Muir Woods National Monument
Muir Woods National Monument is a United States National Monument managed by the National Park Service. It is located in southwestern Marin County, California, it is part of the Golden Gate National Recreation Area, is 12 miles north of San Francisco. It protects 554 acres, of which 240 acres are old growth coast redwood forests, one of a few such stands remaining in the San Francisco Bay Area; the Muir Woods National Monument is an old-growth coastal redwood forest. Due to its proximity to the Pacific Ocean, the forest is shrouded in a coastal marine layer fog, contributing to a wet environment that encourages vigorous plant growth; the fog is vital for the growth of the redwoods as they use moisture from the fog during droughty seasons, in particular the dry summer. The monument is cool and moist year round with average daytime temperatures between 40 and 70 degrees Fahrenheit. Rainfall is heavy during the winter and summers are completely dry with the exception of fog drip caused by the fog passing through the trees.
Annual precipitation in the park ranges from 39.4 inches in the lower valley to 47.2 inches higher up in the mountain slopes. The redwoods grow on brown humus-rich loam which may be stony or somewhat sandy; this soil has been assigned to the Centissima series, always found on sloping ground. It is well drained, moderately deep, to moderately acidic, it has developed from a mélange in the Franciscan Formation. More open areas of the park have shallow gravelly loam of the Barnabe series, or deep hard loam of the Cronkhite series. One hundred fifty million years ago ancestors of redwood and sequoia trees grew throughout the United States. Today, the Sequoia sempervirens can be found only in a narrow, cool coastal belt from Monterey County, California, in the south to Oregon in the north. Before the logging industry came to California, there were an estimated 2 million acres of old growth forest containing redwoods growing in a narrow strip along the coast. By the early 20th century, most of these forests had been cut down.
Just north of the San Francisco Bay, one valley named Redwood Canyon remained uncut due to its relative inaccessibility. This was noticed by William Kent, a rising California politician who would soon be elected to the U. S. Congress, he and his wife, Elizabeth Thacher Kent, purchased 611 acres of land from the Tamalpais Land and Water Company for $45,000 with the goal of protecting the redwoods and the mountain above them. The deal was facilitated by his activist wife, Laura Lyon White. In 1907, a water company in nearby Sausalito planned to dam Redwood Creek, thereby flooding the valley; when Kent objected to the plan, the water company threatened to use eminent domain and took him to court to attempt to force the project to move ahead. Kent sidestepped the water company's plot by donating 295 acres of the redwood forest to the federal government, thus bypassing the local courts. On January 9, 1908, President Theodore Roosevelt declared the land a National Monument, the first to be created from land donated by a private individual.
The original suggested name of the monument was the Kent Monument but Kent insisted the monument be named after naturalist John Muir, whose environmental campaigns helped to establish the National Park system. President Roosevelt agreed, writing back: My Dear Mr. Kent: By George you are right!and, responding to some photographs of Muir Woods that Mr. Kent had sent him, Those are awfully good photos. Kent and Muir had become friends over shared views of wilderness preservation, but Kent's support for the flooding of Hetch Hetchy caused Muir to end their friendship. In December 1928, the Kent Memorial was erected at the Kent Tree in Fern Canyon; this tree—a Douglas fir, not a redwood—was said to be Kent's favorite. Due to its height of 280 feet and location on a slope, the tree leaned towards the valley for more than 100 years. Storms in El Niño years of 1981 and 1982 caused the tree to tilt more and took out the top 40 feet of the tree. During the winter of 2002–03, many storms brought high winds to Muir Woods causing the tree to lean so much that a fissure developed in January 2003.
This fissure grew larger as the tree leaned more and more, forcing the closure of some trails. On March 18, 2003, at around 8:28 pm, the tree fell; the closed trails have since been reopened. In 1937, the Golden Gate Bridge was completed and park attendance tripled, reaching over 180,000. Muir Woods is one of the major tourist attractions of the San Francisco Bay Area, with 776,000 visitors in 2005. President Franklin Delano Roosevelt died on April 12, 1945, shortly before he was to have opened the United Nations Conference on International Organization for which delegates from 50 countries met in San Francisco to draft and sign the United Nations Charter. On May 19, the delegates held a commemorative ceremony in tribute to his memory in Muir Woods' Cathedral Grove, where a dedication plaque was placed in his honor; the monument was listed on the National Register of Historic Places on January 9, 2008. The main attraction of Muir Woods are the coast redwood trees, they are known for their height, are related to the giant sequoia of the Sierra Nevada.
