riskbycounty
FEMA NRI v1.20Released December 2025Methodology

St. Mary Parish Disaster Risk

St. Mary Parish, Louisiana

FEMA Risk Rating

Relatively Moderate

NRI score (0–100 relative scale)

88.9

FEMA composite county value

State Rank

#14

of 64, sorted high to low by RiskByCounty

Flood NRI score

93.0

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.

Hurricane

97.3 / 100

Flood

93.0 / 100

Higher of FEMA Coastal Flooding (93.0) and Inland Flooding (50.1) NRI scores.

Tornado

86.4 / 100

Earthquake

43.7 / 100

Wildfire

15.0 / 100

FEMA NRI data summary

Selected hazard scores for St. Mary Parish

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

Hurricane
97.3
Flood
93.0
Tornado
86.4
Earthquake
43.7
Wildfire
15.0

Higher of FEMA Coastal Flooding and Inland Flooding NRI scores

Displayed flood score
93.0
Coastal Flooding
93.0
Inland Flooding
50.1

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

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Frequently Asked Questions

How many Louisiana county records are included?
RiskByCounty includes 64 Louisiana county records from FEMA NRI v1.20 (December 2025).
Which FEMA county ratings appear in Louisiana?
FEMA NRI v1.20 (December 2025) county rating counts for Louisiana: Very Low: 21; Relatively Low: 19; Relatively Moderate: 17; Relatively High: 7; Very High: 0; Not available: 0.
How complete are the five selected hazard fields for Louisiana?
FEMA NRI v1.20 (December 2025) availability among 64 county records: Flood: 64 of 64; Wildfire: 64 of 64; Tornado: 64 of 64; Earthquake: 64 of 64; Hurricane: 64 of 64. RiskByCounty displays five selected hazard categories out of FEMA's 18.
What FEMA NRI information is available for St. Mary Parish, LA?
St. Mary Parish has an official FEMA NRI v1.20 composite rating of Relatively Moderate and an NRI score (0–100 relative scale) of 88.9. RiskByCounty ranks it 14th of 64 Louisiana county records when sorting the FEMA composite NRI scores from high to low.
Which selected hazard scores are shown for St. Mary Parish?
RiskByCounty displays five selected hazard categories out of FEMA's 18 using FEMA NRI v1.20 (December 2025). For St. Mary Parish, Hurricane: 97.3; Flood: 93.0; Tornado: 86.4; Earthquake: 43.7; Wildfire: 15.0.
How is flood displayed for St. Mary Parish?
RiskByCounty's flood display is the higher of FEMA Coastal Flooding and Inland Flooding NRI scores. For St. Mary Parish, Coastal Flooding is 93.0, Inland Flooding is 50.1, and the displayed flood score is 93.0.

Counties with Similar Risk

Acadia Parish

Louisiana

-0.3

Relatively Moderate

NRI score 88.6

St. Landry Parish

Louisiana

-0.7

Relatively Moderate

NRI score 88.2

Ouachita Parish

Louisiana

-1.4

Relatively Moderate

NRI score 87.5

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.

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