FEMA Records
20
Above median
South Dakota · FEMA + NOAA + National Risk Index
Tripp County, SD
20 FEMA disaster declarations (1976-2024), with a FEMA National Risk Index rating of Very Low. Most common hazard: Flood.
- 20
- FEMA declarations
- 17
- Major disasters
- 36
- NRI risk · Very Low
- Flood
- Top hazard
The verdict
Two federal records point in the busier direction for Tripp County. Its 20 FEMA declarations are 5% above the South Dakota county mean and exceed the count for 46% of the 3,266 counties in this registry. Separately, FEMA's National Risk Index places it safer than 36%, based on modeled expected annual loss, social vulnerability, and community resilience.
- Safer than 36%
- of U.S. counties for FEMA National Risk Index score
- Very Low
- FEMA National Risk Index rating
- 20
- FEMA declarations vs 21 national county avg
- 8
- flood declarations, the most common hazard here
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 46123 · Tripp County 20 declarations · rank 1713/3,266
DECL-HEAVY · MAJOR-HEAVY · RANK-LOWER · PHOTO-FINISH · NRI-LOW · ACT-HIGH · TYPE-LEAD · VS-ST-ABOVE
- DECL-HEAVY 20
- MAJOR-HEAVY 85%
- RANK-LOWER #1,713
- PHOTO-FINISH Monona
- NRI-LOW Very Low
- ACT-HIGH High
- TYPE-LEAD Flood
- VS-ST-ABOVE +5%
Nearest declaration peer: Monona, IA (0 declaration gap)
FEMA Disaster Declarations Summaries v2 filing stamps for this county register. Read with this county → · South Dakota state profile
Tripp County in the declaration-count neighbourhood
FEMA declaration records among Tripp County and nearest peers by total count
- Los Angeles · largest
Los Angeles · largest
88 declarations
- Cleveland · near 20
Cleveland · near
20 declarations
- Monona · near 20
Monona · near
20 declarations
- Tallapoosa · near 20
Tallapoosa · near
20 declarations
- Tripp · this county 20
Tripp · this county
20 declarations
- Ujelang · smallest 1
Ujelang · smallest
1 declarations
What this shows Tripp County carries 20 FEMA declaration records, ranked 1713 of 3,266 counties in this registry.
How Tripp County's FEMA declaration count compares nationally
Tripp County vs. all counties in this dataset
FEMA disaster declarations, all-time · Tripp County
20 46th percentile higher than 46% 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
Tripp County's FEMA Risk Index score
What does Tripp County's hazard record show?
FEMA National Risk Index
FEMA's data shows an elevated National Risk Index composite of 36.5/100 for this county (Very Low rating). Expected Annual Loss comes in at Very Low (roughly $8.3M in annualized losses). Social vulnerability (Very High) and community resilience (Relatively Moderate) both factor into how that raw exposure plays out on the ground. Among the 18 modeled hazards, Cold Wave carries the county's highest rating, a mid-range Relatively Moderate. FEMA's modeled frequency puts that hazard at an average of 5.5 times per year here, based on 104 historical events on record.
Reading the federal records together
No paid-claim row for this county appears in the NFIP county table used by PlainHazard. That absence is not evidence that flooding never occurred: the register observes claims under federal flood-insurance policies, not uninsured losses, emergency reports, or every flood outside the program. The FEMA declaration history below is therefore the available federal-action record on this page.
The declaration register points in the busier direction. Tripp County's 20 federal records stand 5% above the South Dakota county mean of 19.0. 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.
