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2018 Map of Three Sisters

Name: 2018 Topographic Map of Three Sisters
Creator: U.S. Geological Survey
Published: 2018
License: https://creativecommons.org/publicdomain/mark/1.0/

USGS Topo · Published 2018

About this map

The Diablo Range defines the high-relief landscape of this 2018 survey, centered on the boundary between Santa Clara Co and San Benito Co. Prominent summits including Three Sisters, San Joaquin Peak, and Santa Ana Mtn rise sharply above the intricate canyon systems of Harper Canyon and Little Peak Canyon. The drainage patterns are dominated by seasonal watercourses such as Arroyo De Las Viboras and Arroyo Dos Picachos, which flow toward the more settled valley floor.

Lower-elevation areas show a transition from the wilder ridgelines of Dunne Ridge and Chimney Ridge to a network of rural roads. Names such as Los Viboras Rd, Spring Grove Rd, and Lone Tree Rd indicate early ranching and agricultural access points. The presence of Hawkins Lake provides a localized water source in an otherwise arid upland environment, illustrating the water management necessary for this part of the California Coast Ranges.