2021 Map of Mendenhall Springs

About this map

Mendenhall Springs sits within a complex of high ridges and deep canyons in the Diablo Range, as documented in this 2021 survey of Alameda County. The landscape is dominated by the waters of Lake del Valle and the engineering of the Hetch Hetchy Aqueduct, which cuts through the mountainous terrain. High-altitude flats such as Shafer Flat, Rose Flat, and Hamilton Flat suggest a history of seasonal grazing or small upland settlements away from the primary drainages of Arroyo Valle and Arroyo Mocho. Prominent summits including Rose Peak and Discovery Peak anchor the southern portion of the sheet, providing significant landmarks for hikers and local historians tracing the geography of the northern Diablo Range before it descends toward the coastal valleys.