66 /100
Historical Activity Index
High historical activity
Tripp County, SD · 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
14/30
20 OpenFEMA declarations, full ingest window (1.0x national county average)
County Disaster Density High
13/25
20 declarations (1.1x state county average of 19)
Major Disaster Share Very High
21/25
17 of 20 declarations are major disasters (85%)
Hazard Diversity Very High
18/20
7 different disaster types declared in Tripp County
FEMA NRI 8-hazard radar - Tripp 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
85%
Mostly major
NRI risk score
36
Very Low
Source: FEMA National Risk Index Per-county per-hazard ratings, December 2025 release
How often does each hazard strike Tripp 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 |
|---|---|---|
| Cold Wave | Relatively Moderate | an average of 5.5 times per year |
| Winter Weather | Relatively Moderate | an average of 15 times per year |
| Wildfire | Relatively Low | roughly once every 1,213 years |
| Hail | Relatively Low | an average of 3.9 times per year |
| Ice Storm | Relatively Low | roughly once every 3 years |
| Drought | Relatively Low | 31 modeled event-days per year |
| Tornado | Relatively Low | roughly once every 2 years |
| Riverine Flooding | Relatively Low | roughly once every 1 years |
| Strong Wind | Relatively Low | an average of 2.4 times per year |
| Heat Wave | Very Low | 4.1 modeled event-days per year |
| Earthquake | Very Low | roughly once every 2,469 years |
| Lightning | Very Low | an average of 37 times per year |
| Landslide | Very Low | roughly once every 3 years |
Source: FEMA National Risk Index Modeled annualized frequency; drought and heat wave use event-days/year, December 2025 release
Disaster Types
Flood 8
Severe Storm 6
Biological 2
Winter Storm 1
Coastal Storm 1
Snowstorm 1
Drought 1
What Flood declarations mean here
Flood is the most frequent declaration type on Tripp County's record, 40% of its declarations. Federal flood declarations cover two mechanisms that behave very differently: riverine flooding, which builds over days as a watershed drains and is usually forecast well in advance, and flash flooding, which can arrive in under an hour from rainfall that fell somewhere upstream.
Flood is also the one hazard class where a second federal dataset exists for the same events. The National Flood Insurance Program records what was actually paid on insured losses, so it measures a narrower thing than the declaration count: uninsured damage, and flooding outside mapped special flood hazard areas, never enters it. Reading the two together is more informative than either alone.
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 - 17 85.0%
of all 20 declarations
Emergency - 3 15.0%
of all 20 declarations
FEMA Declarations Timeline
| Year | Declarations | |
|---|---|---|
| 2024 | 1 | |
| 2023 | 1 | |
| 2020 | 3 | |
| 2019 | 2 | |
| 2010 | 2 | |
| 2008 | 1 | |
| 2007 | 1 | |
| 2005 | 1 | |
| 2004 | 1 | |
| 2001 | 1 | |
| 1997 | 2 | |
| 1996 | 1 | |
| 1995 | 1 | |
| 1986 | 1 | |
| 1976 | 1 | |
Disaster Declarations
How the 20 FEMA declarations break into federal action codes (DR / EM / FM). Same DISTINCT grain as the table below.
Download these 20 declarations as CSV . FEMA source data is public domain; our derived presentation is CC0.
| DR# | Title | Type | Incident | Date |
|---|---|---|---|---|
| 4807 | SEVERE STORMS, STRAIGHT-LINE WINDS, AND FLOODING | DR | Flood | 2024-08-15 |
| 4689 | SEVERE WINTER STORMS AND SNOWSTORM | DR | Winter Storm | 2023-02-27 |
| 4527 | COVID-19 PANDEMIC | DR | Biological | 2020-04-05 |
| 3475 | COVID-19 | EM | Biological | 2020-03-13 |
| 4467 | SEVERE STORMS, TORNADOES, AND FLOODING | DR | Severe Storm | 2019-10-07 |
| 4463 | SEVERE STORMS AND FLOODING | DR | Flood | 2019-09-23 |
| 4440 | SEVERE WINTER STORM, SNOWSTORM, AND FLOODING | DR | Flood | 2019-06-07 |
| 1915 | FLOODING | DR | Flood | 2010-05-13 |
| 1886 | SEVERE WINTER STORM AND SNOWSTORM | DR | Severe Storm | 2010-03-09 |
| 1774 | SEVERE STORMS AND FLOODING | DR | Severe Storm | 2008-07-09 |
| 1702 | SEVERE STORMS, TORNADOES, AND FLOODING | DR | Severe Storm | 2007-05-22 |
| 3234 | HURRICANE KATRINA EVACUATION | EM | Coastal Storm | 2005-09-10 |
| 1531 | SEVERE STORMS AND FLOODING | DR | Severe Storm | 2004-07-20 |
| 1375 | SEVERE WINTER STORMS, FLOODING, AND ICE JAMS | DR | Flood | 2001-05-17 |
| 1173 | SEVERE FLOODING, SEVER WINTER STORMS,HEAVY RAINS HIGH WINDS | DR | Flood | 1997-04-07 |
| 1156 | SEVERE WINTER STORMS AND BLIZZARD CONDITIONS | DR | Severe Storm | 1997-01-10 |
| 1075 | SEVERE WINTER STORM | DR | Snowstorm | 1996-01-05 |
| 1052 | FLOODING | DR | Flood | 1995-05-26 |
| 764 | SEVERE STORMS & FLOODING | DR | Flood | 1986-05-03 |
| 3015 | DROUGHT | EM | Drought | 1976-06-17 |
Storm Events in South Dakota
Statewide NOAA context only. PlainHazard does not currently attribute these state totals to Tripp County.
