1903 Map of Cuyamaca

About this map

The San Diego Cuyamaca and Eastern R.R. anchors the western edge of this landscape, reflecting the rail-driven growth of the region at the start of the 20th century. This survey details a complex geography of Spanish-named land grants and ranchos, including Jamul, Jamacha, and Otay (Estudillo), which illustrate the transition from Mexican era landholdings to American administration. The terrain rises sharply from the coastal plains toward the interior highlands, marked by the prominent peaks of the Cuyamaca Pk. range and the Capitan Grande Indian Reservation. Water management for the growing population is evident through features like the Cuyamaca Reservoir and early masonry structures at Barrett Dam and Morena Dam. Scattered settlements such as Bostonia, Alpine, and Dulzura are shown alongside smaller outposts like Honey Springs Ranch, providing a window into early San Diego County's rural backcountry before the mid-century suburban expansion.