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1967 Map of Prado Dam

Name: 1967 Topographic Map of Prado Dam
Creator: U.S. Geological Survey
Published: 1968
License: https://creativecommons.org/publicdomain/mark/1.0/

USGS Topo · Published 1968

About this map

The Prado Flood Control Basin dominates the lower landscape of this mid-1960s survey, marking a critical point of water management where Chino Creek and Cucamonga Creek meet the Santa Ana River. At the heart of this system stands the massive Prado Dam, a centerpiece of regional infrastructure. The map captures a transition from agricultural use to institutional and residential development, evidenced by the large footprints of the California Institution for Men and the California Institution for Women (Frontera PO).

Cultural and historical sites are scattered throughout the Chino Hills and the surrounding valley, including the Yorba Slaughter Adobe and the specialized community of Boys Republic. Local industry and recreation are represented by the State Fish Hatchery, the Bird Farm, and the Los Serranos Country Club. This era shows the expansion of the regional road network with the Corona Freeway and Pomona Freeway cutting through the historic rancho lands.