| Storm Type | Events | Fatalities | Injuries | Property Damage |
|---|---|---|---|---|
| Thunderstorm Wind | 5,388 | 7 | 21 | $10.7M |
| Hail | 4,801 | 0 | 3 | $4.5M |
| High Wind | 2,277 | 0 | 1 | $35.0K |
| Winter Weather | 2,125 | 20 | 50 | $133.0K |
| Flood | 1,523 | 5 | 0 | $196.2M |
Source: NOAA Storm Events Database State-level aggregated data, 2015-2025
FEMA National Risk Index
Overall Risk
Very Low
Score: 36.5/100
Expected Annual Loss
Very Low
$8.3M/year
Social Vulnerability
Very High
Community Resilience
Relatively Moderate
Hazard Risk Breakdown
Cold Wave Relatively Moderate
Winter Weather Relatively Moderate
Wildfire Relatively Low
Hail Relatively Low
Ice Storm Relatively Low
Drought Relatively Low
Tornado Relatively Low
Riverine Flooding Relatively Low
Strong Wind Relatively Low
Heat Wave Very Low
Earthquake Very Low
Lightning Very Low
Landslide 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: Cold Wave
Cold Wave measures exposure to extreme cold rather than to snow. Its harm is concentrated in health effects, burst infrastructure and energy demand spikes, and it falls hardest where the building stock and the grid were not built with sustained cold in mind.
Worth noting for Tripp County: the model and the federal record do NOT point at the same hazard. Cold Wave carries the highest modeled rating (Relatively Moderate), while the county's declaration history is led by Flood. 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
Tripp County's closest FEMA peer: Kossuth County, IA
Comparisons use published FEMA declaration fields plus the National Risk Index composite for Tripp County. Record similarity, not a safety rating.
Closest declaration profiles
Tripp County shows 20 FEMA declarations, led by Flood.
Similar Major-disaster share
Tripp County: 17 of 20 of its declarations are Major.
Similar modeled NRI score
Tripp County: NRI composite 36.5 (Very 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 Tripp County - capture-dated entries only.
Compare beyond this state
Nationwide peers by NRI score & FEMA declaration volume
Two PlainHazard-derived comparison paths for Tripp 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: 36.5 (Very Low).
Similar declaration volume
Nearest out-of-state counties by FEMA declaration count. This county: 20. NRI peers are excluded so the two link sets stay distinct.
Further reading for this county
Most disaster-prone counties
With 20 FEMA declarations, Tripp 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 Tripp County?
The most common disaster type in Tripp County is Flood, with 8 declarations. Other disaster types include Severe Storm (6), Biological (2), Winter Storm (1).
How does Tripp County's FEMA declaration record compare with the South Dakota average?
FEMA lists 20 declaration records for Tripp County. That is 5% above the South Dakota county mean of 19.0. Its count is also 3% 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 Tripp County received?
Tripp County has received 17 major disaster declarations, representing 85% of all 20 disaster declarations.
What was the worst year for disasters in Tripp County?
The most active year for disaster declarations in Tripp County was 2020, with 3 declarations. The county has FEMA disaster data spanning 1976 to 2024.
What is the FEMA National Risk Index score for Tripp County?
According to the FEMA National Risk Index, Tripp County, South Dakota has an overall risk score of 36.5 out of 100 (Very Low). On social vulnerability the county rates Very High; on community resilience, Relatively Moderate. The Expected Annual Loss (EAL) score is Very Low, representing $8.3M in annualized losses.
Which natural hazard poses the greatest risk to Tripp County?
Based on FEMA NRI data, the highest-risk natural hazard in Tripp County as of the latest release is Cold Wave (risk rating: Relatively Moderate). Other significant hazards include Winter Weather (Relatively Moderate) and Wildfire (Relatively Low). FEMA's modeled event frequency puts cold wave here at an average of 5.5 times per year, drawn from 104 historical events on record. These scores are based on FEMA's analysis of historical event frequency, 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.
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 Tripp County · vintage 2026-08-25 · Methodology · South Dakota profile · Verify with FEMA OpenFEMA · Verify with NOAA Storm Events