Bonneville County, ID
FEMA National Risk Index scores, disaster declarations & hazard data
Bonneville County has experienced 7 federally declared disasters since 1965, most recently Covid-19 in 2020. Its overall natural hazard risk is rated Relatively Moderate — near the middle compared to other US counties.
Bonneville County's highest-rated hazards are earthquake, avalanche, and landslide, with its top risk rated "Relatively Moderate" by FEMA's National Risk Index. NOAA records 40 storm events in the county over the past decade.
Past disasters & FEMA designations
A federal disaster declaration officially designates a county for FEMA disaster assistance. Bonneville County has been designated in 7 declarations since 1965, covering 5 disaster types including biological (2), flood (2), fire (1).
| Year | Type | Event name |
|---|---|---|
| 2020 | Biological | Covid-19 Pandemic |
| 2020 | Biological | Covid-19 |
| 2016 | Fire | Henrys Creek Fire |
| 2005 | Hurricane | Hurricane Katrina |
| 1997 | Severe Storm | Severe Storms, Snowmelt, Land/Mud Slides, Flooding |
| 1976 | Flood | Dam Collapse, Flooding |
| 1965 | Flood | Heavy Rains & Flooding |
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 Moderate | 90.3 | 0 | 0 | — |
| Inland Flooding | Relatively Moderate | 78.6 | 15 | 0 | $1.2M |
| Coastal Flooding | Not Applicable | — | 0 | 0 | — |
| Earthquake | Relatively Moderate | 94.2 | 16 | — | — |
| Heat Wave | Relatively Moderate | 81.2 | 0 | 0 | — |
| Tornado | Very Low | 16.2 | 1 | 0 | $200 |
| Hurricane | Not Applicable | — | 0 | 0 | — |
| Hail | Relatively Moderate | 84.9 | 18 | 0 | $29.8M |
| Strong Wind | Relatively Low | 43.9 | 0 | 0 | — |
| Winter Weather | Relatively Moderate | 66.2 | 0 | 0 | — |
| Ice Storm | Very Low | 26.8 | — | — | — |
| Cold Wave | Relatively High | 93 | — | — | — |
| Lightning | Relatively High | 89.5 | 6 | 0 | $806K |
| Drought | Very Low | 19.4 | 0 | 0 | — |
| Landslide | Relatively Moderate | 94.2 | 0 | 0 | — |
| Avalanche | Relatively High | 94.2 | — | — | — |
| Tsunami | Not Applicable | — | — | — | — |
| Volcanic Activity | Very Low | 72.3 | — | — | — |
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
Bonneville County ranks in the 45th 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 | 45th | Low |
| Socioeconomic status | 41st | Low |
| Household characteristics | 59th | Moderate |
| Racial & ethnic minority status | 50th | Moderate |
| Housing type & transportation | 37th | Low |
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 | 86th | Very High |
| Risk to homes | 88th | Very High |
| Buildings in direct exposure zone | 26.4% | — |
NOAA tracked 40 weather events in this county over 2016–2025: 19 in 2016–20 vs 21 in 2021–25 (+11% — frequency increasing).
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 Bonneville County?
According to the FEMA National Risk Index, the highest-risk hazards in Bonneville County, Idaho are earthquake, avalanche, and landslide. The county's overall natural hazard risk is rated Relatively Moderate — near the middle compared to other US counties.
Has Bonneville County received federal disaster declarations?
Yes. Bonneville County has received 7 federal disaster declarations since 1965, including declarations in 2020. The most common disaster type on record is biological (2 declarations).
Has Bonneville County had any FEMA disaster declarations in 2024, 2025, or 2026?
No federal disaster declarations have been recorded for Bonneville County since the start of 2024. Its most recent declaration on record is Covid-19 in 2020.
How does Bonneville County's natural hazard risk compare to nearby counties?
Among neighboring counties, Bingham County, ID has the highest overall natural hazard risk (Relatively Low) and Caribou County, ID has the lowest (Very Low). Bonneville County is rated Relatively Moderate overall.
How is Bonneville County's composite disaster risk index calculated?
Bonneville 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. Bonneville County's composite score of 82 means its overall natural hazard risk is higher than 82% of US counties.