Butte County UV ForecastUnited StatesSDButte CountyModerate3.8Belle FourcheModerate UV, 3.8Moderate4Castle RockModerate UV, 4ArpanBelle FourcheBelle Fourche Municipal AirportBelle Fourche National Wildlife RefugeBelle Fourche ReservoirCastle RockFruitdaleGuidinger ReservoirHerman ParkHighland ParkHooverNewellNewell LakeNislandRocky Point Recreation AreaVale