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
Aurora CountyVery High98View
Beadle CountyModerate53View
Bennett CountyVery High98View
Bon Homme CountyVery High98View
Brookings CountyModerate30View
Brown CountyLow20View
Brule CountyVery High98View
Buffalo CountyVery High98View
Butte CountyVery High98View
Campbell CountyVery High98View
Charles Mix CountyVery High98View
Clark CountyVery High98View
Clay CountyVery High93View
Codington CountyVery High95View
Corson CountyVery High98View
Custer CountyVery High98View
Davison CountyHigh67View
Day CountyVery High98View
Deuel CountyVery High98View
Dewey CountyVery High98View
Douglas CountyVery High98View
Edmunds CountyLow20View
Fall River CountyVery High98View
Faulk CountyVery High98View
Grant CountyVery High98View
Gregory CountyVery High98View
Haakon CountyVery High98View
Hamlin CountyVery High95View
Hand CountyVery High98View
Hanson CountyHigh67View
Harding CountyVery High98View
Hughes CountyHigh76View
Hutchinson CountyVery High98View
Hyde CountyVery High98View
Jackson CountyVery High98View
Jerauld CountyModerate53View
Jones CountyVery High98View
Kingsbury CountyVery High98View
Lake CountyVery High98View
Lawrence CountyVery High87View
Lincoln CountyVery High87View
Lyman CountyVery High98View
Marshall CountyVery High98View
Mccook CountyVery High87View
Mcpherson CountyVery High98View
Meade CountyHigh79View
Mellette CountyVery High98View
Miner CountyVery High98View
Minnehaha CountyVery High87View
Moody CountyVery High98View
Oglala Lakota CountyVery High98View
Pennington CountyHigh79View
Perkins CountyVery High98View
Potter CountyVery High98View
Roberts CountyVery High98View
Sanborn CountyVery High98View
Spink CountyVery High98View
Stanley CountyHigh76View
Sully CountyVery High98View
Todd CountyVery High98View
Tripp CountyVery High98View
Turner CountyVery High87View
Union CountyVery High87View
Walworth CountyVery High98View
Yankton CountyVery High98View
Ziebach CountyVery High98View