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1968 Map of Mt. Harlan

Name: 1968 Topographic Map of Mt. Harlan
Creator: U.S. Geological Survey
Published: 1984
License: https://creativecommons.org/publicdomain/mark/1.0/

USGS Topo · Published 1984

About this map

The San Andreas Rift Zone cuts across the northeastern corner of this terrain, marking the profound geological boundary that shapes the Gabilan Range. This late-1960s survey, updated in the early 1980s, reveals a landscape dominated by high ridges and deep drainages like Pescadero Creek and Long Gulch. Human presence is sparse and concentrated around resource extraction and cattle ranching, indicated by several quarries and the remote Thompson Cabin located south of Round Spring Valley.

The southwestern portion of the sheet is defined by the historic Mexican land grant Encinal y Buena Esperanza, illustrating how colonial-era boundaries persisted into modern property lines. Dozens of isolated water sources such as Horseshoe Spring and various unnamed springs are mapped throughout the canyons, essential for the livestock that grazed these slopes. High points like Mt Harlan and Bluerock Mtn provide clear landmarks for navigating the complex network of unnamed trails and jeep tracks that weave through the canyons.