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 high temperature is 67 degrees with a low of 39. In July, the normal high temperature is 105 degrees with a low of 77. Imperial was created by the Imperial Land Company and was named by George Chaffey. The first post office at Imperial opened in 1901. Imperial incorporated in 1904. The first mayor of Imperial was Allison Peck. The town-site of Imperial was plotted in 1902 for home and commercial businesses. A few of the many firsts was a printing press, drug store, grocery store, brick building, and the first church. The City can also boast of having the