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1915 Map of Concord

Name: 1915 Topographic Map of Concord
Creator: U.S. Geological Survey
Published: 1947
License: https://creativecommons.org/publicdomain/mark/1.0/

USGS Topo · Published 1947

About this map

The hills of the East Bay and the agricultural basins of Contra Costa County are captured here just before the era of major suburbanization. This landscape is defined by the massive Mexican land grant ranchos, such as Boca De La Canada Del Pinole and Laguna De Los Palos Colorados, which still dictated property lines and regional names at the time of the 1913-14 revision. Settlement is concentrated in established towns like Concord and Walnut Creek, while the hills are crossed by the Oakland Antioch and Eastern Ry and the San Ramon Valley Branch Southern Pacific RR.

In the southwest, the edge of Oakland reaches toward the hills, featuring Mills College and Piedmont. The interior reveals a quieter era of rural life, with small rail stops like Meinert and Hookston serving the Ygnacio Valley. The Mount Diablo Base Line serves as a critical surveying reference across the map, bisecting a terrain that ranges from the tidal edges of San Leandro Bay to the high peaks of Grizzly Peak and Redwood Peak.