While redwoods can grow to nearly 380 feet, the tallest tree in the Muir Woods is 258 feet. The trees come from a seed no bigger than that of a tomato. Most of the redwoods in the monument are between 800 years old; the oldest is at least 1,200 years old. Other tree species grow in the understory of the redwood groves. Three of t
A summit is a point on a surface, higher in elevation than all points adjacent to it. The topographic terms acme, apex and zenith are synonymous; the term top is used only for a mountain peak, located at some distance from the nearest point of higher elevation. For example, a big massive rock next to the main summit of a mountain is not considered a summit. Summits near a higher peak, with some prominence or isolation, but not reaching a certain cutoff value for the quantities, are considered subsummits of the higher peak, are considered part of the same mountain. A pyramidal peak is an exaggerated form produced by ice erosion of a mountain top. Summit may refer to the highest point along a line, trail, or route; the highest summit in the world is Everest with height of 8844.43 m above sea level. The first official ascent was made by Sir Edmund Hillary, they reached the mountain`s peak in 1953. Whether a highest point is classified as a summit, a sub peak or a separate mountain is subjective; the UIAA definition of a peak is.
Otherwise, it's a subpeak. In many parts of the western United States, the term summit refers to the highest point along a road, highway, or railroad. For example, the highest point along Interstate 80 in California is referred to as Donner Summit and the highest point on Interstate 5 is Siskiyou Mountain Summit. A summit climbing differs from the common mountaineering. Summit expedition requires: 1+ year of training, a good physical shape, a special gear. Although a huge part of climber’s stuff can be left and taken at the base camps or given to porters, there is a long list of personal equipment. In addition to common mountaineers’ gear, Summit climbers need to take Diamox and bottles of oxygen. There are special requirements for crampons, ice axe, rappel device, etc. Geoid Hill – Landform that extends above the surrounding terrain Nadir Summit accordance Peak finder Summit Climbing Gear List
National Park Service
The National Park Service is an agency of the United States federal government that manages all national parks, many national monuments, other conservation and historical properties with various title designations. It was created on August 25, 1916, by Congress through the National Park Service Organic Act and is an agency of the United States Department of the Interior; the NPS is charged with a dual role of preserving the ecological and historical integrity of the places entrusted to its management, while making them available and accessible for public use and enjoyment. As of 2018, the NPS employs 27,000 employees who oversee 419 units, of which 61 are designated national parks. National parks and national monuments in the United States were individually managed under the auspices of the Department of the Interior; the movement for an independent agency to oversee these federal lands was spearheaded by business magnate and conservationist Stephen Mather, as well as J. Horace McFarland. With the help of journalist Robert Sterling Yard, Mather ran a publicity campaign for the Department of the Interior.
They wrote numerous articles that praised the scenic and historic qualities of the parks and their possibilities for educational and recreational benefits. This campaign resulted in the creation of a National Park Service. On August 25, 1916, President Woodrow Wilson signed a bill that mandated the agency "to conserve the scenery and the natural and historic objects and wildlife therein, to provide for the enjoyment of the same in such manner and by such means as will leave them unimpaired for the enjoyment of future generations." Mather became the first director of the newly formed NPS. On March 3, 1933, President Herbert Hoover signed the Reorganization Act of 1933; the act would allow the President to reorganize the executive branch of the United States government. It wasn't until that summer when the new President, Franklin D. Roosevelt, made use of this power. Deputy Director Horace M. Albright had suggested to President Roosevelt that the historic sites from the American Civil War should be managed by the National Park Service, rather than the War Department.
President Roosevelt issued two Executive orders to make it happen. These two executive orders not only transferred to the National Park Service all the War Department historic sites, but the national monuments managed by the Department of Agriculture and the parks in and around the capital, run by an independent office. In 1951, Conrad Wirth became director of the National Park Service and went to work on bringing park facilities up to the standards that the public expected; the demand for parks after the end of the World War II had left the parks overburdened with demands that could not be met. In 1952, with the support of President Dwight D. Eisenhower, he began Mission 66, a ten-year effort to upgrade and expand park facilities for the 50th anniversary of the Park Service. New parks were added to preserve unique resources and existing park facilities were upgraded and expanded. In 1966, as the Park Service turned 50 years old, emphasis began to turn from just saving great and wonderful scenery and unique natural features to making parks accessible to the public.
