2020 Map of Chalk Hills

About this map

Chalk Hills rises as the central landform of this Owyhee County terrain, defined by a network of seasonal drainages and high desert ranching roads. The landscape is carved by deep incisions like Twentymile Gulch and Waterspout Draw, which channel runoff toward the primary creek systems. Water management and livestock movement dominate the geography, evidenced by labels such as Cattle Dr and the intersection of Shoofly Rd and Shoofly Cutoff Rd. These routes provide access to the remote basins of Little Jacks Cr and Big Jacks Cr. The drainage pattern of Shoofly Cr and Poison Cr illustrates the erosional forces that have shaped this portion of the Idaho high desert, where limited reliable water sources dictate the placement of local thoroughfares like Mud Flat Rd.