riskbycounty
FEMA NRI v1.20Released December 2025Methodology

Story County Disaster Risk

Story County, Iowa

FEMA Risk Rating

Relatively Low

NRI score (0–100 relative scale)

68.8

FEMA composite county value

State Rank

#9

of 99, sorted high to low by RiskByCounty

Flood NRI score

69.1

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

91.3 / 100

Flood

69.1 / 100

Higher of FEMA Coastal Flooding (Not available) and Inland Flooding (69.1) NRI scores.

Earthquake

34.8 / 100

Wildfire

30.3 / 100

Hurricane

14.4 / 100

FEMA NRI data summary

Selected hazard scores for Story County

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

Tornado
91.3
Flood
69.1
Earthquake
34.8
Wildfire
30.3
Hurricane
14.4

Higher of FEMA Coastal Flooding and Inland Flooding NRI scores

Displayed flood score
69.1
Coastal Flooding
Not available
Inland Flooding
69.1

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

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 Story County, IA?
Story County has an official FEMA NRI v1.20 composite rating of Relatively Low and an NRI score (0–100 relative scale) of 68.8. RiskByCounty ranks it 9th of 99 Iowa county records when sorting the FEMA composite NRI scores from high to low.
Which selected hazard scores are shown for Story County?
RiskByCounty displays five selected hazard categories out of FEMA's 18 using FEMA NRI v1.20 (December 2025). For Story County, Tornado: 91.3; Flood: 69.1; Earthquake: 34.8; Wildfire: 30.3; Hurricane: 14.4.
How is flood displayed for Story County?
RiskByCounty's flood display is the higher of FEMA Coastal Flooding and Inland Flooding NRI scores. For Story County, Coastal Flooding is Not available, Inland Flooding is 69.1, and the displayed flood score is 69.1.

Counties with Similar Risk

Cerro Gordo County

Iowa

+0.8

Relatively Low

NRI score 69.6

Wapello County

Iowa

-3.5

Relatively Low

NRI score 65.3

Clinton County

Iowa

-4.0

Relatively Low

NRI score 64.8

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 Story County

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