2015 Map of Las Trampas Ridge

About this map

Rocky Ridge and Las Trampas Ridge dominate this East Bay landscape, carving a series of steep canyons and valleys between the developing suburbs of the early 21st century. The map illustrates the interface between dense residential expansion and protected open space, featuring the Eugene O'Neil National Historical Site and the academic grounds of Saint Marys Coll of California. Major water infrastructure is prominent in the southwest, where the San Leandro Tunnel connects to the Upper San Leandro Reservoir, reflecting the region's managed hydrography. The corridor of Interstate 680 serves as the primary artery connecting the communities of Walnut Creek, Alamo, and Danville, while numerous smaller creeks like San Ramon Cr and Bollinger Canyon Cr trace the natural drainage patterns of the Diablo Range foothills.