Mount Diablo

California State Historic Landmark 905

Plaque exists. Site exists. Landmark location. Links

Plaque Photo:

#905 Mount Diablo
Mount Diablo, sacred to Native Americans who lived and worshipped there for over 5,000 years, became a critical reference point for Spanish explorers in the 18th century, and American trappers and early California settlers in the 19th. In 1851 Colonel Leander Ransome established the crossing of the Mount Diablo base and meridian lines from which most of California and Nevada are surveyed.

Site Photo:




Mt. Diablo State Park, on summit, 4.5 mi E of ranger station.


Landmark logo Return to other landmarks in Contra Costa county.

Please note: I have no connection to any organizations mentioned on this site.

Site contents copyright 1996-2000 by Donald Laird - all rights reserved

Send comments to:
Donald Laird