Director George Hartzog began the process with the creation of the National Lakeshores and National Recreation Areas. Since its inception in 1916, the National Park Service has managed each of the United States' national parks, which have grown in number over the years to 60. Yellowstone National Park was the first national park in the United States. In 1872, there was no state government to manage it, so the federal government assumed direct control. Yosemite National Park began as a state park. Yosemite was returned to federal ownership. At first, each national park was managed independently, with varying degrees of success. In Yellowstone, the civilian staff was replaced by the U. S. Army in 1886. Due to the irregularities in managing these national treasures, Stephen Mather petitioned the federal government to improve the situation. In response, Secretary of the Interior Franklin K. Lane challenged him to lobby for creating a new agency, the National Park Service, to manage all national parks and some national monuments.
Mather was successful with the ratification of the National Park Service Organic Act in 1916. The agency was given authority over other protected areas, many with varying designations as Congress created them; the National Park System includes. The title or designation of a unit need not include the term park; the System as a whole is considered to be a national treasure of the United States, some of the more famous national parks and monuments are sometimes referred to metaphorically as "crown jewels". The system encompasses 84.4 million acres, of which more than 4.3 million acres remain in private ownership. The largest unit is Wrangell-St. Elias National Park and Preserve, Alaska. At 13,200,000 acres, it is over 16 percent of the entire system; the smallest unit in the system is Thaddeus Kosciuszko National Memorial, Pennsylvania, at 0.02 acre. In addition to administering its units and other properties, the National Park Service provides technical and financial assistance to several "affiliated areas" authorized by Congress.
The largest affiliated area is New Jersey Pinelands National Reserve at 1,164,025 acres. The smallest is Benjamin Franklin National Memorial at less than 0.01 acres. Although all units of the Nat
The Mojave Desert is an arid rain-shadow desert and the driest desert in North America. It is in the southwestern United States within southeastern California and southern Nevada, it occupies 47,877 sq mi. Small areas extend into Utah and Arizona, its boundaries are noted by the presence of Joshua trees, which are native only to the Mojave Desert and are considered an indicator species, it is believed to support an additional 1,750 to 2,000 species of plants. The central part of the desert is sparsely populated, while its peripheries support large communities such as Las Vegas, Lancaster, Victorville, St. George; the Mojave Desert is bordered by the Great Basin Desert to its north and the Sonoran Desert to its south and east. Topographical boundaries include the Tehachapi Mountains to the west, the San Gabriel Mountains and San Bernardino Mountains to the south; the mountain boundaries are distinct because they are outlined by the two largest faults in California – the San Andreas and Garlock faults.
The Mojave Desert displays typical range topography. Higher elevations above 2,000 ft in the Mojave are referred to as the High Desert; the Mojave Desert occupies less than 50,000 sq mi, making it the smallest of the North American deserts. The Mojave Desert is referred to as the "high desert", in contrast to the "low desert", the Sonoran Desert to the south; the Mojave Desert, however, is lower than the Great Basin Desert to the north. The spelling Mojave originates from the Spanish language while the spelling Mohave comes from modern English. Both are used today, although the Mojave Tribal Nation uses the spelling Mojave; the Mojave Desert receives less than 2 inches of rain a year and is between 2,000 and 5,000 feet in elevation. The Mojave Desert contains the Mojave National Preserve, as well as the lowest and hottest place in North America: Death Valley at 282 ft below sea level, where the temperature surpasses 120 °F from late June to early August. Zion National Park in Utah lies at the junction of the Mojave, the Great Basin Desert, the Colorado Plateau.
Despite its aridity, the Mojave has long been a center of alfalfa production, fed by irrigation coming from groundwater and from the California Aqueduct. The Mojave is a desert of two distinct seasons. Winter months bring comfortable daytime temperatures, which drop to around 25 °F on valley floors, below 0 °F at the highest elevations. Storms moving from the Pacific Northwest can bring rain and in some places snow. More the rain shadow created by the Sierra Nevada as well as mountain ranges within the desert such as the Spring Mountains, bring only clouds and wind. In longer periods between storm systems, winter temperatures in valleys can approach 80 °F. Spring weather continues to be influenced by Pacific storms, but rainfall is more widespread and occurs less after April. By early June, it is rare for another Pacific storm to have a significant impact on the region's weather. Summer weather is dominated by heat. Temperatures on valley floors can soar above 130 °F at the lowest elevations. Low humidity, high temperatures, low pressure, draw in moisture from the Gulf of Mexico creating thunderstorms across the desert southwest known as the North American monsoon.
