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Natural Hazard Risk in South Dakota

The risk score (0–100) combines expected annual loss from 18 natural hazards with social vulnerability and community resilience. Higher = greater relative risk. Scores compare counties across the United States.

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CountyRisk scoreRatingExpected annual lossPopulation
Minnehaha89.5Relatively Moderate$103.7M196,891
Dewey78.7Relatively Low$22.1M5,228
Pennington78.6Relatively Low$40.8M109,015
Brown73.5Relatively Low$36.6M38,265
Yankton63.4Relatively Low$19.4M23,308
Lincoln63Relatively Low$41.7M65,123
Codington61.8Relatively Low$24.9M28,315
Brule58.7Relatively Low$19.2M5,033
Brookings50.1Relatively Low$23.8M34,375
Oglala Lakota49.8Relatively Low$8.5M13,666
Meade49.5Relatively Low$21.7M29,730
Lawrence49.3Relatively Low$16.1M25,743
Charles Mix48.5Relatively Low$13.2M9,373
Hutchinson47.9Relatively Low$18.8M7,420
Beadle47.1Relatively Low$16.4M19,129
McCook43.4Relatively Low$21.4M5,682
Walworth39.5Very Low$10.2M5,315
Davison39.2Very Low$13.2M19,950
Corson38.1Very Low$7.1M3,902
Roberts37.8Very Low$8.6M10,217
Union37.1Very Low$16.3M16,799
Todd36.6Very Low$6.2M9,304
Tripp36.5Very Low$8.3M5,612
Lake32.6Very Low$11.7M11,059
Fall River30.9Very Low$6.8M6,903
Day27.6Very Low$7.2M5,449
Moody26.9Very Low$8.8M6,336
Lyman26.5Very Low$5.9M3,715
Ziebach25.2Very Low$4.5M2,413
Turner24Very Low$10.7M8,673
Butte23.3Very Low$8.1M10,241
Clay20.5Very Low$11.6M14,967
Aurora19.6Very Low$8.1M2,747
Grant18.9Very Low$10.7M7,556
Spink17.7Very Low$9.7M6,353
Hughes16.5Very Low$9.9M17,751
Custer16.3Very Low$8.8M8,303
Gregory16.2Very Low$7.5M3,989
Hanson14.8Very Low$4.3M3,461
Marshall14.5Very Low$6M4,275
Buffalo13.7Very Low$4.2M1,948
McPherson11.1Very Low$3.7M2,411
Bon Homme10.8Very Low$7.2M6,996
Douglas10.4Very Low$6M2,834
Jackson10.2Very Low$2.6M2,801
Potter10Very Low$5.4M2,466
Hamlin10Very Low$7M6,164
Haakon9.7Very Low$4.3M1,867
Jerauld9.5Very Low$4.3M1,663
Faulk8Very Low$2.7M2,125
Kingsbury7.9Very Low$6.7M5,183
Edmunds7Very Low$5.3M3,952
Deuel6.9Very Low$5.5M4,285
Hyde6.5Very Low$2.7M1,257
Hand6.5Very Low$4.4M3,140
Sully6.3Very Low$5.2M1,446
Bennett5.9Very Low$1.9M3,380
Mellette5.2Very Low$1.9M1,879
Stanley5.1Very Low$4.3M2,972
Clark4.5Very Low$4.2M3,828
Campbell4.4Very Low$4.3M1,375
Sanborn3.6Very Low$3.8M2,329
Miner3.4Very Low$4.7M2,298
Perkins2.6Very Low$3.1M2,834
Harding1.5Very Low$2.3M1,311
Jones1.3Very Low$2.1M917

🏛️ Federal disaster declarations (last 2 years)

DRSTRAIGHT-LINE WINDSApr 7, 2026

Straight-Line Winds · Designated areas: Pennington (County), Fall River (County), Custer (County)

FMQURY FIREMar 13, 2026

Fire · Designated areas: Custer (County)

DRSEVERE STORM AND FLOODINGSep 11, 2025

Flood · Designated areas: Lake Traverse (Sisseton) Indian Reservation

DRSEVERE STORM, STRAIGHT-LINE WINDS, AND FLOODINGNov 1, 2024

Severe Storm · Designated areas: Cheyenne River Indian Reservation

DRSEVERE STORMS, STRAIGHT-LINE WINDS, AND FLOODINGAug 15, 2024

Flood · Designated areas: Buffalo (County), Charles Mix (County), Clay (County), Douglas (County), Gregory (County), Hand (County), Hanson (County), Hutchinson (County), Jackson (County), Lake (County), McCook (County), Miner (County)…

Major disaster (DR) and emergency (EM) declarations unlock federal assistance for the designated areas. Source: FEMA / OpenFEMA.

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Data: FEMA National Risk Index (updated ~annually). AlertAtlas is not an official warning service — always follow local authorities.