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2017 Map of Calderwood Reservoir

Name: 2017 Topographic Map of Calderwood Reservoir
Creator: U.S. Geological Survey
Published: 2017
License: https://creativecommons.org/publicdomain/mark/1.0/

USGS Topo · Published 2017

About this map

Warner Valley defines the western half of this landscape, characterized by a complex network of wetlands and shallow water bodies including Crump Lake, Pelican Lake, and Fisher Lake. The terrain transitions sharply to the east, where steep contours rise toward the high plateau containing Calderwood Reservoir. This hydraulic system is critical to the arid region, with Greaser Slough and Twentymile Slough connecting various catchments like Greaser Reservoir and Greaser Lake.

Infrastructure is sparse, centered primarily on the path of Highway 140 as it skirts the southern edge of the valley. The map documents a rugged terminal basin where drainages like Deep Cr and Fish Cr descend from the eastern heights into the marshy valley floor. This 2017 U.S. Geological Survey update provides an essential record of water management and topography in a remote section of Lake County.