1981 Map of Rattlesnake Hills

About this map

Rattlesnake Hills and the Granite Mountains dominate this high-desert landscape across the Fremont and Natrona County line. The terrain is defined by the massive drainage systems of the Sweetwater River and the South Fork Powder River, separated by the prominent Beaver Divide. This 1981 compilation, drawing on data back to the 1950s, highlights the isolation of central Wyoming, where the industrial presence at Lucky Mac Camp and scattered mines contrast with the natural expanses of the Pathfinder National Wildlife Refuge. Regional hydrology is notably diverse, ranging from the vast Pathfinder Reservoir to seasonal features like Buffalo Wallows, The Dry Lake, and Soda Lakes. Distinctive basins such as Ervay Basin and Keester Basin sit tucked between ridges like Signor Ridge, illustrating the complex geological folds of the Wyoming interior.