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
Beaverhead CountyVery High98View
Big Horn CountyVery High98View
Blaine CountyVery High98View
Broadwater CountyVery High98View
Carbon CountyLow27View
Carter CountyVery High98View
Cascade CountyModerate49View
Chouteau CountyVery High98View
Custer CountyVery High98View
Daniels CountyVery High98View
Dawson CountyVery High98View
Deer Lodge CountyVery High98View
Fallon CountyVery High98View
Fergus CountyVery High98View
Flathead CountyHigh56View
Gallatin CountyLow29View
Garfield CountyVery High98View
Glacier CountyVery High98View
Golden Valley CountyVery High98View
Granite CountyVery High98View
Hill CountyVery High98View
Jefferson CountyModerate51View
Judith Basin CountyVery High98View
Lake CountyVery High98View
Lewis And Clark CountyModerate51View
Liberty CountyVery High98View
Lincoln CountyVery High98View
Madison CountyVery High98View
Mccone CountyVery High98View
Meagher CountyVery High98View
Mineral CountyVery High98View
Missoula CountyHigh67View
Musselshell CountyVery High98View
Park CountyVery High98View
Petroleum CountyVery High98View
Phillips CountyVery High98View
Pondera CountyVery High98View
Powder River CountyVery High98View
Powell CountyVery High98View
Prairie CountyVery High98View
Ravalli CountyVery High98View
Richland CountyVery High98View
Roosevelt CountyVery High98View
Rosebud CountyVery High98View
Sanders CountyVery High98View
Sheridan CountyVery High98View
Silver Bow CountyModerate31View
Stillwater CountyLow27View
Sweet Grass CountyVery High98View
Teton CountyVery High98View
Toole CountyVery High98View
Treasure CountyVery High98View
Valley CountyVery High98View
Wheatland CountyVery High98View
Wibaux CountyVery High98View
Yellowstone CountyLow27View