Lee County, IL Environment & Hazard Risk
Relatively Low natural hazard risk, led by strong wind. 471 storm events since 1996.
- Expected yearly loss
- $20.6M
- Relatively Low nationally
- Storm events since 1996
- 471
- Most often thunderstorm wind
- Flood insurance policies
- 93
- 0.6% of homes
- Hurricanes nearby
- 0
- Since 1851
Natural hazard risk
FEMA National Risk Index, December 2025
Overall risk
Relatively Low
Score 54.4 of 100
Social vulnerability
Relatively Low
Score 23.2 of 100
Community resilience
Very High
Score 82.7 of 100
Community resilience runs the other way: a higher rating means a community can recover faster.
Building value exposed: $11.1B · Agriculture value exposed: $359M · Risk-adjusted yearly loss: $18.8M
Risk by hazard
- Strong windRelatively High$1.8M/yr expected annual loss, about 6.1 events a year
- DroughtRelatively Moderate$1M/yr expected annual loss, about 11 events a year
- HailRelatively Low$712K/yr expected annual loss, about 4.1 events a year
- TornadoRelatively Moderate$2.9M/yr expected annual loss, about once every 2 years
- Cold waveRelatively Moderate$2.3M/yr expected annual loss, about 5.8 events a year
- EarthquakeVery Low$308K/yr expected annual loss, about once every 762 years
- Ice stormRelatively Low$67.8K/yr expected annual loss, about once every 2 years
- LandslideVery Low$635/yr expected annual loss, about once every 9 years
- Heat waveVery Low$172K/yr expected annual loss, about 3.7 events a year
- Winter weatherRelatively Low$33.3K/yr expected annual loss, about 14 events a year
- LightningRelatively Low$119K/yr expected annual loss, about 42 events a year
- HurricaneVery Low$4,621/yr expected annual loss, about once every 123 years
- WildfireVery Low$3,427/yr expected annual loss, about once every 18,697 years
Bars show the national percentile score (0 to 100) for each hazard. Dollar figures are expected annual losses to buildings, people and crops. Not rated here: avalanche, coastal flooding, riverine flooding, tsunami, volcanic activity.
Flood risk and insurance
National Flood Insurance Program and FEMA flood maps
Check the flood zone for an address
- Homes with flood insurance
- 93 of 16,175 (0.6%)
- Homes in high-risk flood zones
- 583
- Insured in high-risk zones
- 82 (14%)
- Flood claims since 1978
- 142
- Claims paid since 1978
- $730K
Flood claims paid per year
- Flooding$71.5K · 27 claims
- Mid-spring storms$24K · 4 claims
- Hurricane Ike$6,687 · 1 claim
Storm history
Since 1996: 471 events, 0 deaths, $2.5M in damage
- Thunderstorm Wind165
- Hail99
- Winter Storm29
- Winter Weather23
- Tornado21
- Flash Flood18
- Drought16
- Extreme Cold/Wind Chill15
- High Wind14
- Cold/Wind Chill14
Events per year
39 tornadoes on record (EF0 5, EF1 7, EF2 2, F0 10, F1 6, F2 4).
Most damaging storms
Since 1996, ranked by deaths, injuries and damage
- TornadoEF2, 7.8 mi path, 880 yd wide06/23/2015
Maytown, Lee County
7 injured, $1M damage
What happened
Very significant tree damage occurred with many large trees snapped or uprooted in Woodhaven Lakes Camping Resort. At least one house was pushed off of its foundation. Several trees fell onto recreational vehicles and it was estimated that around 100 of the 300 homes in the area received some degree of damage. One person was taken to the hospital in serious condition, and six others were injured. Peak winds were estimated to be 130 mph. (Tornado 3 of 10).
- Thunderstorm Wind65 kt wind06/12/2001
Countywide, Lee County
1 injured, $55K damage
What happened
A weakening thunderstorm moved into western Lee county around 11 am CST on June 12th. Reports of wind speeds to 70 mph were received which knocked down trees, power lines, and utility poles across the entire county. One man suffered minor injuries when the construction trailer he was in was blown over by high winds. A tree fell on a garage in Dixon causing minor damage. A large light stand fell at a park in Dixon. Over 20,000 residents lost power.
