Lee County, Illinois: Natural Disaster Risk and History
Lee County, Illinois has a Relatively Low natural-hazard risk rating in FEMA's National Risk Index (v1.20, December 2025): a score of 54.4 out of 100, higher than about 54% of US counties, with strong winds, drought and hail scoring highest of its 18 hazards and $21 million a year in expected losses.
OpenFEMA lists 8 federal disaster declarations that included Lee County since 1973, not counting 2 for COVID-19; the latest is DR-4461-IL (Severe Storms and Flooding, declared 19 September 2019). NOAA's Storm Prediction Center recorded 40 tornadoes touching Lee County from 1950 to 2025.
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Population 34,125 Buildings worth $11 billion Area 736 sq mi Risk rank in Illinois 52 of 102 FIPS 17103
All 18 hazards, highest risk first
FEMA National Risk Index| Hazard | Risk rating | Score | Expected loss a year | How often | Events in record |
|---|---|---|---|---|---|
| Strong wind | Relatively High | 84.6 | $1.8 million | about 6.1 a year | 233 |
| Drought | Relatively Moderate | 79.6 | $1.0 million | about 11 a year | 301 |
| Hail | Relatively Low | 72.4 | $712,093 | about 4.1 a year | 156 |
| Tornado | Relatively Moderate | 69.8 | $2.9 million | about once every 1.5 years | 30 |
| Cold wave | Relatively Moderate | 68.7 | $2.3 million | about 5.8 a year | 110 |
| Inland flooding | Relatively Low | 62.5 | $11 million | about once every 1.1 years | 26 |
| Earthquake | Very Low | 49.6 | $307,635 | about once every 763 years | — |
| Ice storm | Relatively Low | 42.2 | $67,775 | about once every 1.8 years | 38 |
| Landslide | Very Low | 37.5 | $635 | about once every 9.3 years | — |
| Heat wave | Very Low | 31.9 | $172,367 | about 3.7 a year | 60 |
| Winter weather | Relatively Low | 29.6 | $33,283 | about 14 a year | 274 |
| Lightning | Relatively Low | 28.8 | $118,941 | about 42 a year | 120,648 strikes |
| Hurricane | Very Low | 15.7 | $4,621 | about once every 123 years | 0 |
| Wildfire | Very Low | 9.4 | $3,427 | rarer than once in 1,000 years | — |
| Avalanche | Not Applicable | — | — | — | — |
| Coastal flooding | Not Applicable | — | — | — | — |
| Tsunami | Not Applicable | — | — | — | — |
| Volcanic activity | Not Applicable | — | — | — | — |
Score: FEMA's percentile among US counties that face the hazard (higher = more risk). Expected loss: FEMA's modelled average yearly loss to buildings, people (as a statistical value) and crops. How often: FEMA's annualised frequency of the hazard in the county; for some hazards it counts event-days, so it is a rough guide, not a forecast. "Not Applicable" means FEMA does not model that hazard here.
Federal disaster declarations 8
Most common: Flood 4, Snowstorm 3, Hurricane 1.
| Decade | Declarations | Incident types |
|---|---|---|
| 1970s | 3 | Flood ×2, Snowstorm |
| 1980s | 1 | Flood |
| 2000s | 2 | Snowstorm, Hurricane |
| 2010s | 2 | Flood, Snowstorm |
The last 8
Widest declarations that included Lee County
- Hurricane Katrina Evacuation (2005, EM-3230-IL): 102 Illinois counties designated.
- Severe Winter Storm and Snowstorm (2011, DR-1960-IL): 65 Illinois counties designated.
- Severe Storms & Flooding (1973, DR-373-IL): 52 Illinois counties designated.
Named storms in its declarations: Hurricane Katrina (2005).
Not counted above: 2 COVID-19 ("Biological") declarations — in 2020 every US county was included. Illinois also had 2 statewide declarations with no county list.
Tornado record since 1950 40
| Tornadoes touching the county | 40 |
|---|---|
| Strongest-rated | (E)F4 ×1 |
| Peak month | June (11) |
| Deadliest | 9 Apr 2015, EF4, 30.1 mi path, 2 killed, 11 injured |
| Longest path | 15 Aug 1958, F2, 74.5 mi path |
| Most recent | 27 Feb 2024, EF0, 0.1 mi path |
| Deaths / injuries on those paths | 3 / 28 |
| Rating | (E)F0 | (E)F1 | (E)F2 | (E)F3 | (E)F4 | (E)F5 | Unrated |
|---|---|---|---|---|---|---|---|
| Count | 16 | 11 | 9 | 0 | 1 | 0 | 3 |
| Decade | 1950s | 1960s | 1970s | 1980s | 1990s | 2000s | 2010s | 2020s |
|---|---|---|---|---|---|---|---|---|
| Count | 3 | 4 | 6 | 4 | 5 | 2 | 9 | 7 |
Deaths and injuries are for each tornado's whole path, which can run beyond this county. F-scale ratings before February 2007, Enhanced Fujita (EF) after.
