riskbycounty
FEMA NRI v1.20Released December 2025Methodology

Fall River County Disaster Risk

Fall River County, South Dakota

FEMA Risk Rating

Very Low

NRI score (0–100 relative scale)

30.9

FEMA composite county value

State Rank

#25

of 66, sorted high to low by RiskByCounty

Flood NRI score

41.5

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.

Wildfire

93.8 / 100

Flood

41.5 / 100

Higher of FEMA Coastal Flooding (Not available) and Inland Flooding (41.5) NRI scores.

Earthquake

35.1 / 100

Tornado

29.6 / 100

FEMA NRI data summary

Selected hazard scores for Fall River County

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

Wildfire
93.8
Flood
41.5
Earthquake
35.1
Tornado
29.6
Hurricane
Not available

Higher of FEMA Coastal Flooding and Inland Flooding NRI scores

Displayed flood score
41.5
Coastal Flooding
Not available
Inland Flooding
41.5

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 South Dakota county records are included?
RiskByCounty includes 66 South Dakota county records from FEMA NRI v1.20 (December 2025).
Which FEMA county ratings appear in South Dakota?
FEMA NRI v1.20 (December 2025) county rating counts for South Dakota: Very Low: 50; Relatively Low: 15; Relatively Moderate: 1; Relatively High: 0; Very High: 0; Not available: 0.
How complete are the five selected hazard fields for South Dakota?
FEMA NRI v1.20 (December 2025) availability among 66 county records: Flood: 66 of 66; Wildfire: 66 of 66; Tornado: 66 of 66; Earthquake: 66 of 66; Hurricane: 0 of 66. RiskByCounty displays five selected hazard categories out of FEMA's 18.
What FEMA NRI information is available for Fall River County, SD?
Fall River County has an official FEMA NRI v1.20 composite rating of Very Low and an NRI score (0–100 relative scale) of 30.9. RiskByCounty ranks it 25th of 66 South Dakota county records when sorting the FEMA composite NRI scores from high to low.
Which selected hazard scores are shown for Fall River County?
RiskByCounty displays five selected hazard categories out of FEMA's 18 using FEMA NRI v1.20 (December 2025). For Fall River County, Wildfire: 93.8; Flood: 41.5; Earthquake: 35.1; Tornado: 29.6.
How is flood displayed for Fall River County?
RiskByCounty's flood display is the higher of FEMA Coastal Flooding and Inland Flooding NRI scores. For Fall River County, Coastal Flooding is Not available, Inland Flooding is 41.5, and the displayed flood score is 41.5.

Counties with Similar Risk

Lake County

South Dakota

+1.7

Very Low

NRI score 32.6

Day County

South Dakota

-3.3

Very Low

NRI score 27.6

Moody County

South Dakota

-4.0

Very Low

NRI score 26.9

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.

Explore more data for Fall River County

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