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 Sword Imperial Sword The Imperial Sword () is one of the four most important parts of the Imperial Regalia ("Reichskleinodien") of the Holy Roman Empire. During a coronation, it was given to the emperor along with the Imperial Crown ("Reichskrone"), Imperial Sceptre ("Reichszepter"), and the Imperial Orb ("Reichsapfel"). All four parts of the Imperial Regalia are displayed in the Imperial Treasury at the Hofburg Palace in Vienna, Austria. The Imperial Sword was made for Emperor Otto IV in the twelfth century, possibly for his coronation as King of the Romans in 1198. Its predecessor, the sword of Otto III, is also