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1903 Map of Cucamonga

Name: 1903 Topographic Map of Cucamonga
Creator: U.S. Geological Survey
Published: 1903
License: https://creativecommons.org/publicdomain/mark/1.0/

USGS Topo · Published 1903

About this map

The San Antonio Mountains dominate the northern landscape of this survey, which captures the burgeoning agricultural and transit corridor of the Inland Empire at the turn of the century. The map reveals a highly structured grid of citrus groves and vineyards emerging below the San Gabriel Timber Land Reserve, serviced by an intensive network of competing rail lines. The Atchison Topeka and Santa Fe R. R. and the Southern Pacific R. R. cut through the heart of the valley, supporting established centers like Ontario and Pomona alongside smaller rail stops such as Etiwanda Sta. and Rochester.

Water management is central to the area's development, evidenced by the Power House in San Antonio Creek and various mountain canyons like Cucamonga Canyon and Day Canyon that fed the valley floor. Settlement patterns show a shift from mountain outposts like the Toll House toward the organized towns of Ioamosa and Cucamonga, while the southern reaches of the Santa Ana Del Chino land grant remain less densely subdivided, highlighting the transition from ranching to intensive irrigation.