riskbycounty
FEMA NRI v1.20Released December 2025Methodology

Clayton County Disaster Risk

Clayton County, Iowa

FEMA Risk Rating

Very Low

NRI score (0–100 relative scale)

42.2

FEMA composite county value

State Rank

#37

of 99, sorted high to low by RiskByCounty

Flood NRI score

58.0

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

58.0 / 100

Higher of FEMA Coastal Flooding (Not available) and Inland Flooding (58.0) NRI scores.

Tornado

54.0 / 100

Hurricane

14.9 / 100

Earthquake

14.5 / 100

Wildfire

12.3 / 100

FEMA NRI data summary

Selected hazard scores for Clayton County

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

Flood
58.0
Tornado
54.0
Hurricane
14.9
Earthquake
14.5
Wildfire
12.3

Higher of FEMA Coastal Flooding and Inland Flooding NRI scores

Displayed flood score
58.0
Coastal Flooding
Not available
Inland Flooding
58.0

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

Continue to Ready.gov for federal emergency-planning information maintained outside RiskByCounty.

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Frequently Asked Questions

How many Iowa county records are included?
RiskByCounty includes 99 Iowa county records from FEMA NRI v1.20 (December 2025).
Which FEMA county ratings appear in Iowa?
FEMA NRI v1.20 (December 2025) county rating counts for Iowa: Very Low: 64; Relatively Low: 30; Relatively Moderate: 5; Relatively High: 0; Very High: 0; Not available: 0.
How complete are the five selected hazard fields for Iowa?
FEMA NRI v1.20 (December 2025) availability among 99 county records: Flood: 99 of 99; Wildfire: 99 of 99; Tornado: 99 of 99; Earthquake: 99 of 99; Hurricane: 82 of 99. RiskByCounty displays five selected hazard categories out of FEMA's 18.
What FEMA NRI information is available for Clayton County, IA?
Clayton County has an official FEMA NRI v1.20 composite rating of Very Low and an NRI score (0–100 relative scale) of 42.2. RiskByCounty ranks it 37th of 99 Iowa county records when sorting the FEMA composite NRI scores from high to low.
Which selected hazard scores are shown for Clayton County?
RiskByCounty displays five selected hazard categories out of FEMA's 18 using FEMA NRI v1.20 (December 2025). For Clayton County, Flood: 58.0; Tornado: 54.0; Hurricane: 14.9; Earthquake: 14.5; Wildfire: 12.3.
How is flood displayed for Clayton County?
RiskByCounty's flood display is the higher of FEMA Coastal Flooding and Inland Flooding NRI scores. For Clayton County, Coastal Flooding is Not available, Inland Flooding is 58.0, and the displayed flood score is 58.0.

Counties with Similar Risk

Emmet County

Iowa

+0.5

Very Low

NRI score 42.7

Wright County

Iowa

-0.7

Very Low

NRI score 41.5

Hamilton County

Iowa

+0.7

Relatively Low

NRI score 42.9

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.

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