1967 Map of Castle Rocks

About this map

West Pryor Mountain dominates this Big Horn County landscape, situated entirely within the boundary of the Crow Indian Reservation. The terrain is characterized by dramatic elevation changes, notably the pass at Pryor Gap and the namesake formations of Castle Rocks. A legacy of earlier transportation is visible in the Old Railroad Grade, which winds through the mountain passes near a designated Tunnel. Geologic interest is high throughout this 1967 field survey, which identifies subterranean features like Pryor Creek Cave and Summit Creek Cavern. Hydrology is defined by several seasonal water sources, including Bird Creek and Pryor Creek, alongside man-made infrastructure like a prominent Pipeline and Ditch. A Lookout Tower and Picnic Area suggest the mid-century recreational and administrative use of this high-altitude territory.