How Lee County compares with its 5 nearest counties
| County | Distance | Overall risk | Score | Top hazard |
|---|---|---|---|---|
| Lee County (this page) | — | Relatively Low | 54.4 | Strong wind |
| Ogle County | 33 km | Relatively Low | 71.1 | Hail |
| Bureau County | 42 km | Relatively Low | 62.3 | Drought |
| DeKalb County | 47 km | Relatively Low | 80.8 | Cold wave |
| Whiteside County | 51 km | Relatively Low | 65.8 | Drought |
| LaSalle County | 56 km | Relatively Moderate | 86.1 | Cold wave |
Nearest by distance between county centres. Every county in Illinois, ranked.
Vulnerability and resilience
| Social vulnerability | Relatively Low 23.2 |
|---|---|
| Community resilience | Very High 82.7 |
| Community risk factor | 0.91 |
| Expected annual loss, all hazards | $21 million |
FEMA scales expected losses up where social vulnerability is high (people who may find it harder to prepare, evacuate or recover) and down where community resilience is high. A factor above 1 raises the risk score. For social vulnerability a high rating is worse; for resilience a high rating is better.
Prepare for Lee County's main hazards
- Right now: National Weather Service alerts for Illinois · all official warnings on Global Incident Tracker.
- Strong wind: Power outages now
- Drought: Drought monitor for Illinois
- Hail: Weather alerts for Illinois
- Your property's flood zone: FEMA Flood Map Service Center ↗ — this page cannot tell you that.
- Official preparedness guidance: Ready.gov ↗ and your county emergency management office.
What this page shows, and what it misses
FEMA's National Risk Index rates a whole county against every other US county; it is a planning-level estimate for nationwide comparison, not a flood-zone map and not a substitute for a local risk assessment or the risk to one home. Declarations are presidential disaster, emergency and fire management declarations that named this county; state declarations and SBA or USDA designations are not included. Tornadoes are counted when the county is one of up to four listed on the track; 670 tornadoes that crossed a state line carry no county list in NOAA's file and are left out.
Federal Emergency Management Agency (FEMA), National Risk Index Dataset: National Risk Index Counties - v1.20.0 (December 2025). Retrieved from https://services.arcgis.com/XG15cJAlne2vxtgt/ArcGIS/rest/services/National_Risk_Index_Counties/FeatureServer/0/query on November 2, 2026, 1:20 PM EST. This product uses the Federal Emergency Management Agency’s National Risk Index dataset API or downloadable datasets but is not endorsed by FEMA. The Federal Government or FEMA cannot vouch for the data or analyses derived from these data after the data have been retrieved from the Agency's website(s).
Federal Emergency Management Agency (FEMA), OpenFEMA Dataset: Disaster Declarations Summaries - v2, retrieved from https://www.fema.gov/api/open/v2/DisasterDeclarationsSummaries on November 2, 2026, 1:21 PM EST. This product uses the Federal Emergency Management Agency's OpenFEMA API, but is not endorsed by FEMA. The Federal Government or FEMA cannot vouch for the data or analyses derived from these data after the data have been retrieved from the Agency's website(s).
Tornado records: NOAA/NWS Storm Prediction Center, Severe Weather Database, tornadoes 1950–2025 (https://www.spc.noaa.gov/wcm/data/1950-2025_actual_tornadoes.csv, downloaded 2 November 2026). Public domain; not endorsed by NOAA. Compiled by Global Incident Tracker.
Questions about Lee County
What natural disasters is Lee County, Illinois most at risk from?
Lee County, Illinois has a Relatively Low natural-hazard risk rating in FEMA's National Risk Index (v1.20, December 2025): a score of 54.4 out of 100, higher than about 54% of US counties, with strong winds, drought and hail scoring highest of its 18 hazards and $21 million a year in expected losses.
How many federal disaster declarations has Lee County had?
OpenFEMA lists 8 federal disaster declarations that included Lee County since 1973, not counting 2 for COVID-19; the latest is DR-4461-IL (Severe Storms and Flooding, declared 19 September 2019). Another 2 Illinois declarations were made statewide without a county list.
How many tornadoes have hit Lee County?
NOAA's Storm Prediction Center recorded 40 tornadoes touching Lee County from 1950 to 2025. The deadliest: 9 Apr 2015, EF4, 30.1 mi path, 2 killed, 11 injured (deaths and injuries are for the whole path).
Is the National Risk Index a flood zone map?
No. The National Risk Index is a planning-level estimate for a whole county, built for nationwide comparison. It does not tell you the flood zone or the risk of a single property: for that, look up the address on FEMA's Flood Map Service Center (msc.fema.gov) and ask your local floodplain manager.