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2015 Map of Larkspur Hills

Name: 2015 Topographic Map of Larkspur Hills
Creator: U.S. Geological Survey
Published: 2015
License: https://creativecommons.org/publicdomain/mark/1.0/

USGS Topo · Published 2015

About this map

Surprise Valley defines the western edge of this Modoc County landscape, where the basin floor meets the rising elevations of the Larkspur Hills. This high-desert terrain is marked by a complex hydrological network of ephemeral and perennial water sources, including the expansive Upper Lake and smaller catchments like Big Mud Lake and Little Mud Lake. The importance of water management in this arid region is visible through the Fee Reservoir and the naming of local landmarks such as Conlan Spring and Poison Springs.

Canyons like Lieberman Canyon and Polson Springs Canyon cut through the hills, providing drainage for seasonal flows such as Schamp Cr and First Cr. Transportation is limited to a few established routes, including Barrel Springs Rd and CO Road 6, which connect the remote valley floor to the higher reaches of the plateau. The map captures a section of the Great Basin's rugged interior, illustrating how terrain and water access dictate the footprint of human infrastructure in northeastern California.