1995 Map of Briones Valley

About this map

John Muir National Historic Site and the historic settlement of Muir anchor the northeastern corner of this study, where the Southern Pacific tracks navigate the gap near Martinez. The landscape is defined by the high ridges of the East Bay, including Pinole Ridge and Sobrante Ridge, which frame the critical water infrastructure of the Briones Reservoir and San Pablo Reservoir. Large tracts of protected land, such as Charles Lee Tilden Regional Park and Briones Regional Park, preserve the topography between the growing residential centers of Orinda and Lafayette. The map illustrates the complex intersection of early Spanish land grants, including Rancho El Sobrante and Rancho Acalanes, with the mid-century suburban expansion of the 1950s. Infrastructure like the Mokelumne Aqueduct underscores the region's role in the California water system.