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1955 Map of Eylar Mtn

Name: 1955 Topographic Map of Eylar Mtn
Creator: U.S. Geological Survey
Published: 1972
License: https://creativecommons.org/publicdomain/mark/1.0/

USGS Topo · Published 1972

About this map

Eylar Mountain dominates the high ground of the Diablo Range along the border of Alameda and Santa Clara counties in the mid-1950s. The landscape is defined by a dense network of canyons and ridges, where seasonal drainages like Arroyo Valle and Arroyo Mocho carve through the Burnt Hills. Small outposts and seasonal sites such as Hays Camp, Mowry Camp, and Camp Bessie suggest a history of ranching or early recreational use in this isolated terrain.

A network of unimproved routes, including the Ridge Trail and various Jeep Trails, provides the only access through steep features like Packard Ridge and Lamb Ridge. The topography is particularly striking at The Narrows along the Valle, while place names like Coffey Mill Gulch hint at early industry or family homesteads. This document captures the area before modern infrastructure reached deep into these drainages, preserving the locations of springs and named flats like Strawberry Flat and Ingram Flat.