FEMA NRI v1.20Released December 2025Methodology

Alaska Disaster Risk

Natural disaster risk data for all 30 counties.

FEMA release

December 2025

Mean county NRI score

35.2

Counties with Data

of 30 total

County risk atlas

Alaska hazard exposure by county

FEMA NRI v1.20 scores on a 0–100 relative scale. Toggle the composite and five selected hazard categories out of FEMA's 18. Flood is the higher of Coastal Flooding and Inland Flooding NRI scores.

Counties

30/30

Mean county NRI score

35.2

Risk layers

Highest Risk Counties

Anchorage Municipality

Relatively High

NRI score 97.4

Matanuska-Susitna Borough

Relatively Moderate

NRI score 93.3

Kenai Peninsula Borough

Relatively Moderate

NRI score 93.0

Fairbanks North Star Borough

Relatively Moderate

NRI score 88.5

Aleutians West Census Area

Relatively Low

NRI score 67.3

Lowest Risk Counties

Wrangell City and Borough

Very Low

NRI score 0.1

Skagway Municipality

Very Low

NRI score 0.5

Prince of Wales-Hyder Census Area

Very Low

NRI score 1.0

Bristol Bay Borough

Very Low

NRI score 1.2

Ketchikan Gateway Borough

Very Low

NRI score 1.7

All Alaska Counties

County	NRI score	FEMA Rating	Flood	Wildfire	Tornado	Earthquake
Anchorage Municipality	97.4	Relatively High	28.0	78.6	0.4	99.5
Matanuska-Susitna Borough	93.3	Relatively Moderate	51.3	94.7	0.9	98.9
Kenai Peninsula Borough	93.0	Relatively Moderate	43.8	97.1	0.8	98.7
Fairbanks North Star Borough	88.5	Relatively Moderate	45.7	97.6	0.7	97.6
Aleutians West Census Area	67.3	Relatively Low	0.0	0.0	0.6	89.7
Kodiak Island Borough	65.1	Relatively Low	4.4	23.2	0.5	94.7
Yukon-Koyukuk Census Area	61.5	Relatively Low	6.6	93.0	0.7	75.3
Kusilvak Census Area	57.9	Relatively Low	0.0	46.9	0.9	24.6
Southeast Fairbanks Census Area	57.0	Relatively Low	9.4	97.1	0.8	86.5
Northwest Arctic Borough	54.6	Relatively Low	3.4	65.7	0.5	65.7
Bethel Census Area	44.3	Relatively Low	9.6	83.8	1.4	49.4
Copper River Census Area	39.9	Very Low	1.9	83.7	0.4	77.8
Dillingham Census Area	35.7	Very Low	3.1	62.2	0.6	75.0
Nome Census Area	34.1	Very Low	5.7	45.2	0.5	73.5
Denali Borough	28.3	Very Low	1.5	84.8	0.3	78.9
Sitka City and Borough	23.8	Very Low	34.0	8.7	0.1	83.9
Aleutians East Borough	21.3	Very Low	0.0	0.1	1.0	74.6
Chugach Census Area	19.6	Very Low	20.8	1.3	0.1	81.8
Petersburg Borough	15.4	Very Low	1.0	3.4	0.3	18.3
North Slope Borough	14.8	Very Low	2.6	11.4	0.7	50.2
Hoonah-Angoon Census Area	14.3	Very Low	22.8	5.6	0.4	73.2
Juneau City and Borough	11.5	Very Low	38.0	19.5	0.6	80.5
Lake and Peninsula Borough	6.3	Very Low	0.2	45.5	0.8	79.7
Haines Borough	4.3	Very Low	0.8	5.0	0.2	64.5
Yakutat City and Borough	3.0	Very Low	0.3	1.7	0.2	77.4
Ketchikan Gateway Borough	1.7	Very Low	26.0	10.9	0.2	31.2
Bristol Bay Borough	1.2	Very Low	0.0	34.2	0.3	71.9
Prince of Wales-Hyder Census Area	1.0	Very Low	3.8	10.1	0.3	43.0
Skagway Municipality	0.5	Very Low	0.3	2.4	0.0	43.9
Wrangell City and Borough	0.1	Very Low	0.4	1.5	0.1	13.0

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.

Official Ready.gov resource

Continue to Ready.gov for federal emergency-planning information maintained outside RiskByCounty.

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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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