2015 Map of Holbrook Canyon

About this map

Nelson Corral Reservoir sits as a central water feature in this high-elevation landscape of Lassen County, where the topography transitions from the open Madeline Plains to the south into complex canyon systems. The map details a network of named water sources essential for life in this arid region, including Nelson Spring, Bill Allen Spring, and Clover Springs. Early infrastructure is documented through a series of primitive roads and trails like Ash Valley Rd, Mesquite Trl, and Mahogany Trl that wind through Holbrook Canyon and Anderson Canyon. This survey illustrates the vital importance of water management in the California backcountry, with several man-made catchments such as Holbrook Reservoir and Spooner Reservoir positioned to capture seasonal runoff across Harter Flat and Sagebrush Flat.