1942 Map of Mt. Hamilton

About this map

Mt Hamilton and the world-renowned Lick Observatory crown this rugged section of the Diablo Range during the early 1940s. The landscape is defined by its massive Spanish-era land grants, including Rancho Canada de los Pala and Rancho Yerba Buena, which preserved large-scale ranching operations long after the California statehood transition. These holdings are dotted with family outposts like the Grant Ranch, Evergreen Ranch, and Hendricks Ranch, illustrating the sparse but established settlement patterns of Santa Clara County's interior. Narrow roads wind through high-elevation terrain between Copernicus Pk and Mt Isabel, connecting the scientific community at the summit to distant valley floor settlements. The mapping of Isabel Valley and Arroyo Valle provides a clear view of the complex drainage systems that shaped early water rights and movement through these coastal mountains.