This is a List of mountain ranges of the Lower Colorado River Valley, located in the western part of the southwestern United States; the eastern region would be the Rio Grande Valley of New Mexico, Texas, and northern Mexico. This doubled list has the North–South running Colorado River sectioned into the west side of the river vs. the east side. The east side of the Colorado River is represented by the states of Arizona-Sonora, Mexico. The west side of the river is represented by southern Nevada, southeast Low Desert California, and a portion of northwestern Mexico, represented by the state of Baja California-(the North). West-bank, East-bank mountain ranges The numbered Mountain ranges abut the Colorado River proper or are associated with valleys or plains, and are somewhat arbitrary. (Though the river flows north to south, a few ranges are East–West, or Northwest–Southeast, per the original Basin and Range faulting.) West Bank–Colorado Riv. .. Mojave Desert (Boulder City, Nevada) 1–Eldorado Mountains–Nevada El Dorado Canyon, (Nelson, Nev.) 2–Newberry Mountains (Nevada) Pyramid Canyon 3–Dead Mountains 4–Sacramento Mountains (California) 5–Piute Range–Calif/Nevada Lanfair Valley, Piute Range–Calif/Nevada New York Mountains-(Mojave National Preserve)–Calif/Nevada .. Turtle Mountains4–Sacramento Mountains (California) Chemehuevi Valley 6–Chemehuevi Mountains Chemehuevi Valley Turtle Mountains,7–-Whipple Mountains Mojave Desert Colorado Desert Turtle Mountains,8.5–Nopah Range-Vidal Valley .. 9–Riverside Mountains Sand dunes,--Rice Valley Big Maria Mountains Little Maria Mountains, 10–Big Maria Mountains 11–McCoy Mountains Palo Verde Valley 12–Mule Mountains (California) .. .. 13–Chuckwalla Mountains 14–Chocolate Mountains ... .. 15–Imperial Dam Long Term Visitor Area=Senator Wash Hills Algodones Dunes 16–Cargo Muchacho Mountains 17–Pilot Knob (Imperial County, California) Colorado Desert–W. Sonoran Des. .. West Bank–Colorado Riv. East Bank–Colorado Riv. Mojave Desert Lake Mead Black Mtns: Mount Wilson (5445 ft) Detrital Plain, White Hills 1–Black Mountains, Cerbat Mountains Black Canyon of the Colorado Sacramento Valley 2–Black Mesa (western Arizona), Hualapai Mountains-(Hualapai Mountain) Mohave Valley, 2.5–Black Mesa (western Arizona) 3–Mohave Mountains Dutch Flat Dutch Flat, McCracken Mountains, Poachie Range Aubrey Hills Bill Williams Mountains Rawhide Mountains Bill Williams River and the Big Sandy River (Arizona)-(Kingman, Arizona) 4–Buckskin Mountains (Arizona) Buckskin Mountain State Park Cactus Plain Sonoran Desert La Posa Plain, Plomosa Mountains 5–Dome Rock Mountains, Harcuvar Mountains Kofa Mountains Castle Dome Mountains 6–Trigo Mountains, Chocolate Mountains (Arizona) Castle Dome Plain United States Army Yuma Proving Ground Laguna Mountains (Arizona)7–Muggins Mountains Gila River Laguna Mountains (Arizona) Yuma Desert 8–Gila Mountains, Tinajas Altas Mountains, Lechuguilla Desert Sonoran Desert Reserva de la Biosfera el Pinacate y