1949 Map of Yorba Linda

In the rugged northern terrain, the map identifies specific leisure and natural landmarks such as La Vida Mineral Springs and Carbon Canyon Mineral Springs. This period captures a moment when local water management was critical, as seen in the Yorba Linda Res and the Percolation Basin near the Santa Ana Canyon. These features represent a landscape moving from its ranching and oil-drilling roots toward a suburban future, while still defined by the deep natural relief of the Chino Hills and La Puente Hills.