riskbycounty
FEMA NRI v1.20Released December 2025Methodology

Delta County Disaster Risk

Delta County, Michigan

FEMA Risk Rating

Relatively Low

NRI score (0–100 relative scale)

53.1

FEMA composite county value

State Rank

#41

of 83, sorted high to low by RiskByCounty

Flood NRI score

60.4

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.

Flood

60.4 / 100

Higher of FEMA Coastal Flooding (36.6) and Inland Flooding (60.4) NRI scores.

Wildfire

49.7 / 100

Tornado

24.2 / 100

Earthquake

6.7 / 100

Hurricane

0.0 / 100

FEMA NRI data summary

Selected hazard scores for Delta County

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

Flood
60.4
Wildfire
49.7
Tornado
24.2
Earthquake
6.7
Hurricane
0.0

Higher of FEMA Coastal Flooding and Inland Flooding NRI scores

Displayed flood score
60.4
Coastal Flooding
36.6
Inland Flooding
60.4

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 Delta County, MI?
Delta County has an official FEMA NRI v1.20 composite rating of Relatively Low and an NRI score (0–100 relative scale) of 53.1. RiskByCounty ranks it 41st of 83 Michigan county records when sorting the FEMA composite NRI scores from high to low.
Which selected hazard scores are shown for Delta County?
RiskByCounty displays five selected hazard categories out of FEMA's 18 using FEMA NRI v1.20 (December 2025). For Delta County, Flood: 60.4; Wildfire: 49.7; Tornado: 24.2; Earthquake: 6.7; Hurricane: 0.0.
How is flood displayed for Delta County?
RiskByCounty's flood display is the higher of FEMA Coastal Flooding and Inland Flooding NRI scores. For Delta County, Coastal Flooding is 36.6, Inland Flooding is 60.4, and the displayed flood score is 60.4.

Counties with Similar Risk

Gratiot County

Michigan

+1.1

Relatively Low

NRI score 54.1

Branch County

Michigan

-1.2

Relatively Low

NRI score 51.8

Iron County

Michigan

+2.0

Relatively Low

NRI score 55.1

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 Delta County

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