riskbycounty
FEMA NRI v1.20Released December 2025Methodology

St. Clair County Disaster Risk

St. Clair County, Michigan

FEMA Risk Rating

Relatively Moderate

NRI score (0–100 relative scale)

82.0

FEMA composite county value

State Rank

#11

of 83, sorted high to low by RiskByCounty

Flood NRI score

85.9

higher coastal/inland value

Hazard Risk Breakdown

Five selected hazard categories out of FEMA's 18. Values are FEMA NRI v1.20 scores on a 0–100 relative scale.

Tornado

87.2 / 100

Flood

85.9 / 100

Higher of FEMA Coastal Flooding (46.2) and Inland Flooding (85.9) NRI scores.

Earthquake

50.8 / 100

Hurricane

35.8 / 100

Wildfire

33.5 / 100

FEMA NRI data summary

Selected hazard scores for St. Clair County

Among the five hazard categories displayed by RiskByCounty, tornado has the highest NRI score for this county.

Tornado
87.2
Flood
85.9
Earthquake
50.8
Hurricane
35.8
Wildfire
33.5

Higher of FEMA Coastal Flooding and Inland Flooding NRI scores

Displayed flood score
85.9
Coastal Flooding
46.2
Inland Flooding
85.9

These five categories are a selected subset of FEMA's 18 natural hazards. FEMA's composite score and official rating are separate fields in the National Risk Index dataset.

FEMA National Risk Index documentation

Official Ready.gov resource

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Frequently Asked Questions

How many Michigan county records are included?
RiskByCounty includes 83 Michigan county records from FEMA NRI v1.20 (December 2025).
Which FEMA county ratings appear in Michigan?
FEMA NRI v1.20 (December 2025) county rating counts for Michigan: Very Low: 33; Relatively Low: 37; Relatively Moderate: 10; Relatively High: 3; Very High: 0; Not available: 0.
How complete are the five selected hazard fields for Michigan?
FEMA NRI v1.20 (December 2025) availability among 83 county records: Flood: 83 of 83; Wildfire: 83 of 83; Tornado: 83 of 83; Earthquake: 83 of 83; Hurricane: 83 of 83. RiskByCounty displays five selected hazard categories out of FEMA's 18.
What FEMA NRI information is available for St. Clair County, MI?
St. Clair County has an official FEMA NRI v1.20 composite rating of Relatively Moderate and an NRI score (0–100 relative scale) of 82.0. RiskByCounty ranks it 11th of 83 Michigan county records when sorting the FEMA composite NRI scores from high to low.
Which selected hazard scores are shown for St. Clair County?
RiskByCounty displays five selected hazard categories out of FEMA's 18 using FEMA NRI v1.20 (December 2025). For St. Clair County, Tornado: 87.2; Flood: 85.9; Earthquake: 50.8; Hurricane: 35.8; Wildfire: 33.5.
How is flood displayed for St. Clair County?
RiskByCounty's flood display is the higher of FEMA Coastal Flooding and Inland Flooding NRI scores. For St. Clair County, Coastal Flooding is 46.2, Inland Flooding is 85.9, and the displayed flood score is 85.9.

Counties with Similar Risk

Berrien County

Michigan

-0.3

Relatively Moderate

NRI score 81.7

Kalamazoo County

Michigan

-0.3

Relatively Moderate

NRI score 81.7

Monroe County

Michigan

+0.5

Relatively Moderate

NRI score 82.5

Published by RiskByCounty

County summaries are deterministic transformations of frozen FEMA county fields. No external subject-matter reviewer is credited.

Published · Updated

Data Source

County data sourced from FEMA National Risk Index v1.20, released December 2025. Values are labeled NRI score (0–100 relative scale). RiskByCounty displays five selected hazard categories out of FEMA's 18; flood is the higher of the Coastal Flooding and Inland Flooding source scores.

RiskByCounty presents county-level source fields and deterministic arithmetic summaries.

Explore more data for St. Clair County

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