Mount Diablo

Mount Diablo State Park, Danville, CA

Initial Point for Northern California & Nevada Land Surveys


View of Mount Diablo and CA Highway 24 from Lafayette Heights

By Trurl66 - Own work, Public Domain,


Street View 


"Mount Diablo had been a home with spiritual significance to the Costanoan Indians for at least 500 years when Spanish explorers viewed the mountain in 1772. In 1851 Mount Diablo was selected as the initial point for land surveys of Northern California and Nevada, with the Mount Diablo Base and Meridian Lines originating at its peak. Due to the mountain's variations in wind, rainfall, and temperature, it is also a preserve for a wide variety of plant and animal life." - California Historic Landmark No.905

Update Log 

  • July 27, 2022: Updated by Bill Eichelberger: Mapped landmark
  • July 27, 2022: New photo from Bill Eichelberger
  • March 31, 2019: Added by Richard Doody