Twin Falls, Idaho Flood Zones
Twin Falls sits above the Snake River Canyon and faces localized flooding from Rock Creek and Perrine Coulee. Spring snowmelt from the surrounding mountains drives seasonal flood risk.
FEMA Flood Risk Profile: Twin Falls County
Based on FEMA's National Risk Index, which evaluates flood risk at the county level using historical loss data, exposure, and vulnerability.
Inland Flood Risk
Relatively LowEst. annual loss: $7.6M
Source: FEMA National Risk Index, county-level assessment. Individual property risk may vary.
Federal Flood Disaster History: Twin Falls County
Twin Falls County has been included in 2 federal flood-related disaster declarations.
These declarations affected communities across Twin Falls County, including Twin Falls.
Source: OpenFEMA Disaster Declarations Summaries API. Data sourced February 2026.
NFIP Flood Insurance Claims: Twin Falls County
Properties in Twin Falls County have filed 16 NFIP flood insurance claims totaling $25K in payouts since 1978. The average claim payout is $2K.
Highest-Claim Years
1979
4 claims - $5K
1993
2 claims - $1K
2014
2 claims - $6K
Claims by Flood Zone
Zone A
4
Zone AE
4
Zone X
4
Source: OpenFEMA NFIP Claims API. Data sourced February 2026.
Common Flood Zones in Twin Falls
Properties in Twin Falls, ID are commonly designated in these FEMA flood zones:
What Your Flood Zone Means in Twin Falls
Twin Falls faces flood risk primarily from river and stream overflow during heavy rainfall, snowmelt, or upstream dam releases. When rivers exceed their banks, floodwaters spread across low-lying areas mapped in AE and A zones. The most common FEMA flood zone designations in Twin Falls are Zone AE, Zone A, Zone X. FEMA's National Risk Index estimates the county's annual expected loss from inland flooding at over $7.6M.
Riverine flood risk in Twin Falls is driven by the proximity and elevation of properties relative to nearby waterways. Properties closer to rivers with lower ground elevations typically face higher flood insurance premiums under FEMA's Risk Rating 2.0. If your property is in a Special Flood Hazard Area (SFHA) and you have a federally regulated or government-backed mortgage, federal law generally requires your lender to ensure you carry flood insurance.
River flood maps can change when FEMA conducts new Flood Insurance Studies or when development alters drainage patterns. Letters of Map Amendment (LOMA) can remove individual properties if the natural ground elevation was always above the Base Flood Elevation and the property was inadvertently mapped in the SFHA. Use our free lookup tool to check the current flood zone for any Twin Falls address.
Check Your Twin Falls Address
Enter any Twin Falls, ID address to instantly see its FEMA flood zone, risk level, and whether flood insurance is required.
Free Flood Zone LookupTwin Falls, ID Flood Zone FAQ
What flood zones are in Twin Falls, ID?
The most common FEMA flood zones in Twin Falls are Zone AE, Zone A, Zone X. Properties in these high-risk zones (SFHA) may require flood insurance with a federally regulated or government-backed mortgage.
Is flood insurance required in Twin Falls?
If your Twin Falls property is in a Special Flood Hazard Area (SFHA) 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 federally required to carry flood insurance, though coverage is still recommended since about 25% of all NFIP flood claims come from Zone X properties.
How do I check my flood zone in Twin Falls?
Enter your Twin Falls address in the search tool above for an instant flood zone determination. Results include your FEMA flood zone, SFHA status, base flood elevation (if available), and FIRM panel information, pulled directly from FEMA's National Flood Hazard Layer.
What type of flooding affects Twin Falls?
Twin Falls is primarily affected by river and stream overflow during heavy rainfall. The most common FEMA flood zone designations are Zone AE, Zone A, Zone X. Use the free lookup tool above to check the specific flood zone for any Twin Falls address.
Has Twin Falls experienced major flooding events?
Twin Falls County, where Twin Falls is located, has been part of 2 federal disaster declarations for flooding, hurricanes, or severe storms. The most recent was Severe Winter Storms and Flooding in 2017. Federal disaster declarations are issued when flooding overwhelms local resources and triggers FEMA assistance programs.
How many flood insurance claims have been filed in Twin Falls?
Twin Falls County has recorded 16 NFIP flood insurance claims totaling $25K in payouts since 1978. The year with the most claims was 1979, with 4 claims and $5K in payouts. These figures cover all NFIP claims in the county, including Twin Falls.
Sources
This page summarizes information from FEMA and other official resources in plain language. For full technical details, see the links below.
- FEMA National Flood Hazard LayerDirect Source
The NFHL is the source of all flood zone data shown on this page.
- FEMA Map Service Center — Search by AddressDirect Source
Look up any address to view FIRM panels, FIS reports, and LOMCs.
- NFHL Data and Map StatusTopic Page
View NFHL coverage and data freshness by state and community.
- FEMA National Risk Index — Data ResourcesDirect Source
County-level risk scores for inland flooding, coastal flooding, and hurricane used in the Flood Risk Profile.
- OpenFEMA Disaster Declarations Summaries API v2Direct Source
Federal disaster declarations filtered for flood-related incident types (Flood, Hurricane, Severe Storm, Coastal Storm).
- OpenFEMA FIMA NFIP Claims API v2Direct Source
Historical NFIP flood insurance claims since 1978, aggregated by county and state. Includes claim counts, payouts, and flood zone breakdowns.
Sources last verified: February 2026