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Lower Colorado River Valley

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Title: Lower Colorado River Valley  
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Subject: Lower Colorado River Valley, Genesis Solar Energy Project, Imperial Reservoir, List of Arizona Wilderness Areas, Palo Verde Valley
Collection: Geography of the Colorado Desert, Landforms of Imperial County, California, Landforms of La Paz County, Arizona, Landforms of Mohave County, Arizona, Landforms of Yuma County, Arizona, Lower Colorado River Valley, Regions of Arizona, Regions of California, Sonoran Desert, Valleys of Arizona, Valleys of California, Valleys of Riverside County, California, Valleys of San Bernardino County, California, Valleys of the Mojave Desert, Winterhaven, California, Yuma, Arizona
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Lower Colorado River Valley

A section of the LCRV showing the Colorado Desert-(yellow highlight) in west, the Salton Sea, and the three US bordering states on the Colorado River. Portions of the Mexican states of Baja California and Sonora also shown. Proximity to San Diego and the rain shadow of coastal mountains, also shown.

The Lower Colorado River Valley ("LCRV") is the river region of the lower Colorado River of the southwestern United States in North America that rises in the Rocky Mountains and has its outlet at the Colorado River Delta in the northern Sea of Cortez in northwestern Mexico, between the states of Baja California and Sonora. This north–south stretch of the Colorado River forms the border between the U.S. states of California and Arizona, and Nevada and Arizona;[1] also between the Mexican states of Baja California and Sonora.

It is commonly defined as the region from below Hoover Dam and Lake Mead to its outlet at the northern Gulf of California (Sea of Cortez); it includes the Colorado River proper, canyons, the valley, mountain ranges with wilderness areas, and the floodplain and associated riparian environments. It is home to recreation activities from the river, the lakes created by dams, agriculture, and the home of various cities, communities, and towns along the river, or associated with the valley region. Five Indian reservations are located in the LCRV: the Chemehuevi, Fort Mojave and Colorado River Indian Reservations; at Yuma are the Quechan and Cocopah reservations.

Contents

  • The LCRV, a desert region 1
  • Ecological threats 2
  • List of major cities and communities 3
  • Complete list of towns, areas, etc, north to south 4
    • Feeder-valleys, or included small valleys 4.1
  • See also 5
  • References 6
  • External links 7

The LCRV, a desert region

Trigo Mountains Wilderness, a ridgeline wilderness area on the eastern border of the river proper, 30 miles north of Yuma-Winterhaven. A single 3-foot, (1.1-meter) Buckhorn Cholla cactus is in foreground; creosote bush scrubland on hillsides.

Some of the highest desert temperatures-(of North America) are recorded in the LCRV, rivaling Death Valley; specifically Bullhead City, Laughlin, Needles, Yuma, or the southeast deserts of California, west of the Colorado River. The LCRV is defined by three deserts. The Mojave Desert is in southeast California, southern Nevada, and northwest Arizona. To the south is the Sonoran Desert on both sides of the Colorado River. However an ecozone delineation occurs in the transition from Arizona to southeast California; consequently the western side of the Colorado River is defined as the western Sonoran Desert and given the name Colorado Desert; the ecozone of this western Sonoran Desert extends south into the northwest region of Sonora, Mexico and the extreme northeast of northern Baja California, Mexico.

The Colorado River watershed; the LCRV arbitrarily starts south of Lake Mead, at Hoover Dam in Nevada.

The Lower Colorado River Valley is located in the north, and northwestern Sonoran Desert; the Sonoran Desert region proper extends from areas west of the river, and then southeastwards to southeast Arizona, south to the tip of Baja California Sur, eastwards of the Baja Peninsula cordillera, and south through Sonora state, Mexico to the northern border of neighboring Sinaloa.

The LCRV extends about 350 miles (563 km) from Hoover Dam to the Colorado River Delta. The Sonoran Desert itself is more than twice as extensive north-to-south, and about 450 miles (724 km) in width. Two species, Desert Ironwood-(Olneya tesota)[2] and the Lesser Long-nosed Bat, have geographic ranges identical to the Sonoran Desert, and are indicator species of the Sonoran Desert region. The spring flowering of Ironwood, and the bat species migration arrivals also become indicators of annual or multi-year climate trends for regions of the Sonoran Desert.

Ecological threats

The Lower Colorado River Valley subregion of the Sonoran Desert bioregion has multiple threats. Some major threats include urbanization, clearing of land for agriculture, human occupancy – especially as a result of imported external resources, and camping and camptrailers on BLM land. Other threats include harvesting for fuelwood, campfires, etc. of desert ironwood, Olneya tesota, destruction of land by offroad vehicles, especially in sand dunes, and harvesting and manipulation of groundwater.[3]

List of major cities and communities

Complete list of towns, areas, etc, north to south

Feeder-valleys, or included small valleys

See also

References

  1. ^ "Lower Colorado River Valley" section, Center for Sonoran Desert Studies; [1]
  2. ^ Atlas of United States Trees, Volume 3, Minor Western Hardwoods, Map 103-Olneya tesota
  3. ^ Lower Colorado River ValleyEcological threats,
  • Little. Atlas of United States Trees, Volume 3, Minor Western Hardwoods, Little, Elbert L, 1976, US Government Printing Office. Library of Congress No. 79-653298. Map 103, Olneya tesota.

External links

  • Journey of the Nectar Bats
  • Map, and Lesser Long-nosed Bat range; Signs of SpringArticle:
  • "Lower Colorado River Valley" section, Center for Sonoran Desert Studies

Ecology

  • Lower Colorado River Valley, "Worsening Threats, Vulnerable Species and Areas and Areas Meriting Protection in the Subregions of the Sonoran Desert Bioregion"

Water Resources, Dams

  • , Lower Colorado River basins, planning, (with Basin/Regions map)(southern, Arizona section)
  • );Area Watersheds Map, w/ an Upper Colorado River Planning Area Surface Water Hydrology, Lower Colorado River basins, (Mohave County, & NW Arizona, (northern, Arizona section) Sacramento Wash, etc.
  • US Bureau of Reclamation, "Dams Along the Lower Colorado River"
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