FEMA Records
16
Below median
Wisconsin · FEMA + NOAA + National Risk Index
Rock County, WI
16 FEMA disaster declarations (1973-2026), with a FEMA National Risk Index rating of Relatively Moderate. Most common hazard: Severe Storm.
- 16
- FEMA declarations
- 11
- Major disasters
- 86
- NRI risk · Relatively Moderate
- Severe Storm
- Top hazard
The verdict
Two federal records point in the busier direction for Rock County. Its 16 FEMA declarations are 30% above the Wisconsin county mean and exceed the count for 27% of the 3,266 counties in this registry. Separately, FEMA's National Risk Index places it in the riskiest 14%, based on modeled expected annual loss, social vulnerability, and community resilience.
- Riskiest 14%
- of U.S. counties for FEMA National Risk Index score
- Relatively Moderate
- FEMA National Risk Index rating
- 16
- FEMA declarations vs 21 national county avg
- 304
- 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 55105 · Rock County 16 declarations · rank 2349/3,266
DECL-MID · MAJOR-MID · RANK-LOWER · PHOTO-FINISH · NRI-MID · ACT-HIGH · TYPE-LEAD · VS-ST-ABOVE
- DECL-MID 16
- MAJOR-MID 69%
- RANK-LOWER #2,349
- PHOTO-FINISH Greene
- NRI-MID 86
- ACT-HIGH High
- TYPE-LEAD Severe Storm
- VS-ST-ABOVE +30%
Nearest declaration peer: Greene, GA (0 declaration gap)
FEMA Disaster Declarations Summaries v2 filing stamps for this county register. Read with this county → · Wisconsin state profile
Rock County among counties with fewer federal records
FEMA declaration records among Rock County and nearest peers by total count
- Los Angeles · largest
Los Angeles · largest
88 declarations
- Frontier · near 16
Frontier · near
16 declarations
- Greene · near 16
Greene · near
16 declarations
- Rock · this county 16
Rock · this county
16 declarations
- Terrell · near 16
Terrell · near
16 declarations
- Ujelang · smallest 1
Ujelang · smallest
1 declarations
What this shows Rock County carries 16 FEMA declaration records, ranked 2349 of 3,266 counties in this registry.
Rock County versus quieter counties in this dataset
Rock County among lower-declaration counties nationally
FEMA disaster declarations, all-time · Rock County
16 27th percentile higher than 27% 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
Rock County's FEMA Risk Index score
Which hazard drives modeled loss here?
FEMA's modeled annual dollar loss for Rock County is led by Riverine Flooding (about $37.9M Expected Annual Loss, Historical Loss Ratio Relatively High), while Hail 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 Rock County's hazard record show?
Reading the federal records together
The NFIP claims register shows a middle-volume loss record here: 304 paid claims, totaling $4.4M. PlainHazard uses 50-499 claims for this descriptive band; FEMA does not publish it as a safety or coverage category. The $14.5K average describes payments on recorded claims only, leaving uninsured damage and properties without a claim outside the measure.
The declaration register points in the busier direction. Rock County's 16 federal records stand 30% above the Wisconsin county mean of 12.3. 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.
FEMA National Risk Index
This county sits among the highest-risk counties nationally on FEMA's National Risk Index, a composite score of 86.4/100 (Relatively Moderate). Expected Annual Loss is rated Relatively Moderate (roughly $73.3M in annualized losses). Social vulnerability reads Very Low and community resilience Very High, both critical modifiers of realized harm here. Of the 18 hazards FEMA models, Hail stands out as the sharpest exposure here, rated Relatively High. FEMA's modeled frequency puts that hazard at an average of 4.3 times per year here, based on 165 historical events on record.