- TornadoEF1, 3.62 mi path, 100 yd wide04/10/2015
Franklin Grove, Lee County
$1M damage
What happened
This is the beginning of the Rochelle-Fairdale EF-4 tornado. At its strongest, peak winds were estimated to be 200 mph. The tornado touched down just northeast of Franklin Grove. A large sheet metal building on IL-38 collapsed with failure of column anchorage. Several smaller sheet metal buildings were destroyed along E Gurler Road. Peak winds in Lee County were estimated to 110 mph. The tornado continued into Ogle County. (Tornado 2a of 7).
- Thunderstorm Wind87 kt wind06/24/2013
Harmon, Lee County
$100K damage
- TornadoEF1, 1.1 mi path, 50 yd wide10/26/2010
Ashton, Lee County
$100K damage
- TornadoEF2, 9.29 mi path, 350 yd wide04/01/2023
Woodhaven Lakes, Lee County
What happened
The tornado touched down in the Woodhaven Lakes campground south of Amboy. There, multiple campers were damaged by the tornado including two that were rolled. Farther along its northeastward track, two trees had fallen onto a home destroying it. The tornado appeared to have reached its maximum intensity with wind speeds estimated at 115 mph shortly after crossing US Hwy 52 where it destroyed a large garage and snapped several trees at their trunks. Several dozen other large trees were snapped and many branches sheared off along its path. Toward the end of its lifespan, the tornado also did minor damage to an outbuilding before lifting near Butler Hill Rd north of West Brooklyn.
Drinking water
17 community water systems serve about 28,097 people. Violations since 2021.
3 systems had health-based violations, such as a contaminant over the legal limit or a missed treatment step. 3 systems had a violation of any kind still open at last report.
- DixonServes 15,096 · Groundwater · Local governmentNo health violations+2 monitoring or reporting
- WoodhavenServes 4,100 · Groundwater · PrivateNo health violations+3 monitoring or reporting
- AmboyServes 2,500 · Groundwater · Local governmentNo health violations
- Dixon Correctional CenterServes 1,038 · Groundwater · StateNo health violations
- AshtonServes 967 · Groundwater · Local governmentNo health violations+6 monitoring or reporting
- Franklin GroveServes 896 · Groundwater · Local governmentNo health violations+9 monitoring or reporting
- Paw PawServes 830 · Groundwater · Local governmentNo health violations
- White Oaks Estates Water Assoc., INC.Serves 410 · Groundwater · PrivateNo health violations
Largest systems by population served. Monitoring and reporting violations mean required tests or notices were late or missing, not that the water was unsafe.
Pollution sites
0 Superfund sites and 8 toxic release facilities in Lee County
Superfund sites
None in this county.
Toxic release facilities
- Invenergy Nelson LLC70,062 lbs released, Rock Falls
- UPM Raflatac Inc.26,350 lbs released, Dixon
- Chs Rochelle19,040 lbs released, Rochelle
- Donaldson Co Dixon Illinois6,587 lbs released, Dixon
- Azz Galvanizing Services-Dixon5,144 lbs released, Dixon
- Allied-Locke Industries Inc394 lbs released, Amboy
- Spx Cooling Tech LLC (Formerly Sgs Refrigeration Inc.)42.7 lbs released, Dixon
- Raynor Manufacturing Corporate Drive Campus0 lbs released, Dixon
Total: 127,619 lbs in 2024, 122,158 lbs to air.
Superfund sitesToxic release facilitiesEPA inspections and enforcementAir toxics cancer risk8 historic places
Frequently asked questions
- How risky is Lee County for natural disasters?
- FEMA rates Lee County relatively low for overall natural hazard risk, with expected losses of $20.6M a year. The highest-rated hazards are strong wind (relatively high), drought (relatively moderate), hail (relatively low).
- What storms are most common in Lee County?
- Since 1996, NOAA recorded 471 storm events affecting Lee County, most often thunderstorm wind (165), hail (99), winter storm (29).
- How many tornadoes have hit Lee County?
- 39 tornadoes have been recorded in Lee County since 1950.
- How many homes in Lee County have flood insurance?
- 93 residential flood insurance policies are in force in Lee County, covering about 0.6% of homes. The program has paid $730K on 142 claims here since 1978.
- What is the weather like in Lee County?
- At Compton 1 NW, average highs reach 83°F in Jul and lows fall to 12°F in Jan (1991-2020 normals).
Source: FEMA (National Risk Index, NFIP), NOAA (Storm Events, HURDAT2, Climate Normals), EPA · Last updated 08/01/2026 · Storm counts include events in forecast zones that touch the county. This product uses the FEMA OpenFEMA API, but is not endorsed by FEMA.