Thye built that canal and water storage lakes in the late 1960s and finish it in early 1970s. They called it the Feather River Project L.A. started importing water from the Ownes valley on the east side of the Seirra Mtns. in the early 1900s, they also built several different canals form the Colorado river into L.A. before the 1950, one from Lake Havasu and another from the border of the U.S. and Mexico that they named the All American canal
The L.A. Basin was home to many large citrus groves and many other types of produce in the 1900 up to the early to mid 1940s when the invaders from all the other states in our country started moving there for the better weather and living conditions, now it is commercial development and housing tracts from the Pacific Ocean to the mountain passes leading out into the Mojave Desert