Idaho Flood Zone Map
Last updated: August 2026
Idaho faces flooding primarily from spring snowmelt in mountain river systems including the Snake, Boise, and Salmon rivers. Rain-on-snow events can cause rapid flooding, and steep terrain creates flash flood and debris flow hazards in mountain valleys.
8 communities participate in FEMA's Community Rating System, qualifying residents for flood insurance discounts of up to 15%.
Idaho has recorded 1,116 NFIP flood insurance claims since 1978, totaling $10.4M in payouts. See how Idaho compares in our nationwide NFIP claims data breakdown.
FEMA Region
Region 10
Also covers Alaska, Oregon, Washington
NFIP Policies
5,474
Policies effective in the trailing 13 months (July 1, 2025 - August 16, 2026), not a certified point-in-time count
ID Avg. Premium
$974/yr
National average: $915/yr
NFIP Flood Insurance Claims
Idaho properties have filed 1,116 NFIP flood insurance claims totaling $10.4M in payouts since 1978. The average claim payout in 2025 was $7,500.
Recent Years
Claims by Decade
Highest-Claim Years
Claims by Flood Zone
Source: OpenFEMA NFIP Claims API. Data sourced August 2026. See national claims data.
Flood Insurance Coverage in Idaho
Only roughly 1 in 133 households in Idaho carries NFIP flood insurance (0.8% of estimated households). 34 of 44 counties have elevated flood risk but low insurance coverage. With 722 recorded flood events and $141.6M in damage, many flood losses in this state are likely uninsured.
Penetration Rate
0.8%
roughly 1 in 133 households
Historical Claims Ratio
1 in 5
1,116 claims over 45+ years across 5,474 current policies
Avg. Claim Payout
$9,347
Per claim, state-wide since 1978
Historically, Idaho has averaged 1 claim for every 5 active policies (since 1978). This compares cumulative claims against today's policy count and does not predict future claim likelihood.
Coverage data: NFIP policies as of August 2026, claims since 1978 (August 2026), population from FEMA NRI.
Repetitive Loss Properties in Idaho
Idaho has 38 properties with multiple flood insurance losses, including 2 severe repetitive loss properties. 1 properties have received FEMA mitigation funding. Severe repetitive loss is a subset of multiple loss, not a separate count. Data sourced August 2026.
Multiple Loss
38
2+ claims within 10 years
Severe Repetitive Loss
2
4+ claims or 2 exceeding value
Mitigated
1
Received FEMA mitigation
By Flood Zone
Zone data available for 37 of 38 properties.
Source: OpenFEMA NFIP Multiple Loss Properties. Data sourced August 2026.
Flood Insurance Discounts in Idaho
8 Idaho communities participate in FEMA's Community Rating System (CRS), earning flood insurance premium discounts for residents in Special Flood Hazard Areas. CRS classes in Idaho range from 7 to 9, with discounts from 5% to 15%.
Class 7 - 15% discount
Class 7 - 15% discount
Class 7 - 15% discount
Kootenai County
Class 7 - 15% discount
Class 8 - 10% discount
Class 8 - 10% discount
Ada County
Class 8 - 10% discount
Gem County
Class 9 - 5% discount
Source: FEMA Community Rating System, April 2026. Discounts apply to NFIP policies only. CRS classes and discounts are subject to change.
Federal Flood Disaster History
Idaho has received 19 federal disaster declarations for flooding, hurricanes, severe storms, and coastal storms.
Declarations by Decade
Recent Declarations
Showing 8 most recent of 19 total declarations.
Source: OpenFEMA Disaster Declarations Summaries API. Data sourced August 2026.
Recorded Flood Events in Idaho
NOAA has recorded 722 flood events in Idaho since 1996, causing an estimated $141.6M in property and crop damage and 3 deaths.
Total Events
722
Total Damage
$141.6M
Fatalities
3
Events by Decade
Costliest Events
Source: NOAA Storm Events Database, 1996-2026. Data sourced August 2026.
Flood Mitigation in Idaho
FEMA has funded mitigation for 694 properties in Idaho, investing $11.8M in flood risk reduction. Common mitigation actions include acquisition (buying and demolishing flood-prone structures), elevation (raising buildings above flood level), and safe rooms (wind/storm shelters for tornado and hurricane protection).
Properties by Action
Mitigation by Decade
Source: OpenFEMA Hazard Mitigation Assistance Mitigated Properties. Data sourced August 2026. FEMA records a total payment per grant rather than per property, so the dollar figure is an estimate that splits each grant across the properties it covers; the property count is exact.
Levee Protection in Idaho
The USACE National Levee Database lists 7 levee systems protecting parts of 3 Idaho cities. A system's FEMA accreditation status determines how its protected area is mapped - accredited levees are typically mapped as Zone X, while non-accredited or provisionally accredited (PAL) systems generally leave their protected area in the SFHA.
