Imperial Reservoir Imperial Reservoir The Imperial Reservoir is an artificial lake formed by the construction of the Imperial Diversion Dam across the Colorado River in the Lower Colorado River Valley of Imperial County, California, and Yuma County, Arizona. A component of the Imperial National Wildlife Refuge, the reservoir is northeast of Yuma, Arizona. Dry washes are the major watershed feed systems to Imperial Reservoir. The next upstream major watershed feeder is the Bill Williams River from western Arizona. Upstream on the Colorado River, the basic feeder watershed to Imperial Reservoir is the Havasu-Mojave Lakes Watershed, of Lake Havasu. Two dry wash watershed
Imperial, California Imperial, California Imperial is a city in Imperial County, California. Imperial is located north of El Centro. As of the 2010 census, the city had a population of 14,758. It is part of the El Centro metropolitan area. In 2016 Imperial was the fourth fastest-growing city in the state, gaining 4.1 percent more residents from January 1, 2015 to January 1, 2016. It compares to Imperial County’s growth of 1.3 percent and Brawley’s growth of 1.2 percent. Nearby recreation facilities transform the desert into a popular Valley tourist destination due to availability of activities. Three year-round golf courses are within