Reference only. Data sourced from HUD/FHFA (2025). This site is a private entity and not affiliated with any government agency.
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Flood risk by county

National Risk Index scores attached to every county calculator.

CountyRiskScoreDetails
Ada CountyLow28View
Adams CountyVery High98View
Bannock CountyHigh77View
Bear Lake CountyVery High98View
Benewah CountyVery High98View
Bingham CountyLow27View
Blaine CountyModerate50View
Boise CountyLow28View
Bonner CountyVery High83View
Bonneville CountyModerate53View
Boundary CountyVery High98View
Butte CountyModerate53View
Camas CountyModerate50View
Canyon CountyLow28View
Caribou CountyVery High98View
Cassia CountyModerate30View
Clark CountyVery High98View
Clearwater CountyVery High98View
Custer CountyVery High98View
Elmore CountyHigh68View
Franklin CountyHigh61View
Fremont CountyHigh79View
Gem CountyLow28View
Gooding CountyVery High98View
Idaho CountyVery High98View
Jefferson CountyModerate53View
Jerome CountyVery High92View
Kootenai CountyModerate35View
Latah CountyHigh68View
Lemhi CountyVery High98View
Lewis CountyVery High98View
Lincoln CountyVery High98View
Madison CountyHigh79View
Minidoka CountyModerate30View
Nez Perce CountyHigh60View
Oneida CountyVery High98View
Owyhee CountyLow28View
Payette CountyHigh73View
Power CountyHigh77View
Shoshone CountyVery High98View
Teton CountyModerate54View
Twin Falls CountyVery High92View
Valley CountyVery High98View
Washington CountyVery High98View