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1958 Map of Detert Reservoir

Name: 1958 Topographic Map of Detert Reservoir
Creator: U.S. Geological Survey
Published: 1964
License: https://creativecommons.org/publicdomain/mark/1.0/

USGS Topo · Published 1964

About this map

Middletown Rancheria sits at the northern edge of this landscape, where the Collayomi Valley meets the high, complex ridges of the Mayacamas Mountains. The mid-century terrain is defined by a dense concentration of mercury and silver mining history, with numerous operations such as the Mirabel Mine, Silverado Mine, and the Oat Hill Mine dotting the slopes. This mineral wealth is situated within a dramatic physical setting including The Palisades and Table Mountain.

Cultural and conservation landmarks are prominent, notably the Robert Louis Stevenson Memorial State Park and the Radio Relay Station on the ridge. The hydrology of the region is mapped in detail, from the Detert Reservoir and its spillway to the headwaters of St Helena Creek and James Creek. This 1958 survey captures the intersection of industrial extraction and early wilderness preservation in the highlands of Lake and Napa counties.