Bay County, Michigan Natural Disaster Risk
FEMA National Risk Index assessment · MI
LowComposite Risk Score
National percentile: 78th
Bay County faces low composite natural disaster risk (NRI Risk Index score 78.2, 78th national percentile), driven primarily by winter weather and strong wind exposure. Expected annual loss across all 18 hazard types is $38M.
Source: FEMA National Risk Index v1.20 · Updated December 2025
Risk Overview
FEMA's National Risk Index rates Bay County at low composite risk, with a National Risk Index score of 78.2 out of 100 — placing it in the 78th national percentile and below the national average for natural-disaster risk. The score blends Expected Annual Loss, Social Vulnerability, and Community Resilience across all 18 FEMA hazard types.
Risk here concentrates in winter weather (heavy snow, blizzards, and hazardous winter conditions) at High risk — $626K in expected annual loss and about 10.84 events per year; strong wind (damaging straight-line winds outside of tornadoes and hurricanes) at High risk — $3M in expected annual loss and about 3.22 events per year; and cold wave (prolonged spells of dangerously low temperatures) at High risk — $7M in expected annual loss and about 2.89 events per year. Across all hazards, FEMA estimates $38M in expected annual loss for a population of 104K.
Beyond physical exposure, Bay County has a medium social vulnerability rating (how susceptible the population is to harm) and a very 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.
History supports the rating: Bay County has received 14 federal disaster declarations since 1965, including 4 for severe storm events and 4 for flood events. The most recent was Covid-19 Pandemic (biological), declared in March 2020.
Among 83 Michigan counties, Bay County ranks #14 for overall natural disaster risk.
Top Hazards
All 18 Hazard Risks
| Winter Weather | High | 10.84 / yr | $626K |
| Strong Wind | High | 3.22 / yr | $3M |
| Cold Wave | High | 2.89 / yr | $7M |
| Tornado | Medium | 0.21 / yr | $5M |
| Hail | Medium | 2.03 / yr | $1M |
| Riverine Flood | Medium | 0.71 / yr | $21M |
| Ice Storm | Medium | 0.71 / yr | $148K |
| Lightning | Medium | 30.89 / yr | $297K |
| Heat Wave | Low | 2.16 / yr | $435K |
| Coastal Flood | Low | 0.01 / yr | $51K |
| Earthquake | Very Low | 0.00 / yr | $169K |
| Hurricane | Very Low | 0.02 / yr | $35K |
| Landslide | Very Low | 0.05 / yr | $60 |
| Wildfire | Very Low | 0.00 / 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
Bay County has received 14 federal disaster declarations since 1965, most recently Covid-19 Pandemic in March 2020. Most frequent causes: Severe Storm (4), Flood (4), Biological (2).
| Declared | Type | Disaster |
|---|---|---|
| March 2020 | Biological | Covid-19 Pandemic |
| March 2020 | Biological | Covid-19 |
| August 2017 | Severe Storm | Severe Storms and Flooding |
| September 2005 | Hurricane | Hurricane Katrina Evacuation |
| January 2001 | Snowstorm | Snow |
| June 1998 | Severe Storm | Severe Storms |
| July 1996 | Severe Storm | Severe Storms and Flooding |
| September 1986 | Flood | Severe Storms & Flooding |
| September 1985 | Flood | Severe Storms and Flooding |
| January 1978 | Snowstorm | Blizzards & Snowstorms |
Showing the 10 most recent of 14 declarations.
Source: FEMA Disaster Declarations Summaries (OpenFEMA).
Frequently Asked Questions
What is the overall natural disaster risk for Bay County?
Bay County has a composite FEMA National Risk Index score of 78.2 out of 100, placing it in the Low category and the 78th national percentile. This combines Expected Annual Loss, Social Vulnerability, and Community Resilience across 18 hazard types.
What are the top natural hazards in Bay County?
The three highest-rated hazards are Winter Weather (High, $626K EAL), Strong Wind (High, $3M EAL), Cold Wave (High, $7M EAL). These account for most of the county's expected annual losses.
How does Bay County compare to other Michigan counties?
Bay County ranks #14 of 83 Michigan counties for overall natural disaster risk, with a low rating.
How many federally declared disasters has Bay County had?
FEMA records 14 federal disaster declarations for Bay County since 1965, most often 4 for severe storm events and 4 for flood events. The most recent was Covid-19 Pandemic, declared in March 2020.
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. Bay County's $38M EAL is a statistical average, not a guarantee for any specific year or address.