Mount Diablo Summit is the highest point
in the East Bay. On its top sits the historic summit building,
which was constructed between 1939 and 1942 by the Civilian Conservation
Corps. This castle-like building with its stone walls, octagonal beacon tower
and observation deck houses the
Summit Visitor Center—open year
round, every day from 10 a.m. to 4 p.m.
On a clear day, you can enjoy views of the Farallon Islands,
the San Francisco Bay Area and Carquinez Strait as well as parts of the
Central Valley and the Sierra Nevada.
Several hundred feet below the summit building, the
Devil's Pulpit dominates the southeast
slope of Diablo's chaparral and open-forest landscape.
This monolith consists of erosion-resistant Franciscan chert formed over
90 million years ago far out at sea. It contains microfossils such as
radiolaria that once settled on the ocean floor and over time transformed
The North Peak Trail
leads hikers from Devil's Elbow around Devil's Pulpit
to Prospector's Gap and then uphill into the rugged
North Peak area.