2013 Map of Casto

About this map

Loon Cr and its numerous tributaries dominate this high-elevation landscape within the Challis National Forest in Custer County. In 2013, the region remained primarily defined by its drainage basins and isolated outposts like Casto and Boyle Ranch. The map reveals a specialized infrastructure suited for backcountry access, notably the Upper Loon Creek USFS Airport and several remote campsites including Tincup Campground and the Phillips Creek Transfer Campground. Transportation is restricted to the winding Loon Creek Rd, which tracks the water through narrow valleys such as Packer Gulch. The dense network of named streams, from Salt Cr to Mayfield Cr, reflects a landscape where water and topography dictate the limited human footprint of forest service operations and private ranching.