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1958 Map of Detert Reservoir

Name: 1958 Topographic Map of Detert Reservoir
Creator: U.S. Geological Survey
Published: 1987
License: https://creativecommons.org/publicdomain/mark/1.0/

USGS Topo · Published 1987

About this map

Mallacomes Or Moristul Y Plan De Agua Caliente reveals the complex Mexican land grant history underlying this portion of Lake, Napa, and Sonoma Counties. The landscape is defined by the high elevations of the Mayacmas Mountains, where the Robert Louis Stevenson Memorial State Park now preserves the area surrounding Table Rock and the steep slopes of The Palisades.

Mineral extraction dominates the historic land use, with a dense concentration of quicksilver and cinnabar mines such as the Oat Hill Mine, Silverado Mine, and Mirabel Mine scattered along the ridges. These industrial sites are linked by early routes like the Toll House Road and Western Mine Rd, which serviced the rugged interior between Middletown and the volcanic heights of Oat Hill. The topography transitions from the alluvial Collayomi Valley in the northwest to the engineered Detert Reservoir near Guenoc, illustrating the region's shift toward water management alongside its mining legacy.