b'T R A N S P O R T A T I O NRailroadsThere are no rail lines in Custer County.Major Interstates/Highways US-93 receives the highest amount of vehicular use and runs north-south through the county, passing through Challis. SH-75 begins its westerly route South of Challis and travels approximately 56 miles West until it reaches Stanley, then about 40 miles South to the Custer County line. Sh-21 (Ponderosa Pine Scenic Byway) runs northwest from Stanley and eventually reaches Boise.Road and Bridge SystemThe US and State of Idaho highways constitute the major arterial network in the County. These major highways are augmented by a vast and intricate system of County collector, local and resource roads, which provide needed access to the bulk of the Countys land base. Custer County Road & Bridge services North Custer County consisting mainly of the Challis area to the Clayton area, and upper and lower Pahsimeroi Valley. The Lost River Highway District has maintenance responsibility of the local roads and bridges within its jurisdiction in southern Custer County. 6Airports Challis Airport (LLJ)Challis Upper Loon Creek Usfs Airport (U72)Challis Twin Bridges Airport (U61)Letchum Copper Basin Airport (0U2)Mackay Lindas Roost Airport (2ID2)Mackay (Private) Mackay Airport (U62)Mackay Star S Ranch Airport (ID56)Mackay (Private) Flying Joseph Ranch Airport (0ID2)May (Private) Silva Ranch Airport (13ID)Stanley (Private) Stanley Airport (2U7)StanleyPublic TransportationLimited passenger service for patients of Valley Vista Care, which is a nursing care organization with a facility near Mackay.350 I D A H O I N F R A S T R U C T U R E G U I D E B O O K'