Calhoun County Disaster Risk

Calhoun County has a FEMA National Risk Index rating of Relatively Low, placing it in the 45th 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.

Calhoun County is evaluated for five major natural hazard types: tornado (74th percentile), flooding (21th percentile), hurricane (15th percentile), earthquake (15th percentile), wildfire (8th percentile). The highest-risk hazard is tornado at the 74th 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.

Calhoun County's composite risk percentile is 45th, compared to the Iowa state average of 40th percentile. The state's overall risk rating is Very Low. This means Calhoun County faces higher natural disaster risk than the typical county in Iowa.

Yes, Calhoun County's tornado risk is at the 74th percentile nationally. This is above the national median. For flooding specifically, Calhoun County is at the 21th 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.

Calhoun County's composite risk score of 45th percentile is above the Iowa state average of 40th percentile. This elevated risk is driven by tornado exposure (74th percentile). Geographic location, terrain, climate patterns, and proximity to flood zones or fault lines all influence a county's risk profile.