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1958 Map of Detert Reservoir

Name: 1958 Topographic Map of Detert Reservoir
Creator: U.S. Geological Survey
Published: 1980
License: https://creativecommons.org/publicdomain/mark/1.0/

USGS Topo · Published 1980

About this map

Collayomi Valley and the northern reaches of the Mayacamas Mountains define this section of the California Coast Ranges as it appeared during the late 1950s, with updates reflecting the late 1970s. The map illustrates a landscape shaped by cinnabar and mercury mining, with several operations such as the Mirabel Mine, Silverado Mine, and Oat Hill Extension Mine scattered throughout the rugged ridges. These mines, many of which are situated near the boundary between Lake and Napa counties, are connected by historical routes like the Toll House Road and the Calistoga Grade.

The presence of the Robert Louis Stevenson Memorial State Park marks the southern portion of the quadrangle, preserving the terrain surrounding Table Rock. In the north, the small settlement of Middletown sits at the valley floor, while the Detert Reservoir provides a primary water feature. From the high points at Snelly Peak to the deep cut of Swartz Canyon, the topography reveals a remote region of complex canyons and isolated peaks.