FEMA Records
21
Above median
Iowa · FEMA + NOAA + National Risk Index
Hamilton County, IA
21 FEMA disaster declarations (1965-2024), with a FEMA National Risk Index rating of Relatively Low. Most common hazard: Severe Storm.
- 21
- FEMA declarations
- 19
- Major disasters
- 43
- NRI risk · Relatively Low
- Severe Storm
- Top hazard
The verdict
Two federal records point in the busier direction for Hamilton County. Its 21 FEMA declarations are 9% above the Iowa county mean and exceed the count for 52% of the 3,266 counties in this registry. Separately, FEMA's National Risk Index places it safer than 43%, based on modeled expected annual loss, social vulnerability, and community resilience.
- Safer than 43%
- of U.S. counties for FEMA National Risk Index score
- Relatively Low
- FEMA National Risk Index rating
- 21
- FEMA declarations vs 21 national county avg
- 28
- NFIP flood insurance claims filed
FEMA's National Risk Index and its declaration registry are separate measures. This county's registry includes Major Disaster (DR) and Emergency (EM) records; an EM authorizes a narrower set of federal assistance than a DR.
FEMA OpenFEMA declaration desk
County FIPS 19079 · Hamilton County 21 declarations · rank 1564/3,266
DECL-HEAVY · MAJOR-HEAVY · RANK-LOWER · PHOTO-FINISH · NRI-LOW · ACT-HIGH · TYPE-LEAD · VS-ST-ABOVE
- DECL-HEAVY 21
- MAJOR-HEAVY 90%
- RANK-LOWER #1,564
- PHOTO-FINISH Montgomery
- NRI-LOW 43
- ACT-HIGH High
- TYPE-LEAD Severe Storm
- VS-ST-ABOVE +9%
Nearest declaration peer: Montgomery, IN (0 declaration gap)
FEMA Disaster Declarations Summaries v2 filing stamps for this county register. Read with this county → · Iowa state profile
Hamilton County in the declaration-count neighbourhood
FEMA declaration records among Hamilton County and nearest peers by total count
- Los Angeles · largest
Los Angeles · largest
88 declarations
- Atascosa · near 21
Atascosa · near
21 declarations
- Hamilton · this county 21
Hamilton · this county
21 declarations
- Mason · near 21
Mason · near
21 declarations
- Montgomery · near 21
Montgomery · near
21 declarations
- Ujelang · smallest 1
Ujelang · smallest
1 declarations
What this shows Hamilton County carries 21 FEMA declaration records, ranked 1564 of 3,266 counties in this registry.
How Hamilton County's FEMA declaration count compares nationally
Hamilton County vs. all counties in this dataset
FEMA disaster declarations, all-time · Hamilton County
21 Top 48% higher than 52% of 3,266 counties
Each bar is a band; taller bars hold more counties. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count, share, and where it sits relative to this entry.
Source FEMA Disaster Declarations Summaries v2 · 2026-08-25
Hamilton County's FEMA Risk Index score
Which hazard drives modeled loss here?
FEMA's modeled annual dollar loss for Hamilton County is led by Riverine Flooding (about $5.8M Expected Annual Loss, Historical Loss Ratio Very High), while Drought carries the highest National Risk Index rating (Relatively High). EAL and risk score use different inputs; they need not agree.
Source: FEMA National Risk Index (December 2025 release) - Expected Annual Loss vs composite risk rating by hazard.
What does Hamilton County's hazard record show?
FEMA National Risk Index
FEMA's data shows an elevated National Risk Index composite of 42.9/100 for this county (Relatively Low rating). Expected Annual Loss comes in at Relatively Low (roughly $15.5M in annualized losses). Social vulnerability (Relatively Low) and community resilience (Relatively High) both factor into how that raw exposure plays out on the ground. Of the 18 hazards FEMA models, Drought stands out as the sharpest exposure here, rated Relatively High. FEMA's modeled frequency puts that hazard at 11 modeled event-days per year here, based on 329 historical events on record.
Reading the federal records together
This county has a small entry in FEMA's NFIP paid-claims table: 28 claims and $189.5K paid in total. PlainHazard calls 1-49 claims a light registry record, a label for this dataset rather than a finding that flood exposure is low. A short claims history can also reflect insurance take-up, the period covered, or losses that were never insured.
The declaration register points in the busier direction. Hamilton County's 21 federal records stand 9% above the Iowa county mean of 19.3. That comparison describes how often federal action was recorded, including any Major Disaster, Emergency, and Fire Management entries shown on this page; it does not convert the count into future probability.