By Accreditation Status
Largest Protected Areas
Pocatello 2 (Right Bank - Upper)
AccreditedProtects: Pocatello - Flood source: Portneuf - 0.59 sq mi
Pocatello 1 (Left Bank - Upper)
AccreditedProtects: Pocatello - Flood source: Portneuf - 0.43 sq mi
Pocatello 4 (Left Bank - Lower)
Non-AccreditedProtects: Pocatello - Flood source: Portneuf - 0.21 sq mi
Fairgrounds
Non-AccreditedProtects: Garden City - Flood source: Boise - 0.18 sq mi
Pocatello 5 (Right Bank - Lower)
AccreditedProtects: Pocatello - 0.08 sq mi
Pocatello 3 (Left Bank - Middle)
Non-AccreditedProtects: Pocatello - Flood source: Portneuf - 0.08 sq mi
...and 1 more system tracked in the database.
Source: USACE National Levee Database. Data sourced August 2026. Learn how levees affect flood zone mapping.
Idaho Flood Risk Overview
County-level risk ratings from FEMA's National Risk Index across 44 Idaho counties.
Inland Flood Risk
0 of 44 counties rated high or very high
Source: FEMA National Risk Index, county-level assessment.
Idaho Cities
Explore flood zone information for major cities in Idaho.
Idaho Flood Zone FAQ
How do I check if my Idaho property is in a flood zone?
Enter your ID address in FludZone's free lookup tool. We query FEMA's National Flood Hazard Layer in real-time to show your flood zone designation, whether flood insurance is required, and your property's risk level.
Do I need flood insurance in Idaho?
If your Idaho property is in a Special Flood Hazard Area (SFHA), meaning zones starting with A or V, and you have a federally regulated or government-backed mortgage, federal law generally requires your lender to ensure you carry flood insurance. Properties in Zone X are not subject to the federal mandate but lenders may still require coverage, and it is often recommended given Idaho's flood history.
What are the most common flood zones in Idaho?
The most common FEMA flood zone designations in Idaho are Zone AE, Zone A, Zone X. Each zone reflects a different level of flood risk, from high-risk areas where flood insurance is generally required for federally regulated or government-backed mortgages to lower-risk areas where coverage is optional but recommended.
Can I remove my Idaho property from a flood zone?
Yes, if your Idaho property's natural ground elevation was always above the Base Flood Elevation and FEMA inadvertently mapped it in the SFHA, you can apply for a Letter of Map Amendment (LOMA) through FEMA. For properties in Idaho's AE and A zones, the LOMA process is relatively straightforward when the elevation data supports it. If your property was raised above the BFE with fill, the process is a LOMR-F. A successful LOMA generally removes the federal mandatory flood insurance requirement, but your lender may still choose to require coverage. You'll need an elevation certificate from a licensed surveyor.
Do any Idaho communities offer flood insurance discounts?
Yes, 8 Idaho communities participate in FEMA's Community Rating System (CRS), a voluntary program that rewards communities for exceeding minimum flood mitigation standards. Residents in participating communities can receive NFIP premium discounts of up to 15% in the Special Flood Hazard Area. Properties outside the SFHA also benefit: CRS classes 1 through 6 receive a 10% discount, and classes 7 through 9 receive a 5% discount on NFIP premiums. Check your city's page on FludZone to see if your community participates.
How much does flood insurance cost in Idaho?
The average NFIP flood insurance premium in Idaho is $974 per year across 5,474 active policies. Premiums vary by zone: Zone AE policies average $1,014/yr. Under FEMA's Risk Rating 2.0, your specific premium depends on property type, elevation relative to the Base Flood Elevation, and distance to water, not just your flood zone designation.
How many NFIP flood insurance claims has Idaho had?
Idaho has recorded 1,116 NFIP flood insurance claims totaling $10.4M in payouts since 1978. The highest-claim year was 2017, with 237 claims and $3.4M in payouts. This history reflects cumulative flood damage to Idaho properties across decades of storm and rainfall events.
How many Idaho properties have flooded repeatedly?
Idaho has 38 properties with multiple flood losses. Of these, 2 are classified as Severe Repetitive Loss, meaning they have experienced four or more NFIP claims of $5,000 or more, or two or more claims where the total exceeds the building value. 1 of these properties have been mitigated.
What percentage of Idaho homes have flood insurance?
Only roughly 1 in 133 households in Idaho carries NFIP flood insurance (0.8% of estimated households). 34 counties in Idaho have elevated flood risk but low insurance coverage, indicating a significant protection gap.
Are there levees protecting Idaho cities?
Yes. The USACE National Levee Database lists 7 levee systems protecting parts of 3 Idaho cities. 3 are FEMA-accredited (generally mapped as Zone X), 4 are non-accredited (the protected area stays in the SFHA), and 0 are provisionally accredited (PAL, accreditation in progress). Levee protection is system-specific, not citywide - check a specific city's page or use the address search above for the zone at a specific property.
Understanding Flood Zones
Learn more about the FEMA flood zone designations common in Idaho.
See the Flood Map for Any Idaho Address
Enter a ID address to view its FEMA flood map, zone designation, SFHA status, and insurance requirements.
Disclaimer: Flood risk data on this page is sourced from FEMA datasets including the National Risk Index, NFIP claims and policy records, disaster declarations, and the Community Rating System. These datasets were last extracted on August 2026 and may not reflect the most recent changes. Always verify current flood zone status through FEMA or a licensed determination provider before making property, insurance, or lending decisions.