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 pigeon distributed throughout the Pacific. The Pacific ("D. pacifica") and the Micronesian ("D. oceania") imperial pigeons are similar allospecies, while the Polynesian ("D. aurorae") and Marquesan ("D. galeata") imperial pigeons are larger birds with dark plumage. The red-knobbed imperial pigeon ("D. rubricera") and the spice imperial pigeon ("D. myristicivora") are similar but found in Melanesia and New Guinea. c) The "finschii" subgroup of four species which may be New Guinea representatives of "D. aenea" stock; the purple-tailed ("D. rufigaster"), cinnamon-bellied ("D. basilica") and Finsch's imperial pigeons, which all inhabit offshore islands. The shining or rufescent imperial pigeon ("D. chalconota") occupies more