1993 Map of Graven Ridge

About this map

Graven Ridge dominates this northern California landscape, which was revised by the U.S. Forest Service in the early 1990s. The area is characterized by a complex network of upland water management and seasonal grazing grounds, centered on significant catchments like Graves Reservoir, Graven Reservoir, and Bayley Reservoir. These water sources are vital to the high-country ecology and the managed lands of the Modoc National Forest. Geologically, the terrain transitions from the high elevations of Portuguese Ridge down toward the wide expanse of Rocky Prairie. The map captures an environment defined by its hydrology, including numerous named seeps such as Arnett Spring and Higgins Spring, alongside intermittent drainages like Hilton Creek. The prevalence of four-wheel-drive tracks suggests a landscape primarily accessed for forestry operations and seasonal resource management rather than permanent settlement.