1955 Map of Isabel Valley

About this map

The University of California Lick Observatory borders the western edge of this mid-century topographic survey, looking out over the drainage basins of the Diablo Range. This high-country landscape is defined by the broad Isabel Valley, where an unimproved landing strip and several small reservoirs signify the cattle ranching and aviation footprint of the era. The terrain is marked by significant peaks, including Mt Isabel and Mt Helen, situated among a network of family-named landmarks like Jays Ridge and Bollinger Mtn. Water distribution remains the central theme of the geography, with Isabel Creek winding through the valley floor and Coyote Creek cutting through the southern canyons. Local history researchers will find a complex web of trails and primitive roads such as Arroyo Road and Ridge Trail, tracing the movement of people across the Los Huecos land grant.