
San Gabriel and the historic San Gabriel Mission anchor the northwestern portion of this mid-1960s landscape, showing a dense suburban expansion across the San Gabriel Valley. The survey details the complex hydraulic management of the Rio Hondo and San Gabriel River, converging at the massive Whittier Narrows Dam. Large colonial-era land grants like Rancho Potrero De Felipe Lugo and Rancho La Merced still define the underlying geography, even as the San Bernardino Freeway and Pomona Freeway carve through the terrain. To the south, the Montebello Oil Field and the sprawling grounds of Rose Hills Memorial Park (Cem) occupy the base of the Puente Hills, illustrating the intersection of natural resources, early California landholdings, and mid-century urban planning.
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