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1945 Map of Lower Lake

Name: 1945 Topographic Map of Lower Lake
Creator: U.S. Geological Survey
Published: 1947
License: https://creativecommons.org/publicdomain/mark/1.0/

USGS Topo · Published 1947

About this map

The southern shores of Clear Lake and the geothermal activity of the Coast Ranges dominate this 1943 survey. The landscape is dotted with resort settlements and mineral spas that defined the era's local economy, including Seigler Mtn Springs, Harbin Springs, and Ettawa Springs. These sites, along with Hobergs and Adams, illustrate a transition from pioneer ranching to a specialized recreation industry centered on the region's volcanic geology.

Industrial activity is noted through scattered mining operations such as the Big Chief Mine and the Weiper Mine, while the infrastructure of the Clear Lake Water Co Dam on Cache Creek manages the outflow from the lake. From the valley floor at Middletown to the heights of Cobb Mountain, the map reveals a network of mountain roads connecting remote landings like Browns Ldg and small rural education centers such as Cobb Valley Sch.