67 /100
Historical Activity Index
High historical activity
Hamilton County, IA · PlainHazard-derived composite from federal records
This 0–100 index is an explicit PlainHazard composite from FEMA declaration history only on the county surface (this DB has no county-level NOAA damage row) . It is not FEMA's National Risk Index, not a forecast, and not a safety, insurance, or preparedness rating. Open the calculator · Methodology
FEMA Declarations (1953–present) High
15/30
21 OpenFEMA declarations, full ingest window (1.0x national county average)
County Disaster Density High
14/25
21 declarations (1.1x state county average of 19)
Major Disaster Share Very High
23/25
19 of 21 declarations are major disasters (90%)
Hazard Diversity Very High
15/20
6 different disaster types declared in Hamilton County
FEMA NRI 8-hazard radar - Hamilton County
How to read this radar
Each axis: NRI risk rating (Very Low-Very High) on a 0-100 scale. Rounder = broad exposure; spiky = one or two hazards dominate.
Major Disaster share
90%
Mostly major
NRI risk score
43
Relatively Low
Source: FEMA National Risk Index Per-county per-hazard ratings, December 2025 release
How often does each hazard strike Hamilton County?
FEMA's National Risk Index models a historical event count and an annualized frequency for each hazard type. Most hazards are expressed as modeled occurrences per year; FEMA expresses drought and heat-wave frequency as event-days per year. These modeled frequencies are not forecasts.
| Hazard | NRI Risk Rating | Recurrence |
|---|---|---|
| Drought | Relatively High | 11 modeled event-days per year |
| Hail | Relatively Low | an average of 5.7 times per year |
| Strong Wind | Relatively Moderate | an average of 5.4 times per year |
| Winter Weather | Relatively Moderate | an average of 17 times per year |
| Tornado | Relatively Low | roughly once every 2 years |
| Cold Wave | Relatively Low | an average of 9.3 times per year |
| Riverine Flooding | Relatively Low | an average of 2.2 times per year |
| Ice Storm | Relatively Low | roughly once every 2 years |
| Landslide | Very Low | roughly once every 14 years |
| Hurricane | Very Low | roughly once every 100 years |
| Lightning | Very Low | an average of 42 times per year |
| Earthquake | Very Low | roughly once every 1,773 years |
| Wildfire | Very Low | roughly once every 9,621 years |
| Heat Wave | Very Low | 4.2 modeled event-days per year |
Source: FEMA National Risk Index Modeled annualized frequency; drought and heat wave use event-days/year, December 2025 release
Disaster Types
Severe Storm 9
Flood 7
Biological 2
Hurricane 1
Severe Ice Storm 1
Tornado 1
What Severe Storm declarations mean here
Severe Storm is the most frequent declaration type on Hamilton County's record, 43% of its declarations. In FEMA's vocabulary this covers convective weather: thunderstorm straight-line winds, large hail, and the multi-day outbreaks that often carry embedded tornadoes. Activity is heaviest in spring and summer, though the season varies by region.
These events behave differently from a hurricane on paper. Damage tends to be distributed along a storm track rather than concentrated on a coastline, and a declaration typically follows an outbreak that crossed several counties over a few days, not a single point of impact. Because the qualifying threshold is the cost of uninsured public and individual losses rather than storm intensity, two similar storms can produce a declaration in one year and none in another.
Declaration counts describe past federal action. They are a record of what was declared, not a forecast of future hazard probability.
Declaration Types
What DR / EM / FM mean
FEMA categorizes declarations as Major Disasters (DR), Emergencies (EM), or Fire Management Assistance (FM).
Major Disaster - 19 90.5%
of all 21 declarations
Emergency - 2 9.5%
of all 21 declarations
FEMA Declarations Timeline
| Year | Declarations | |
|---|---|---|
| 2024 | 1 | |
| 2022 | 1 | |
| 2020 | 2 | |
| 2019 | 1 | |
| 2018 | 1 | |
| 2014 | 1 | |
| 2010 | 1 | |
| 2008 | 1 | |
| 2007 | 1 | |
| 2005 | 1 | |
| 2004 | 1 | |
| 1998 | 1 | |
| 1996 | 1 | |
| 1993 | 1 | |
| 1992 | 1 | |
Show 5 earlier declaration years
| 1991 | 1 | |
| 1990 | 1 | |
| 1979 | 1 | |
| 1969 | 1 | |
| 1965 | 1 | |
Disaster Declarations
How the 21 FEMA declarations break into federal action codes (DR / EM / FM). Same DISTINCT grain as the table below.
