riskbycounty
FEMA NRI v1.20Released December 2025Methodology

Yukon-Koyukuk Census Area Disaster Risk

Yukon-Koyukuk Census Area, Alaska

FEMA Risk Rating

Relatively Low

NRI score (0–100 relative scale)

61.5

FEMA composite county value

State Rank

#7

of 30, sorted high to low by RiskByCounty

Flood NRI score

6.6

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

93.0 / 100

Earthquake

75.3 / 100

Flood

6.6 / 100

Higher of FEMA Coastal Flooding (Not available) and Inland Flooding (6.6) NRI scores.

Tornado

0.7 / 100

FEMA NRI data summary

Selected hazard scores for Yukon-Koyukuk Census Area

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

Wildfire
93.0
Earthquake
75.3
Flood
6.6
Tornado
0.7
Hurricane
Not available

Higher of FEMA Coastal Flooding and Inland Flooding NRI scores

Displayed flood score
6.6
Coastal Flooding
Not available
Inland Flooding
6.6

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 Alaska county records are included?
RiskByCounty includes 30 Alaska county records from FEMA NRI v1.20 (December 2025).
Which FEMA county ratings appear in Alaska?
FEMA NRI v1.20 (December 2025) county rating counts for Alaska: Very Low: 19; Relatively Low: 7; Relatively Moderate: 3; Relatively High: 1; Very High: 0; Not available: 0.
How complete are the five selected hazard fields for Alaska?
FEMA NRI v1.20 (December 2025) availability among 30 county records: Flood: 30 of 30; Wildfire: 30 of 30; Tornado: 30 of 30; Earthquake: 30 of 30; Hurricane: 0 of 30. RiskByCounty displays five selected hazard categories out of FEMA's 18.
What FEMA NRI information is available for Yukon-Koyukuk Census Area, AK?
Yukon-Koyukuk Census Area has an official FEMA NRI v1.20 composite rating of Relatively Low and an NRI score (0–100 relative scale) of 61.5. RiskByCounty ranks it 7th of 30 Alaska county records when sorting the FEMA composite NRI scores from high to low.
Which selected hazard scores are shown for Yukon-Koyukuk Census Area?
RiskByCounty displays five selected hazard categories out of FEMA's 18 using FEMA NRI v1.20 (December 2025). For Yukon-Koyukuk Census Area, Wildfire: 93.0; Earthquake: 75.3; Flood: 6.6; Tornado: 0.7.
How is flood displayed for Yukon-Koyukuk Census Area?
RiskByCounty's flood display is the higher of FEMA Coastal Flooding and Inland Flooding NRI scores. For Yukon-Koyukuk Census Area, Coastal Flooding is Not available, Inland Flooding is 6.6, and the displayed flood score is 6.6.

Counties with Similar Risk

Kodiak Island Borough

Alaska

+3.6

Relatively Low

NRI score 65.1

Kusilvak Census Area

Alaska

-3.6

Relatively Low

NRI score 57.9

Southeast Fairbanks Census Area

Alaska

-4.5

Relatively Low

NRI score 57.0

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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