Bonneville County Disaster Risk
Bonneville County, Idaho
FEMA Risk Rating
Relatively Moderate
National Percentile
82th
of 3,144 counties
State Rank
#2
of 44 (1 = highest risk)
Flood Risk
79th
percentile
Hazard Risk Breakdown
Flood
River, coastal, and surface flooding risk
Relatively Low
Higher than 79% of US counties
Wildfire
Wildland and wildland-urban interface fire risk
Moderate
Higher than 90% of US counties
Tornado
Tornado and severe thunderstorm risk
Very Low
Higher than 16% of US counties
Earthquake
Seismic activity and ground shaking risk
Moderate
Higher than 94% of US counties
Risk Overview
About Natural Disaster Risk in Bonneville County, Idaho
Bonneville ranks moderately risky nationally
Bonneville County scores 82.41, placing it in the relatively moderate risk category compared to national averages. This score reflects particularly high wildfire and earthquake exposure, with significant flood risk as well.
Idaho's second-highest composite risk
At 82.41, Bonneville is among Idaho's highest-risk counties, more than double the state average of 38.51. The county's proximity to the Teton Range and its geologic setting create outsized earthquake hazards.
Significantly riskier than surrounding areas
Bonneville's 82.41 score far exceeds Butte County's 4.42 and Caribou County's 7.22, reflecting its exposure to major earthquake faults and active fire zones. Madison and Teton counties face similar seismic and wildfire pressures.
Earthquakes and wildfires dominate exposure
Earthquake risk scores 94.18—the highest in the state—while wildfire risk reaches 90.33, making these the defining hazards for Bonneville residents. Flood risk of 78.59 adds a third significant concern, particularly in river-adjacent areas.
Earthquake and wildfire insurance essential
Bonneville's extreme earthquake score of 94.18 makes earthquake coverage critical; many insurers offer it as an add-on to homeowners policies. Wildfire and flood coverage are equally urgent given your county's 90.33 wildfire and 78.59 flood scores.
Source: FEMA National Risk Index · Narrative reviewed by Evan Brooks, Data Editor
Preparedness Guide
What to Prepare for in Bonneville County
Top Hazards by Exposure
Source: FEMA National Risk Index v1.19.0 · Percentiles are national (3,144 counties)
Risk Advisory: Bonneville County
Risk Verdict
FEMA's National Risk Index rates Bonneville County at the 82th percentile nationally — above average and worth proactive preparation. Residents should prioritize a formal household emergency plan, including evacuation routes, insurance review, and a well-stocked emergency kit.
Hazard Breakdown
Earthquake risk is Bonneville County's dominant natural hazard, ranked at the 94th percentile nationally under FEMA's National Risk Index. Wildfire ranks second at the 90th percentile nationally. Additional tracked hazards include flood (79th percentile), tornado (16th percentile).
Preparedness Context
Earthquake exposure at the 94th percentile nationally puts Bonneville County in a zone where utilities — gas, water, electrical — are the most common post-quake hazard. Knowing how to shut off the main gas valve is an important household skill to develop before an event occurs. Wildfire at the 90th percentile nationally is a separate hazard dimension for Bonneville County that requires different protective strategies from earthquake preparedness. Bonneville County households benefit from keeping shoes and a flashlight near the bed — post-earthquake navigation through debris in the dark is a common cause of secondary injury. This low-cost step has outsized protective value.
Regional Context
Bonneville County is 43.9 composite risk points above the Idaho average, indicating that residents face greater natural hazard exposure than most of their in-state neighbors.
Is your household prepared for Bonneville County's hazards?
Review FEMA's county-specific preparedness checklists and emergency planning guides.
Frequently Asked Questions
What is the natural disaster risk in Bonneville County, ID?
What types of natural hazards affect Bonneville County?
How does Bonneville County risk compare to the Idaho average?
Is Bonneville County at risk for earthquake?
How is natural disaster risk measured?
Why is Bonneville County higher risk than average?
Data Source
Risk data sourced from the FEMA National Risk Index (NRI). Risk scores are relative rankings (0–100) across all US counties — not absolute risk measures. Higher scores indicate higher relative risk compared to other counties.
Disclaimer: This data is informational only. It is not financial, insurance, or legal advice. Always consult a qualified professional before making insurance or real estate decisions.