Download these 21 declarations as CSV . FEMA source data is public domain; our derived presentation is CC0.
| DR# | Title | Type | Incident | Date |
|---|---|---|---|---|
| 4784 | SEVERE STORMS, TORNADOES, AND FLOODING | DR | Severe Storm | 2024-05-24 |
| 4642 | SEVERE STORMS, STRAIGHT-LINE WINDS, AND TORNADOES | DR | Severe Storm | 2022-02-23 |
| 4483 | COVID-19 PANDEMIC | DR | Biological | 2020-03-23 |
| 3480 | COVID-19 | EM | Biological | 2020-03-13 |
| 4421 | SEVERE STORMS AND FLOODING | DR | Flood | 2019-03-23 |
| 4386 | SEVERE STORMS, TORNADOES, STRAIGHT-LINE WINDS, AND FLOODING | DR | Severe Storm | 2018-08-20 |
| 4187 | SEVERE STORMS, TORNADOES, STRAIGHT-LINE WINDS, AND FLOODING | DR | Severe Storm | 2014-08-05 |
| 1930 | SEVERE STORMS, FLOODING, AND TORNADOES | DR | Severe Storm | 2010-07-29 |
| 1763 | SEVERE STORMS, TORNADOES, AND FLOODING | DR | Severe Storm | 2008-05-27 |
| 1688 | SEVERE WINTER STORMS | DR | Severe Storm | 2007-03-14 |
| 3239 | HURRICANE KATRINA EVACUATION | EM | Hurricane | 2005-09-10 |
| 1518 | SEVERE STORMS, TORNADOES, AND FLOODING | DR | Severe Storm | 2004-05-25 |
| 1230 | SEVERE STORMS, TORNADOES AND FLOODING | DR | Flood | 1998-07-02 |
| 1133 | SEVERE STORMS, AND FLOODING | DR | Severe Storm | 1996-08-21 |
| 996 | SEVERE STORMS & FLOODING | DR | Flood | 1993-07-09 |
| 928 | ICE STORM | DR | Severe Ice Storm | 1991-12-26 |
| 911 | SEVERE STORMS & FLOODING | DR | Flood | 1991-07-12 |
| 868 | SEVERE STORMS & FLOODING | DR | Flood | 1990-05-26 |
| 590 | HIGH WINDS & TORNADOES | DR | Tornado | 1979-07-01 |
| 269 | HEAVY RAINS & FLOODING | DR | Flood | 1969-08-14 |
Show 1 earlier declaration records
| DR# | Title | Type | Incident | Date |
|---|---|---|---|---|
| 193 | FLOODING | DR | Flood | 1965-04-22 |
Storm Events in Iowa
Statewide NOAA context only. PlainHazard does not currently attribute these state totals to Hamilton County.
| Storm Type | Events | Fatalities | Injuries | Property Damage |
|---|---|---|---|---|
| Thunderstorm Wind | 4,928 | 6 | 227 | $40.5M |
| Hail | 3,736 | 0 | 0 | $4.3M |
| Heavy Rain | 2,394 | 0 | 0 | $292.0K |
| Drought | 1,556 | 0 | 0 | $0 |
| Winter Storm | 1,543 | 3 | 4 | $2.8M |
Source: NOAA Storm Events Database State-level aggregated data, 2015-2025
NFIP Flood Insurance Claims
Total Claims
28
Total Paid
$189.5K
Avg Per Claim
$6.8K
Source: FEMA National Flood Insurance Program (NFIP) OpenFEMA Claims Data
FEMA National Risk Index
Overall Risk
Relatively Low
Score: 42.9/100
Expected Annual Loss
Relatively Low
$15.5M/year
Social Vulnerability
Relatively Low
Community Resilience
Relatively High
Hazard Risk Breakdown
Drought Relatively High
Hail Relatively Low
Strong Wind Relatively Moderate
Winter Weather Relatively Moderate
Tornado Relatively Low
Cold Wave Relatively Low
Riverine Flooding Relatively Low
Ice Storm Relatively Low
Landslide Very Low
Hurricane Very Low
Lightning Very Low
Earthquake Very Low
Wildfire Very Low
Heat Wave Very Low
Source: FEMA National Risk Index (NRI) Ratings reflect relative scores among all US counties. Data: hazards.fema.gov/nri
The model's sharpest exposure here: Drought
Drought is the slowest of the modeled hazards and the least visible: it does its damage to agriculture, water supply and soil over seasons rather than hours, so it rarely produces the kind of single-day damage that drives a disaster declaration. FEMA scores it in event-days per year rather than discrete events for exactly that reason.
Worth noting for Hamilton County: the model and the federal record do NOT point at the same hazard. Drought carries the highest modeled rating (Relatively High), while the county's declaration history is led by Severe Storm. That is not a contradiction, the two measure genuinely different things. Declarations record federal ACTION, which requires damage costly enough to exceed state and local capacity; the Risk Index models EXPECTED annual loss across all 18 hazards whether or not any declaration ever followed. A hazard can be the county's largest modeled exposure and never once have driven a declaration.
National Risk Index ratings are modeled estimates of expected annual loss, not predictions of what will happen in any given year.
