LaSalle County Disaster Risk

LaSalle County has a FEMA National Risk Index rating of Relatively Moderate, placing it in the 86th 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.

LaSalle County is evaluated for five major natural hazard types: flooding (88th percentile), tornado (84th percentile), earthquake (82th percentile), hurricane (30th percentile), wildfire (21th percentile). The highest-risk hazard is flooding at the 88th 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.

LaSalle County's composite risk percentile is 86th, compared to the Illinois state average of 55th percentile. The state's overall risk rating is Relatively Low. This means LaSalle County faces higher natural disaster risk than the typical county in Illinois.

Yes, LaSalle County's flooding risk is at the 88th percentile nationally. This places it in the top quartile for this hazard type.

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.

LaSalle County's composite risk score of 86th percentile is above the Illinois state average of 55th percentile. This elevated risk is driven by flooding exposure (88th percentile), along with tornado and earthquake risk. Geographic location, terrain, climate patterns, and proximity to flood zones or fault lines all influence a county's risk profile.