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 crown Imperial crown An Imperial Crown is a crown used for the coronation of emperors. Crowns in Europe during the medieval period varied in design: During the medieval era the crowns worn by English kings had been described as both closed (or arched) and open designs. This was in contrast with kings of France who always wore an open crown. However, there is academic debate on how often closed crowns were used in England during this period, as the first unequivocal use of the closed crown was by Henry IV at his coronation on 13 October 1399. However his effigy on