Ottawa County, Michigan Natural Disaster Risk
FEMA National Risk Index assessment · MI
MediumComposite Risk Score
National percentile: 83th
Ottawa County faces medium composite natural disaster risk (NRI Risk Index score 82.9, 83th national percentile), driven primarily by strong wind and riverine flood exposure. Expected annual loss across all 18 hazard types is $68M.
Source: FEMA National Risk Index v1.20 · Updated December 2025
Risk Overview
Ottawa County carries a medium composite natural disaster risk, with a National Risk Index score of 82.9 out of 100 — placing it in the 83rd national percentile and near the national midpoint for natural-disaster risk. 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 strong wind (damaging straight-line winds outside of tornadoes and hurricanes) at High risk — $7M in expected annual loss and about 2.17 events per year; riverine flood (rivers and streams overflowing their banks after heavy rain or snowmelt) at Medium risk — $45M in expected annual loss and about 0.68 events per year; and tornado (violently rotating columns of air capable of catastrophic local damage) at Medium risk — $8M in expected annual loss and about 0.37 events per year. Across all hazards, FEMA estimates $68M in expected annual loss for a population of 296K.
Beyond physical exposure, Ottawa County has a very low 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.
The federal record bears this out: Ottawa County has received 16 federal disaster declarations since 1965, including 4 for flood events and 4 for severe storm events. The most recent was Covid-19 Pandemic (biological), declared in March 2020.
Among 83 Michigan counties, Ottawa County ranks #9 for overall natural disaster risk.
Top Hazards
All 18 Hazard Risks
| Strong Wind | High | 2.17 / yr | $7M |
| Riverine Flood | Medium | 0.68 / yr | $45M |
| Tornado | Medium | 0.37 / yr | $8M |
| Hail | Medium | 1.20 / yr | $2M |
| Winter Weather | Medium | 32.18 / yr | $317K |
| Ice Storm | Medium | 1.21 / yr | $469K |
| Lightning | Medium | 32.61 / yr | $867K |
| Cold Wave | Medium | 1.00 / yr | $3M |
| Heat Wave | Low | 2.31 / yr | $939K |
| Earthquake | Low | 0.00 / yr | $665K |
| Landslide | Very Low | 0.11 / yr | $2K |
| Coastal Flood | Very Low | 0.01 / yr | $12K |
| Wildfire | Very Low | 0.00 / yr | $26K |
| Hurricane | Very Low | 0.01 / yr | $15K |
| 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
Ottawa County has received 16 federal disaster declarations since 1965, most recently Covid-19 Pandemic in March 2020. Most frequent causes: Flood (4), Severe Storm (4), Snowstorm (4).
| Declared | Type | Disaster |
|---|---|---|
| March 2020 | Biological | Covid-19 Pandemic |
| March 2020 | Biological | Covid-19 |
| June 2013 | Flood | Flooding |
| July 2008 | Severe Storm | Severe Storms, Tornadoes, and Flooding |
| September 2005 | Hurricane | Hurricane Katrina Evacuation |
| June 2004 | Severe Storm | Severe Storms, Tornadoes, and Flooding |
| January 2001 | Snowstorm | Snow |
| January 1999 | Snowstorm | Mi - Severe Weather 1/2 /99 |
| June 1998 | Severe Storm | Severe Storms |
| September 1986 | Flood | Severe Storms & Flooding |
Showing the 10 most recent of 16 declarations.
Source: FEMA Disaster Declarations Summaries (OpenFEMA).
Frequently Asked Questions
What is the overall natural disaster risk for Ottawa County?
Ottawa County has a composite FEMA National Risk Index score of 82.9 out of 100, placing it in the Medium category and the 83th national percentile. This combines Expected Annual Loss, Social Vulnerability, and Community Resilience across 18 hazard types.
What are the top natural hazards in Ottawa County?
The three highest-rated hazards are Strong Wind (High, $7M EAL), Riverine Flood (Medium, $45M EAL), Tornado (Medium, $8M EAL). These account for most of the county's expected annual losses.
How does Ottawa County compare to other Michigan counties?
Ottawa County ranks #9 of 83 Michigan counties for overall natural disaster risk, with a medium rating.
How many federally declared disasters has Ottawa County had?
FEMA records 16 federal disaster declarations for Ottawa County since 1965, most often 4 for flood events and 4 for severe storm 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. Ottawa County's $68M EAL is a statistical average, not a guarantee for any specific year or address.