FEMA NRI v1.20Released December 2025Methodology

Idaho Disaster Risk

Natural disaster risk data for all 44 counties.

FEMA release

December 2025

Mean county NRI score

38.5

Counties with Data

of 44 total

County risk atlas

Idaho 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

44/44

Mean county NRI score

38.5

Risk layers

Highest Risk Counties

Ada County

Relatively Moderate

NRI score 87.8

Bonneville County

Relatively Moderate

NRI score 82.4

Kootenai County

Relatively Low

NRI score 79.0

Idaho County

Relatively Low

NRI score 78.4

Bonner County

Relatively Low

NRI score 77.3

Lowest Risk Counties

Clark County

Very Low

NRI score 0.8

Oneida County

Very Low

NRI score 1.4

Lewis County

Very Low

NRI score 3.1

Butte County

Very Low

NRI score 4.4

Camas County

Very Low

NRI score 6.0

All Idaho Counties

County	NRI score	FEMA Rating	Flood	Wildfire	Tornado	Earthquake
Ada County	87.8	Relatively Moderate	89.8	98.3	27.0	88.2
Bonneville County	82.4	Relatively Moderate	78.6	90.3	16.2	94.2
Kootenai County	79.0	Relatively Low	86.3	79.5	22.0	79.2
Idaho County	78.4	Relatively Low	72.9	98.7	6.1	40.1
Bonner County	77.3	Relatively Low	87.0	82.7	10.3	55.8
Canyon County	71.7	Relatively Low	80.3	92.5	20.8	78.8
Bannock County	66.9	Relatively Low	51.9	96.9	15.1	82.8
Blaine County	65.4	Relatively Low	70.5	93.8	7.7	73.7
Shoshone County	62.8	Relatively Low	76.0	69.6	4.0	38.4
Bingham County	60.1	Relatively Low	58.8	83.6	8.2	88.3
Madison County	58.6	Relatively Low	57.8	70.3	9.9	87.6
Valley County	55.6	Relatively Low	55.8	97.5	3.6	66.2
Custer County	52.4	Relatively Low	57.3	87.0	3.0	79.3
Elmore County	52.0	Relatively Low	30.1	97.6	7.1	42.0
Boise County	48.9	Relatively Low	42.9	97.2	4.0	40.0
Twin Falls County	46.9	Relatively Low	51.1	94.0	13.4	74.0
Clearwater County	46.9	Relatively Low	55.7	96.4	3.4	23.0
Owyhee County	44.1	Relatively Low	58.7	95.8	6.2	34.5
Cassia County	43.6	Relatively Low	52.7	94.7	9.8	74.5
Lemhi County	41.4	Very Low	59.8	93.2	3.1	53.5
Jefferson County	40.1	Very Low	37.1	62.5	7.0	80.6
Adams County	39.6	Very Low	35.9	96.7	2.9	37.4
Fremont County	38.3	Very Low	41.4	87.1	6.8	82.9
Gem County	34.4	Very Low	35.7	96.5	5.9	51.0
Latah County	33.3	Very Low	50.4	92.1	9.4	43.6
Nez Perce County	33.0	Very Low	57.7	89.3	7.5	38.3
Washington County	30.3	Very Low	38.2	95.6	5.5	53.8
Teton County	29.5	Very Low	28.0	90.9	10.6	78.3
Boundary County	26.1	Very Low	45.8	80.7	3.5	25.4
Gooding County	25.4	Very Low	25.9	95.3	9.6	58.5
Jerome County	21.5	Very Low	31.1	90.2	9.0	58.7
Minidoka County	20.5	Very Low	32.1	55.3	8.3	74.3
Benewah County	19.9	Very Low	46.9	74.8	5.1	26.4
Payette County	17.1	Very Low	33.9	90.0	6.7	55.9
Power County	16.9	Very Low	7.6	89.0	5.3	58.2
Lincoln County	9.1	Very Low	14.4	92.0	3.9	32.2
Franklin County	7.6	Very Low	17.4	78.8	3.2	70.5
Caribou County	7.2	Very Low	10.7	81.0	3.1	72.1
Bear Lake County	6.6	Very Low	7.2	78.4	2.0	68.9
Camas County	6.0	Very Low	3.4	80.8	1.7	23.2
Butte County	4.4	Very Low	9.1	55.5	3.0	45.9
Lewis County	3.1	Very Low	12.0	85.9	2.8	23.4
Oneida County	1.4	Very Low	4.9	81.2	2.6	39.8
Clark County	0.8	Very Low	2.1	64.7	1.5	30.9

Frequently Asked Questions

How many Idaho county records are included?

RiskByCounty includes 44 Idaho county records from FEMA NRI v1.20 (December 2025).

Which FEMA county ratings appear in Idaho?

FEMA NRI v1.20 (December 2025) county rating counts for Idaho: Very Low: 25; Relatively Low: 17; Relatively Moderate: 2; Relatively High: 0; Very High: 0; Not available: 0.

How complete are the five selected hazard fields for Idaho?

FEMA NRI v1.20 (December 2025) availability among 44 county records: Flood: 44 of 44; Wildfire: 44 of 44; Tornado: 44 of 44; Earthquake: 44 of 44; Hurricane: 0 of 44. 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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