Natural disaster risk in Bon Homme County, South Dakota
South Dakota · population 6,996 · FIPS 46009
Overall: very low risk
Bon Homme County has a composite risk score of 10.8 out of 100 — higher than 10% of US counties. It ranks 43 of 66 in South Dakota (1 = highest risk). Its highest-rated hazards are drought, ice storm, winter weather.
Drought now: Yes: D1 Moderate Drought, 53 weeks
Yes. On the U.S. Drought Monitor map valid 13 October 2026, 33.49% of Bon Homme County is in D1 Moderate Drought. Some of it has been at D1 or worse for 53 weeks in a row.
Drought in Bon Homme County: the last 52 weeks · droughtmonitor.unl.edu
The U.S. Drought Monitor is jointly produced by the National Drought Mitigation Center at the University of Nebraska-Lincoln, the United States Department of Agriculture, the National Oceanic and Atmospheric Administration and the National Aeronautics and Space Administration. Map courtesy of NDMC.
Risk, loss, vulnerability and resilience
| Measure | Rating and score |
|---|---|
| Overall risk Expected annual loss, adjusted for social vulnerability and community resilience. |
Very low 10.8 |
| Expected annual loss About $7.2 million a year, on average, across all 18 hazards. |
Very low 23.1 |
| Social vulnerability Higher means people may find it harder to prepare and recover. |
Very low 10.6 |
| Community resilience Higher means a stronger ability to prepare, adapt and recover. |
Relatively moderate 59.3 |
Risk by hazard
FEMA's risk rating for each of 18 natural hazards in Bon Homme County, highest first. "Not applicable" means the hazard is not modelled here.
| Hazard | Risk rating and score |
|---|---|
| Drought | Relatively moderate 85 |
| Ice storm | Relatively moderate 62 |
| Winter weather | Relatively low 59 |
| Hail | Relatively low 52 |
| Cold wave | Relatively low 50 |
| Tornado | Relatively low 33 |
| Strong wind | Relatively low 24 |
| Wildfire | Very low 53 |
| Landslide | Very low 35 |
| Heat wave | Very low 23 |
| Earthquake | Very low 13 |
| Lightning | Very low 13 |
| Inland (riverine) flooding | Very low 8 |
| Avalanche | Not applicable |
| Coastal flooding | Not applicable |
| Hurricane | Not applicable |
| Tsunami | Not applicable |
| Volcanic activity | Not applicable |
FEMA disaster declarations for Bon Homme County
Federal declarations that designated Bon Homme County, since 1 Jan 2024 (the period this site keeps from OpenFEMA). Older declarations are in FEMA's own dataset.
Yes. Bon Homme County has been named in 1 FEMA declaration since 1 Jan 2024. The latest is DR-4807-SD (Severe Storms, Straight-Line Winds, and Flooding), declared 15 Aug 2024.
| Declaration | Kind | Incident | Declared | Individual assistance here |
|---|---|---|---|---|
| DR-4807-SD | Major disaster | Severe Storms, Straight-Line Winds, and Flooding | 15 Aug 2024 | No |
All FEMA declarations in South Dakota, with estimated apply-by dates · Open FEMA deadlines
This product uses the Federal Emergency Management Agency's OpenFEMA API, but is not endorsed by FEMA. The Federal Government or FEMA cannot vouch for the data or analyses derived from these data after the data have been retrieved from the Agency's website(s). Dataset: Disaster Declarations Summaries - v2.
How to read these ratings
- Ratings run in five steps: very low, relatively low, relatively moderate, relatively high and very high. They compare a county with every other US county; they are not a measure of danger on their own.
- Scores run from 0 to 100 and are national percentiles. The bar shows the score: a score of 80 means a higher value than 80% of US counties.
- Overall risk combines the expected annual loss with social vulnerability and community resilience.
- Expected annual loss is the average yearly loss to buildings, people and agriculture the model expects from all 18 hazards.
- Social vulnerability describes how hard it may be for people to prepare for and recover from a disaster. Higher is worse.
- Community resilience describes a community's ability to prepare, adapt and recover. Higher is better.
- "Not applicable" means FEMA does not model that hazard there (for example, hurricanes far inland).
About this data
Source: FEMA National Risk Index, version 1.20, released December 2025, published by the Federal Emergency Management Agency (US public domain). About the National Risk Index. The index is a model of relative risk built from historical hazard records, what is exposed and community factors. It is not a forecast, it does not describe any single property, and it is not insurance or financial advice. For decisions about a specific address, check FEMA's flood maps and your local emergency management office.
Questions
What is the natural disaster risk in Bon Homme County, South Dakota?
FEMA's National Risk Index rates the overall risk in Bon Homme County as very low, with a score of 10.8 out of 100 (higher than 10% of US counties). That is a comparison with other US counties, not a forecast.
What are the biggest natural hazards in Bon Homme County?
The hazards rated highest for Bon Homme County are drought (relatively moderate), ice storm (relatively moderate), winter weather (relatively low).
What is the flood risk in Bon Homme County?
FEMA rates inland (river and rain) flooding risk in Bon Homme County as very low. For a specific property, check the FEMA flood map and your local floodplain office.
Has Bon Homme County had a FEMA disaster declaration?
Yes. Bon Homme County has been named in 1 FEMA declaration since 1 Jan 2024. The latest is DR-4807-SD (Severe Storms, Straight-Line Winds, and Flooding), declared 15 Aug 2024.
Is Bon Homme County in a drought?
Yes. On the U.S. Drought Monitor map valid 13 October 2026, 33.49% of Bon Homme County is in D1 Moderate Drought. Some of it has been at D1 or worse for 53 weeks in a row.
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