O'Brien County, IA
FEMA National Risk Index scores, disaster declarations & hazard data
O'Brien County has experienced 15 federally declared disasters since 1965, most recently Severe Storms, Flooding, Straight-Line Winds, And Tornadoes in 2024. Its overall natural hazard risk is rated Very Low — among the lowest-risk counties in the country.
O'Brien County's highest-rated hazards are hail, drought, and winter weather, with its top risk rated "Relatively Moderate" by FEMA's National Risk Index. NOAA records 122 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. O'Brien County has been designated in 15 declarations since 1965, covering 6 disaster types including severe storm (6), flood (4), biological (2).
| Year | Type | Event name |
|---|---|---|
| 2024 | Severe Storm | Severe Storms, Flooding, Straight-Line Winds, And Tornadoes |
| 2020 | Biological | Covid-19 Pandemic |
| 2020 | Biological | Covid-19 |
| 2019 | Flood | Severe Storms And Flooding |
| 2018 | Severe Storm | Severe Storms, Tornadoes, Straight-Line Winds, And Flooding |
| 2013 | Severe Storm | Severe Winter Storm |
| 2013 | Severe Storm | Severe Storms, Tornadoes, And Flooding |
| 2010 | Severe Storm | Severe Winter Storms And Snowstorm |
| 2010 | Severe Storm | Severe Storms, Flooding, And Tornadoes |
| 2007 | Snowstorm | Snow |
Showing the 10 most recent of 15 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 | 12.7 | 0 | 0 | — |
| Inland Flooding | Very Low | 18.5 | 55 | 0 | $2.8M |
| Coastal Flooding | Not Applicable | — | 0 | 0 | — |
| Earthquake | Very Low | 9.8 | — | — | — |
| Heat Wave | Very Low | 21 | 18 | 0 | — |
| Tornado | Relatively Low | 48.7 | 3 | 0 | $50K |
| Hurricane | Not Applicable | — | 0 | 0 | — |
| Hail | Relatively Moderate | 82.2 | 46 | 0 | — |
| Strong Wind | Relatively Low | 29.6 | 0 | 0 | — |
| Winter Weather | Relatively Moderate | 66.3 | 0 | 0 | — |
| Ice Storm | Relatively Low | 42.7 | — | — | — |
| Cold Wave | Relatively Low | 47.3 | — | — | — |
| Lightning | Very Low | 18.6 | 0 | 0 | — |
| Drought | Relatively Moderate | 67.1 | 0 | 0 | — |
| Landslide | Very Low | 14.2 | 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
O'Brien County ranks in the 37th percentile (Low) 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 | 37th | Low |
| Socioeconomic status | 12th | Very low |
| Household characteristics | 60th | Moderate |
| Racial & ethnic minority status | 27th | Low |
| Housing type & transportation | 78th | 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 | 12th | Very Low |
| Risk to homes | 14th | Very Low |
| Buildings in direct exposure zone | 33.0% | — |
NOAA tracked 122 weather events in this county over 2016–2025: 63 in 2016–20 vs 59 in 2021–25 (-6% — relatively stable).
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 O'Brien County?
According to the FEMA National Risk Index, the highest-risk hazards in O'Brien County, Iowa are hail, drought, and winter weather. The county's overall natural hazard risk is rated Very Low — among the lowest-risk counties in the country.
Has O'Brien County received federal disaster declarations?
Yes. O'Brien County has received 15 federal disaster declarations since 1965, including declarations in 2024. The most common disaster type on record is severe storm (6 declarations).
Has O'Brien County had any FEMA disaster declarations in 2024, 2025, or 2026?
Yes. Recent federal disaster declarations for O'Brien County include Severe Storms, Flooding, Straight-Line Winds, And Tornadoes (2024). See the declarations table above for the full history since 1965.
How does O'Brien County's natural hazard risk compare to nearby counties?
Among neighboring counties, Sioux County, IA has the highest overall natural hazard risk (Relatively Low) and Osceola County, IA has the lowest (Very Low). O'Brien County is rated Very Low overall.
How is O'Brien County's composite disaster risk index calculated?
O'Brien 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. O'Brien County's composite score of 16 means its overall natural hazard risk is higher than 16% of US counties.