riskbycounty
FEMA NRI v1.20Released December 2025Methodology

Marshall County Disaster Risk

Marshall County, Iowa

FEMA Risk Rating

Relatively Low

NRI score (0–100 relative scale)

62.5

FEMA composite county value

State Rank

#14

of 99, sorted high to low by RiskByCounty

Flood NRI score

63.1

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

82.7 / 100

Flood

63.1 / 100

Higher of FEMA Coastal Flooding (Not available) and Inland Flooding (63.1) NRI scores.

Wildfire

62.1 / 100

Earthquake

27.5 / 100

Hurricane

15.2 / 100

FEMA NRI data summary

Selected hazard scores for Marshall County

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

Tornado
82.7
Flood
63.1
Wildfire
62.1
Earthquake
27.5
Hurricane
15.2

Higher of FEMA Coastal Flooding and Inland Flooding NRI scores

Displayed flood score
63.1
Coastal Flooding
Not available
Inland Flooding
63.1

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 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 Marshall County, IA?
Marshall County has an official FEMA NRI v1.20 composite rating of Relatively Low and an NRI score (0–100 relative scale) of 62.5. RiskByCounty ranks it 14th of 99 Iowa county records when sorting the FEMA composite NRI scores from high to low.
Which selected hazard scores are shown for Marshall County?
RiskByCounty displays five selected hazard categories out of FEMA's 18 using FEMA NRI v1.20 (December 2025). For Marshall County, Tornado: 82.7; Flood: 63.1; Wildfire: 62.1; Earthquake: 27.5; Hurricane: 15.2.
How is flood displayed for Marshall County?
RiskByCounty's flood display is the higher of FEMA Coastal Flooding and Inland Flooding NRI scores. For Marshall County, Coastal Flooding is Not available, Inland Flooding is 63.1, and the displayed flood score is 63.1.

Counties with Similar Risk

Lee County

Iowa

+0.5

Relatively Low

NRI score 62.9

Dubuque County

Iowa

+1.1

Relatively Low

NRI score 63.6

Crawford County

Iowa

-1.6

Relatively Low

NRI score 60.8

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 Marshall County

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