1955 Map of Eylar Mountain

About this map

Eylar Mtn dominates this mid-1950s survey of the Diablo Range, where the boundary between Alameda and Santa Clara counties cuts through a landscape defined by deep canyons and seasonal camps. This area served as a remote outpost for surveyors and miners, evidenced by scattered Mines and a Prospect near Mill Gulch. Small, named encampments like Hays Camp, Mowry Camp, and Camp Bessie suggest a history of seasonal occupation or labor in these highlands. The complex drainage network is anchored by Arroyo Mocho, Arroyo Valle, and Arroyo San Antonio, which have carved out distinct features like The Narrows and Sulphur Gulch. A network of Jeep Trails provides the primary access through the Burnt Hills and over high points such as Beartrap Ridge and Pino Ridge, reflecting the area's limited development and its focus on resource extraction and livestock grazing.