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 first school in the valley and the first Chamber of Commerce. The City of Imperial was incorporated July 12, 1904 thus being the first city in the valley to incorporate. The city was originally thought to become the county seat, but lost out to the City of El Centro in 1907. Imperial through the years became the location for the home of the Imperial Irrigation District, the California mid-winter fair and the Imperial County airport. Also several businesses were established in the city. Imperial was devastated by earthquakes in 1916 and 1940. An earthquake in 1979 destroyed many of the