Lake County, Indiana Natural Disaster Risk
FEMA National Risk Index assessment · IN
HighComposite Risk Score
National percentile: 96th
Lake County faces high composite natural disaster risk (NRI Risk Index score 95.9, 96th national percentile), driven primarily by cold wave and tornado exposure. Expected annual loss across all 18 hazard types is $191M.
Source: FEMA National Risk Index v1.20 · Updated December 2025
Risk Overview
Overall natural disaster risk in Lake County is high, with a National Risk Index score of 95.9 out of 100 — placing it in the 96th national percentile and in the upper tier of natural-disaster risk nationally. The score blends Expected Annual Loss, Social Vulnerability, and Community Resilience across all 18 FEMA hazard types.
The county's risk is driven primarily by cold wave (prolonged spells of dangerously low temperatures) at Very High risk — $47M in expected annual loss and about 3.63 events per year; tornado (violently rotating columns of air capable of catastrophic local damage) at Very High risk — $41M in expected annual loss and about 0.42 events per year; and riverine flood (rivers and streams overflowing their banks after heavy rain or snowmelt) at High risk — $90M in expected annual loss and about 2.39 events per year. Across all hazards, FEMA estimates $191M in expected annual loss for a population of 498K.
Beyond physical exposure, Lake County has a medium social vulnerability rating (how susceptible the population is to harm) and a high community resilience rating (its capacity to prepare for and recover from disasters). A less vulnerable population paired with strong resilience helps the community absorb and recover from events.
The federal record bears this out: Lake County has received 22 federal disaster declarations since 1977, including 11 for severe storm events and 4 for snowstorm events. The most recent was Severe Winter Storm (winter storm), declared in January 2026.
Among 92 Indiana counties, Lake County ranks #2 for overall natural disaster risk.
Top Hazards
All 18 Hazard Risks
| Cold Wave | Very High | 3.63 / yr | $47M |
| Tornado | Very High | 0.42 / yr | $41M |
| Riverine Flood | High | 2.39 / yr | $90M |
| Winter Weather | High | 14.06 / yr | $576K |
| Heat Wave | Medium | 3.16 / yr | $4M |
| Strong Wind | High | 5.52 / yr | $2M |
| Lightning | High | 43.47 / yr | $1M |
| Earthquake | Low | 0.00 / yr | $4M |
| Ice Storm | Medium | 0.87 / yr | $299K |
| Hail | Low | 3.74 / yr | $560K |
| Wildfire | Low | 0.00 / yr | $120K |
| Landslide | Very Low | 0.11 / yr | $2K |
| Coastal Flood | Very Low | 0.01 / yr | $20K |
| Hurricane | Very Low | 0.01 / yr | $5K |
| Avalanche | Very Low | 0.00 / yr | $0 |
| Drought | Very Low | 0.00 / yr | $0 |
| Tsunami | Very Low | 0.00 / yr | $0 |
| Volcanic Activity | Very Low | 0.00 / yr | $0 |
Disaster History
Lake County has received 22 federal disaster declarations since 1977, most recently Severe Winter Storm in January 2026. Most frequent causes: Severe Storm (11), Snowstorm (4), Flood (3).
| Declared | Type | Disaster |
|---|---|---|
| January 2026 | Winter Storm | Severe Winter Storm |
| April 2023 | Severe Storm | Severe Storms, Straight-Line Winds, and Tornadoes |
| April 2020 | Biological | Covid-19 Pandemic |
| March 2020 | Biological | Covid-19 |
| May 2018 | Flood | Severe Storms and Flooding |
| April 2014 | Severe Storm | Severe Winter Storm and Snowstorm |
| April 2009 | Severe Storm | Severe Storms, Tornadoes, and Flooding |
| September 2008 | Severe Storm | Severe Storms and Flooding |
| January 2008 | Severe Storm | Severe Storms and Flooding |
| November 2007 | Severe Storm | Severe Storms and Flooding |
Showing the 10 most recent of 22 declarations.
Source: FEMA Disaster Declarations Summaries (OpenFEMA).
Frequently Asked Questions
What is the overall natural disaster risk for Lake County?
Lake County has a composite FEMA National Risk Index score of 95.9 out of 100, placing it in the High category and the 96th national percentile. This combines Expected Annual Loss, Social Vulnerability, and Community Resilience across 18 hazard types.
What are the top natural hazards in Lake County?
The three highest-rated hazards are Cold Wave (Very High, $47M EAL), Tornado (Very High, $41M EAL), Riverine Flood (High, $90M EAL). These account for most of the county's expected annual losses.
How does Lake County compare to other Indiana counties?
Lake County ranks #2 of 92 Indiana counties for overall natural disaster risk, with a high rating.
How many federally declared disasters has Lake County had?
FEMA records 22 federal disaster declarations for Lake County since 1977, most often 11 for severe storm events and 4 for snowstorm events. The most recent was Severe Winter Storm, declared in January 2026.
What does Expected Annual Loss (EAL) mean?
EAL is FEMA's estimate of average annual dollar losses from natural hazards, calculated from historical event data and exposure models. Lake County's $191M EAL is a statistical average, not a guarantee for any specific year or address.