60 /100
Historical Activity Index
High historical activity
Rock County, WI · 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) Moderate
12/30
16 OpenFEMA declarations, full ingest window (0.8x national county average)
County Disaster Density High
16/25
16 declarations (1.3x state county average of 12)
Major Disaster Share High
17/25
11 of 16 declarations are major disasters (69%)
Hazard Diversity Very High
15/20
6 different disaster types declared in Rock County
FEMA NRI 8-hazard radar - Rock 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
69%
Major-heavy
NRI risk score
86
Relatively Moderate
Source: FEMA National Risk Index Per-county per-hazard ratings, December 2025 release
How often does each hazard strike Rock 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 |
|---|---|---|
| Hail | Relatively High | an average of 4.3 times per year |
| Tornado | Relatively High | roughly once every 2 years |
| Cold Wave | Relatively High | an average of 5.4 times per year |
| Riverine Flooding | Relatively Moderate | an average of 2.1 times per year |
| Strong Wind | Relatively High | an average of 5.5 times per year |
| Lightning | Relatively High | an average of 38 times per year |
| Heat Wave | Relatively Moderate | 3.6 modeled event-days per year |
| Winter Weather | Relatively Moderate | an average of 14 times per year |
| Landslide | Very Low | roughly once every 8 years |
| Earthquake | Very Low | roughly once every 1,122 years |
| Ice Storm | Relatively Low | roughly once every 2 years |
| Drought | Relatively Low | 6.6 modeled event-days per year |
| Wildfire | Very Low | roughly once every 9,631 years |
| Hurricane | Very Low | roughly once every 174 years |
Source: FEMA National Risk Index Modeled annualized frequency; drought and heat wave use event-days/year, December 2025 release
Disaster Types
Severe Storm 7
Flood 3
Biological 2
Snowstorm 2
Hurricane 1
Drought 1
What Severe Storm declarations mean here
Severe Storm is the most frequent declaration type on Rock County's record, 44% 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 - 11 68.8%
of all 16 declarations
Emergency - 5 31.3%
of all 16 declarations
FEMA Declarations Timeline
| Year | Declarations | |
|---|---|---|
| 2026 | 1 | |
| 2020 | 2 | |
| 2008 | 2 | |
| 2007 | 1 | |
| 2005 | 1 | |
| 2004 | 1 | |
| 2001 | 1 | |
| 1998 | 1 | |
| 1993 | 1 | |
| 1990 | 1 | |
| 1978 | 1 | |
| 1976 | 2 | |
| 1973 | 1 | |
Disaster Declarations
How the 16 FEMA declarations break into federal action codes (DR / EM / FM). Same DISTINCT grain as the table below.
Download these 16 declarations as CSV . FEMA source data is public domain; our derived presentation is CC0.
| DR# | Title | Type | Incident | Date |
|---|---|---|---|---|
| 4923 | SEVERE STORMS, TORNADOES, AND FLOODING | DR | Flood | 2026-06-30 |
| 4520 | COVID-19 PANDEMIC | DR | Biological | 2020-04-04 |
| 3454 | COVID-19 | EM | Biological | 2020-03-13 |
| 1768 | SEVERE STORMS, TORNADOES, AND FLOODING | DR | Severe Storm | 2008-06-14 |
| 3285 | RECORD SNOW AND NEAR RECORD SNOW | EM | Snowstorm | 2008-03-19 |
| 1719 | SEVERE STORMS AND FLOODING | DR | Severe Storm | 2007-08-26 |
| 3249 | HURRICANE KATRINA EVACUATION | EM | Hurricane | 2005-09-13 |
| 1526 | SEVERE STORMS AND FLOODING | DR | Severe Storm | 2004-06-18 |
| 3163 | SNOW | EM | Snowstorm | 2001-01-24 |
| 1238 | SEVERE STORMS AND FLOODING | DR | Severe Storm | 1998-08-12 |
| 994 | SEVERE STORMS, TORNADOES & FLOODING | DR | Severe Storm | 1993-07-02 |
| 874 | SEVERE STORMS, TORNADOES & FLOODING | DR | Severe Storm | 1990-07-13 |
| 559 | SEVERE STORMS, FLOODING, HAIL & TORNADOES | DR | Severe Storm | 1978-07-07 |
| 3014 | DROUGHT | EM | Drought | 1976-06-17 |
| 496 | SEVERE STORMS, ICING, WIND & FLOODING | DR | Flood | 1976-03-23 |
| 376 | SEVERE STORMS & FLOODING | DR | Flood | 1973-04-27 |
Storm Events in Wisconsin
Statewide NOAA context only. PlainHazard does not currently attribute these state totals to Rock County.