Data-matched county comparisons
Hamilton County's closest FEMA peer: Freeborn County, MN
Comparisons use published FEMA declaration fields plus the National Risk Index composite for Hamilton County. Record similarity, not a safety rating.
Closest declaration profiles
Hamilton County shows 21 FEMA declarations, led by Severe Storm.
Similar Major-disaster share
Hamilton County: 19 of 21 of its declarations are Major.
Similar modeled NRI score
Hamilton County: NRI composite 42.9 (Relatively Low).
How these peers are chosen
Cohort: Published U.S. county equivalents outside the source state or territory. Each metric keeps six ETL candidates; three unique destinations are shown after de-duplicating across axes. Declaration-volume ranking combines count and Major-disaster share and prefers a different leading incident type; Major-share ranks the Major fraction adjusted for volume; NRI ranks the modeled composite score only.
Retained FEMA snapshot feed for Hamilton County - capture-dated entries only.
Compare beyond this state
Nationwide peers by NRI score & FEMA declaration volume
Two PlainHazard-derived comparison paths for Hamilton County: nearest out-of-state National Risk Index composite and nearest FEMA declaration count (floor ≥5 records). Record similarity only, not a forecast of the next hazard.
Similar NRI composite
Nearest out-of-state counties by FEMA NRI score. This county: 42.9 (Relatively Low).
Similar declaration volume
Nearest out-of-state counties by FEMA declaration count. This county: 21. NRI peers are excluded so the two link sets stay distinct.
Further reading for this county
Most disaster-prone counties
With 21 FEMA declarations, Hamilton County sits in the high-volume declaration band - see how that count ranks against other U.S. counties.
More PlainHazard guides
- Most disaster-prone counties - U.S. counties ranked by FEMA declaration totals.
- Understanding disaster data - declarations vs storm events vs NRI scores.
- Preparing for natural disasters - household checklist (not county-specific advice).
Frequently Asked Questions
What is the most common disaster type in Hamilton County?
The most common disaster type in Hamilton County is Severe Storm, with 9 declarations. Other disaster types include Flood (7), Biological (2), Hurricane (1).
How does Hamilton County's FEMA declaration record compare with the Iowa average?
FEMA lists 21 declaration records for Hamilton County. That is 9% above the Iowa county mean of 19.3. Its count is also 1% above the national county mean of 20.7. A larger declaration history records more federal actions; it is not a forecast of the county's next hazard.
How many major FEMA disaster declarations has Hamilton County received?
Hamilton County has received 19 major disaster declarations, representing 90% of all 21 disaster declarations.
How many flood insurance claims has Hamilton County filed?
Hamilton County has 28 National Flood Insurance Program (NFIP) claims totaling $189.5K in payments, with an average of $6.8K per claim.
Does FEMA's top risk-rated hazard match the highest Expected Annual Loss in Hamilton County?
No. In Hamilton County, Drought has the highest National Risk Index rating (Relatively High), while Riverine Flooding leads Expected Annual Loss at about $5.8M. FEMA's risk score and dollar-loss model use different inputs, so the leaders often differ.
What was the worst year for disasters in Hamilton County?
The most active year for disaster declarations in Hamilton County was 2020, with 2 declarations. The county has FEMA disaster data spanning 1965 to 2024.
What is the FEMA National Risk Index score for Hamilton County?
According to the FEMA National Risk Index, Hamilton County, Iowa has an overall risk score of 42.9 out of 100 (Relatively Low). The county's social vulnerability rating is Relatively Low and community resilience is Relatively High. The Expected Annual Loss (EAL) score is Relatively Low, representing $15.5M in annualized losses.
Which natural hazard poses the greatest risk to Hamilton County?
FEMA's NRI data points to Hamilton County as of the latest release is Drought (risk rating: Relatively High). Other significant hazards include Hail (Relatively Low) and Strong Wind (Relatively Moderate). FEMA's modeled event frequency puts drought here at 11 modeled event-days per year, drawn from 329 historical events on record. The underlying methodology weighs historical event frequency against exposed assets and community vulnerability.
Data Sources & Methodology
Disaster declaration data comes from the FEMA OpenFEMA Disaster Declarations Summaries v2 API, which includes all federally declared disasters, emergencies, and fire management assistance grants.
Storm event data is sourced from the NOAA Storm Events Database (2015-2025), which tracks significant weather events including thunderstorms, tornadoes, floods, and winter storms.
Flood insurance data comes from the FEMA National Flood Insurance Program (NFIP) OpenFEMA claims dataset.
This data is provided for informational purposes only. FEMA disaster declarations represent federal response actions and may not capture all local emergencies or weather events.
FEMA OpenFEMA declarations + NRI for Hamilton County · vintage 2026-08-25 · Methodology · Iowa profile · Verify with FEMA OpenFEMA · Verify with NOAA Storm Events