Minnehaha County, SD
FEMA National Risk Index scores, disaster declarations & hazard data
Minnehaha County has experienced 17 federally declared disasters since 1969, most recently Severe Storms, Straight-Line Winds, And Flooding in 2024. Its overall natural hazard risk is rated Relatively Moderate — near the middle compared to other US counties.
Minnehaha County's highest-rated hazards are ice storm, tornado, and winter weather, with its top risk rated "Very High" by FEMA's National Risk Index. Recorded storm events have decreased 30% over the past five years compared to the prior five-year period.
Past disasters & FEMA designations
A federal disaster declaration officially designates a county for FEMA disaster assistance. Minnehaha County has been designated in 17 declarations since 1969, covering 5 disaster types including severe storm (8), flood (5), biological (2).
| Year | Type | Event name |
|---|---|---|
| 2024 | Flood | Severe Storms, Straight-Line Winds, And Flooding |
| 2022 | Severe Storm | Severe Storm, Straight-Line Winds, Tornadoes, And Flooding |
| 2020 | Severe Storm | Severe Storms, Tornadoes, And Flooding |
| 2020 | Biological | Covid-19 Pandemic |
| 2020 | Biological | Covid-19 |
| 2019 | Flood | Severe Winter Storm, Snowstorm, And Flooding |
| 2014 | Flood | Severe Storms, Tornadoes, And Flooding |
| 2013 | Severe Storm | Severe Winter Storm And Snowstorm |
| 2010 | Severe Storm | Severe Storms And Flooding |
| 2005 | Coastal Storm | Hurricane Katrina Evacuation |
Showing the 10 most recent of 17 total declarations since 1969.
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 | Relatively Low | 71.3 | 0 | 0 | — |
| Inland Flooding | Relatively Moderate | 85.5 | 159 | 0 | $7.8M |
| Coastal Flooding | Not Applicable | — | 0 | 0 | — |
| Earthquake | Very Low | 37.2 | — | — | — |
| Heat Wave | Relatively Moderate | 87.2 | 19 | 0 | — |
| Tornado | Relatively High | 98.4 | 6 | 0 | $3.0M |
| Hurricane | Not Applicable | — | 0 | 0 | — |
| Hail | Relatively Moderate | 92.5 | 102 | 0 | $500K |
| Strong Wind | Relatively High | 91.1 | 0 | 0 | — |
| Winter Weather | Relatively High | 96.3 | 0 | 0 | — |
| Ice Storm | Very High | 99.1 | — | — | — |
| Cold Wave | Relatively High | 96 | — | — | — |
| Lightning | Relatively Low | 55.1 | 0 | 0 | — |
| Drought | Relatively Moderate | 73.4 | 0 | 0 | — |
| Landslide | Very Low | 52.2 | 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
Minnehaha 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 | 18th | Very low |
| Household characteristics | 46th | Low |
| Racial & ethnic minority status | 53rd | Moderate |
| Housing type & transportation | 66th | Moderate |
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 | 25th | Relatively Low |
| Risk to homes | 27th | Relatively Low |
| Buildings in direct exposure zone | 25.2% | — |
NOAA tracked 286 weather events in this county over 2016–2025: 168 in 2016–20 vs 118 in 2021–25 (-30% — 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 Minnehaha County?
According to the FEMA National Risk Index, the highest-risk hazards in Minnehaha County, South Dakota are ice storm, tornado, and winter weather. The county's overall natural hazard risk is rated Relatively Moderate — near the middle compared to other US counties.
Has Minnehaha County received federal disaster declarations?
Yes. Minnehaha County has received 17 federal disaster declarations since 1969, including declarations in 2024. The most common disaster type on record is severe storm (8 declarations).
Has Minnehaha County had any FEMA disaster declarations in 2024, 2025, or 2026?
Yes. Recent federal disaster declarations for Minnehaha County include Severe Storms, Straight-Line Winds, And Flooding (2024). See the declarations table above for the full history since 1969.
How does Minnehaha County's natural hazard risk compare to nearby counties?
Among neighboring counties, Lincoln County, SD has the highest overall natural hazard risk (Relatively Low) and Rock County, MN has the lowest (Very Low). Minnehaha County is rated Relatively Moderate overall.
How is Minnehaha County's composite disaster risk index calculated?
Minnehaha 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. Minnehaha County's composite score of 90 means its overall natural hazard risk is higher than 90% of US counties.