | Severe Storm | Severe Storm And Tornadoes |
| 2013 | Severe Storm | Severe Storms, Tornadoes, And Flooding |
| 2011 | Severe Storm | Severe Storms, Straight-Line Winds, And Flooding |
| 2008 | Severe Storm | Severe Storms, Tornadoes, And Flooding |
| 2007 | Severe Storm | Severe Winter Storms |
Showing the 10 most recent of 20 total declarations since 1965.
Source: FEMA OpenFEMA Disaster Declarations Summaries. A single disaster can produce more than one record per county. Data current through September 2026.
Risk by hazard type
| Hazard | Risk rating | Risk score | Recorded events | Deaths | Prop. damage |
|---|---|---|---|---|---|
| Wildfire | Very Low | 62.1 | 0 | 0 | — |
| Inland Flooding | Relatively Low | 63.1 | 12 | 0 | $2.3M |
| Coastal Flooding | Not Applicable | — | 0 | 0 | — |
| Earthquake | Very Low | 27.5 | — | — | — |
| Heat Wave | Very Low | 10.1 | 2 | 0 | — |
| Tornado | Relatively Moderate | 82.7 | 6 | 0 | $200.0M |
| Hurricane | Very Low | 15.2 | 0 | 0 | — |
| Hail | Relatively Moderate | 80.9 | 33 | 0 | $117K |
| Strong Wind | Relatively High | 86 | 0 | 0 | — |
| Winter Weather | Relatively Moderate | 84.7 | 0 | 0 | — |
| Ice Storm | Relatively Low | 50.1 | — | — | — |
| Cold Wave | Relatively Low | 41.2 | — | — | — |
| Lightning | Relatively Low | 26.3 | 1 | 0 | $4K |
| Drought | Relatively High | 97.9 | 0 | 0 | — |
| Landslide | Very Low | 51 | 0 | 0 | — |
| Avalanche | Not Applicable | — | — | — | — |
| Tsunami | Not Applicable | — | — | — | — |
| Volcanic Activity | Not Applicable | — | — | — | — |
Scores are 0–100 percentiles relative to all US counties — higher means more exposed, not that a disaster is likely this year. Event counts: NOAA Storm Events 2016–2026; earthquake counts from USGS ComCat (M3.0+, 1996–2026). See the methodology page for details.
Community vulnerability
Marshall County ranks in the 68th percentile (Moderate) for community vulnerability — a measure of how hard disaster impacts tend to hit residents. Higher vulnerability means more displacement, worse health outcomes, and slower recovery after a disaster.
| SVI theme | Percentile | Vulnerability level |
|---|---|---|
| Overall | 68th | Moderate |
| Socioeconomic status | 41st | Low |
| Household characteristics | 68th | Moderate |
| Racial & ethnic minority status | 70th | Moderate |
| Housing type & transportation | 86th | High |
Source: CDC/ATSDR Social Vulnerability Index 2022. Percentiles compare counties nationally — higher means more vulnerable relative to other counties. See CDC SVI for full methodology.
Future risk outlook
| Wildfire metric | National percentile | Level |
|---|---|---|
| Burn probability | 36th | Relatively Low |
| Risk to homes | 35th | Relatively Low |
| Buildings in direct exposure zone | 31.1% | — |
NOAA tracked 54 weather events in this county over 2016–2025: 29 in 2016–20 vs 25 in 2021–25 (-14% — frequency decreasing).
Wildfire: USDA Forest Service Wildfire Risk to Communities (RDS-2020-0016-2) — modeled values, not annual forecasts. See wildfirerisk.org. Inland flood and heat projections pending data availability; coastal sea-level projections are available for select coastal counties below — see the data page.
Nearby counties
Frequently asked questions
What natural hazards pose the greatest risk in Marshall County?
According to the FEMA National Risk Index, the highest-risk hazards in Marshall County, Iowa are drought, strong wind, and winter weather. The county's overall natural hazard risk is rated Relatively Low — lower risk than most US counties.
Has Marshall County received federal disaster declarations?
Yes. Marshall County has received 20 federal disaster declarations since 1965, including declarations in 2024. The most common disaster type on record is flood (9 declarations).
Has Marshall County had any FEMA disaster declarations in 2024, 2025, or 2026?
Yes. Recent federal disaster declarations for Marshall County include Severe Storms, Tornadoes, And Flooding (2024). See the declarations table above for the full history since 1965.
How does Marshall County's natural hazard risk compare to nearby counties?
Among neighboring counties, Story County, IA has the highest overall natural hazard risk (Relatively Low) and Grundy County, IA has the lowest (Very Low). Marshall County is rated Relatively Low overall.
How is Marshall County's composite disaster risk index calculated?
Marshall County's composite disaster risk index — officially FEMA's National Risk Index (NRI) — scores every US county on a 0–100 percentile scale across 18 natural hazard types, factoring in expected annual loss, social vulnerability, and community resilience. Marshall County's composite score of 63 means its overall natural hazard risk is higher than 63% of US counties.