Twin Falls County Disaster Risk

Twin Falls County has a FEMA National Risk Index rating of Relatively Low, placing it in the 47th percentile nationally out of 3,144 counties. This composite score reflects the county's overall exposure to natural hazards including floods, wildfires, tornadoes, earthquakes, and hurricanes, weighted by expected annual loss and social vulnerability.

Twin Falls County is evaluated for five major natural hazard types: wildfire (94th percentile), earthquake (74th percentile), flooding (51th percentile), tornado (13th percentile). The highest-risk hazard is wildfire at the 94th percentile nationally. These scores are derived from FEMA's National Risk Index, which analyzes expected annual loss, social vulnerability, and community resilience for each hazard type.

Twin Falls County's composite risk percentile is 47th, compared to the Idaho state average of 39th percentile. The state's overall risk rating is Very Low. This means Twin Falls County faces higher natural disaster risk than the typical county in Idaho.

Yes, Twin Falls County's wildfire risk is at the 94th percentile nationally. This places it in the top quartile for this hazard type. For flooding specifically, Twin Falls County is at the 51th percentile.

FEMA's National Risk Index (NRI) calculates risk scores for 18 natural hazard types across all U.S. counties and census tracts. The composite score combines Expected Annual Loss (estimated dollar losses from each hazard), Social Vulnerability (demographic factors affecting disaster impact), and Community Resilience (ability to recover). Percentile scores rank each county against all 3,144 U.S. counties, and risk ratings range from Very Low to Very High.

Twin Falls County's composite risk score of 47th percentile is above the Idaho state average of 39th percentile. This elevated risk is driven by wildfire exposure (94th percentile), along with earthquake and flooding risk. Geographic location, terrain, climate patterns, and proximity to flood zones or fault lines all influence a county's risk profile.