| Storm Type | Events | Fatalities | Injuries | Property Damage |
|---|---|---|---|---|
| Thunderstorm Wind | 3,504 | 5 | 23 | $45.0M |
| Hail | 2,620 | 0 | 0 | $57.8M |
| Winter Weather | 1,939 | 43 | 152 | $2.1M |
| Winter Storm | 1,338 | 15 | 86 | $2.3M |
| Flood | 740 | 12 | 4 | $115.6M |
Source: NOAA Storm Events Database State-level aggregated data, 2015-2025
NFIP Flood Insurance Claims
Total Claims
304
Total Paid
$4.4M
Avg Per Claim
$14.5K
Source: FEMA National Flood Insurance Program (NFIP) OpenFEMA Claims Data
FEMA National Risk Index
Overall Risk
Relatively Moderate
Score: 86.4/100
Expected Annual Loss
Relatively Moderate
$73.3M/year
Social Vulnerability
Very Low
Community Resilience
Very High
Hazard Risk Breakdown
Hail Relatively High
Tornado Relatively High
Cold Wave Relatively High
Riverine Flooding Relatively Moderate
Strong Wind Relatively High
Lightning Relatively High
Heat Wave Relatively Moderate
Winter Weather Relatively Moderate
Landslide Very Low
Earthquake Very Low
Ice Storm Relatively Low
Drought Relatively Low
Wildfire Very Low
Hurricane 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: Hail
Hail is among the most expensive hazards in the model relative to how little it threatens life. It concentrates on roofs, vehicles and crops, and a single severe storm can generate an insurance loss across a metropolitan area without a single injury.
For Rock County the two measures on this page point the same way: Hail is the county's highest-rated modeled hazard (Relatively High), and Severe Storm declarations also lead its federal record. Where the model and the declaration history agree, the reading is comparatively straightforward, the hazard is both expected and repeatedly realised.
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
Rock County's closest FEMA peer: Plumas County, CA
Comparisons use published FEMA declaration fields plus the National Risk Index composite for Rock County. Record similarity, not a safety rating.
Similar modeled NRI score
Rock County: NRI composite 86.4 (Relatively Moderate).
Similar Major-disaster share
Rock County: 11 of 16 of its declarations are Major.
Closest declaration profiles
Rock County shows 16 FEMA declarations, led by Severe Storm.
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 Rock County - capture-dated entries only.
Compare beyond this state
Nationwide peers by NRI score & FEMA declaration volume
Two PlainHazard-derived comparison paths for Rock 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: 86.4 (Relatively Moderate).
Similar declaration volume
Nearest out-of-state counties by FEMA declaration count. This county: 16. NRI peers are excluded so the two link sets stay distinct.
Further reading for this county
Understanding disaster data
Rock County's NFIP claims file (304 claims) and FEMA declaration history measure different federal records - this guide separates them from modeled NRI risk.
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 Rock County?
The most common disaster type in Rock County is Severe Storm, with 7 declarations. Other disaster types include Flood (3), Biological (2), Snowstorm (2).
How does Rock County's FEMA declaration record compare with the Wisconsin average?
FEMA lists 16 declaration records for Rock County. That is 30% above the Wisconsin county mean of 12.3. Its count is also 23% below 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 Rock County received?
Rock County has received 11 major disaster declarations, representing 69% of all 16 disaster declarations.
How many flood insurance claims has Rock County filed?
Rock County has 304 National Flood Insurance Program (NFIP) claims totaling $4.4M in payments, with an average of $14.5K per claim.
Does FEMA's top risk-rated hazard match the highest Expected Annual Loss in Rock County?
No. In Rock County, Hail has the highest National Risk Index rating (Relatively High), while Riverine Flooding leads Expected Annual Loss at about $37.9M. FEMA's risk score and dollar-loss model use different inputs, so the leaders often differ.
What was the worst year for disasters in Rock County?
The most active year for disaster declarations in Rock County was 1976, with 2 declarations. The county has FEMA disaster data spanning 1973 to 2026.
What is the FEMA National Risk Index score for Rock County?
According to the FEMA National Risk Index, Rock County, Wisconsin has an overall risk score of 86.4 out of 100 (Relatively Moderate). The county's social vulnerability rating is Very Low and community resilience is Very High. The Expected Annual Loss (EAL) score is Relatively Moderate, representing $73.3M in annualized losses.
Which natural hazard poses the greatest risk to Rock County?
The top hazard flagged by FEMA's NRI for Rock County as of the latest release is Hail (risk rating: Relatively High). Other significant hazards include Tornado (Relatively High) and Cold Wave (Relatively High). FEMA's modeled event frequency puts hail here at an average of 4.3 times per year, drawn from 165 historical events on record. FEMA derives these ratings from historical event frequency, the assets exposed, and the community's vulnerability profile.
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 Rock County · vintage 2026-08-25 · Methodology · Wisconsin profile · Verify with FEMA OpenFEMA · Verify with NOAA Storm Events