1956 Map of Mendenhall Springs

About this map

Mendenhall Springs stands as a focal point in this 1956 survey of the Alameda County highlands, where the topography is defined by the deep incisions of Arroyo Mocho and the complex drainage systems of San Antonio Creek and La Costa Creek. The landscape shows a distinct transition between the mid-century agricultural grazing lands at Shafer Flat and Rose Flat and the development of water infrastructure. The arrival of Lake Del Valle, indicated in purple revisions from 1971, illustrates the creation of the Del Valle State Recreation Area, a major engineering shift that altered the canyon floors.