Mount Diablo Surveyors Historical Society

 

 

THE   MOUNT   DIABLO

 

SURVEY   MARKS

 

 

WITH ITS UNOBSTRUCTED VIEW, MOUNT DIABLO'S SUMMIT HAS LONG BEEN AN IMPORTANT REFERENCE POINT FOR LAND SURVEYS IN THE FAR WEST. IN 1851, COL. LEANDER RANSOM BEGAN SUBDIVIDING THE PUBLIC LANDS BY ESTABLISHING THE MOUNT DIABLO INITIAL POINT. FROM THIS POINT, LINES WERE EXTENDED NORTH, SOUTH, EAST AND WEST FORMING A SURVEY GRID THAT COVERS MOST OF NORTHERN CALIFORNIA AND ALL OF NEVADA. THIS POINT IS MARKED BY A RECTANGULAR DEPRESSION IN THE EXPOSED BEDROCK, THREE FEET NORTHEAST FROM THE CENTER OF THIS PILLAR. IN 1852, R. D. CUTTS OF THE COAST SURVEY ESTABLISHED A DIFFERENT SURVEY MARK FROM WHICH HE BEGAN MAPPING THE STATE'S WATERWAYS AND SURROUNDING TOPOGRAPHY. THIS POINT IS MARKED BY THE COPPER BOLT INSIDE THE BASE OF THIS PILLAR.

 

 

PLAQUE DONATED BY:

 

NORTHERN AND SOUTHERN CALIFORNIA SECTIONS OF THE

 

 AMERICAN CONGRESS ON SURVEYING AND MAPPING

 

 

MOUNT DIABLO SURVEYORS HISTORICAL SOCIETY

 

 

EAST BAY, SAN MATEO/SANTA CLARA, MONTEREY BAY CHAPTERS

 

OF THE CALIFORNIA LAND SURVEYORS ASSOCIATION

 

 

OPERATING ENGINEERS NORTHERN CALIFORNIA SURVEYORS JOINT APPRENTICE COMMITTEE

 

 

 

KHARNEY'S PATTERN WORKS AND FOUNDRY

 

 

PLACED IN 1993

 

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