While the Mojave does not get nearly the amount of rainfall the Sonoran desert to the south receives, monsoonal moisture will create thunderstorms as far west as California's Central Valley from mid-June through early September. Autumn is pleasant, with one to two Pacific storm systems creating regional rain events. October is one of the sunniest months in the Mojave. After temperature, wind is the most significant weather phenomenon in the Mojave. Across the region windy days are common. During the June Gloom, cooler air can be pushed into the desert from Southern California. In Santa Ana wind events, hot air from the desert blows into the Los Angeles basin and other coastal areas. Wind farms in these areas generate power from these winds; the other major weather factor in the region is elevation. The highest peak within the Mojave is Charleston Peak at 11,918 feet, while the Badwater Basin in Death Valley is 279 feet below sea level. Accordingly and precipitation ranges wildly in all seasons across the region.
The Mojave Desert has not supported a fire regime because of low fuel loads and connectivity. However, in the last few decades, invasive annual plants such as some within the genera Bromus and Brassica have facilitated fire; this has altered many areas of the desert. At higher elevations, fire regimes are infrequent; the Mojave Desert is defined by numerous mountain ranges creating its xeric conditions. These ranges create valleys, endorheic basins, salt pans, seasonal saline lakes when precipitation is high enough. These
United States Geological Survey
The United States Geological Survey is a scientific agency of the United States government. The scientists of the USGS study the landscape of the United States, its natural resources, the natural hazards that threaten it; the organization has four major science disciplines, concerning biology, geography and hydrology. The USGS is a fact-finding research organization with no regulatory responsibility; the USGS is a bureau of the United States Department of the Interior. The USGS employs 8,670 people and is headquartered in Reston, Virginia; the USGS has major offices near Lakewood, Colorado, at the Denver Federal Center, Menlo Park, California. The current motto of the USGS, in use since August 1997, is "science for a changing world." The agency's previous slogan, adopted on the occasion of its hundredth anniversary, was "Earth Science in the Public Service." Since 2012, the USGS science focus is directed at six topical "Mission Areas", namely Climate and Land Use Change, Core Science Systems, Ecosystems and Minerals and Environmental Health, Natural Hazards, Water.
In December 2012, the USGS split the Energy and Minerals and Environmental Health Mission Area resulting in seven topical Mission Areas, with the two new areas being: Energy and Minerals and Environmental Health. Administratively, it is divided into six Regional Units. Other specific programs include: Earthquake Hazards Program monitors earthquake activity worldwide; the National Earthquake Information Center in Golden, Colorado on the campus of the Colorado School of Mines detects the location and magnitude of global earthquakes. The USGS runs or supports several regional monitoring networks in the United States under the umbrella of the Advanced National Seismic System; the USGS informs authorities, emergency responders, the media, the public, both domestic and worldwide, about significant earthquakes. It maintains long-term archives of earthquake data for scientific and engineering research, it conducts and supports research on long-term seismic hazards. USGS has released the UCERF California earthquake forecast.
As of 2005, the agency is working to create a National Volcano Early Warning System by improving the instrumentation monitoring the 169 volcanoes in U. S. territory and by establishing methods for measuring the relative threats posed at each site. The USGS National Geomagnetism Program monitors the magnetic field at magnetic observatories and distributes magnetometer data in real time; the USGS collaborates with Canadian and Mexican government scientists, along with the Commission for Environmental Cooperation, to produce the North American Environmental Atlas, used to depict and track environmental issues for a continental perspective. The USGS operates the streamgaging network for the United States, with over 7400 streamgages. Real-time streamflow data are available online. National Climate Change and Wildlife Science Center implements partner-driven science to improve understanding of past and present land use change, develops relevant climate and land use forecasts, identifies lands and communities that are most vulnerable to adverse impacts of change from the local to global scale.
Since 1962, the Astrogeology Research Program has been involved in global and planetary exploration and mapping. In collaboration with Stanford University, the USGS operates the USGS-Stanford Ion Microprobe Laboratory, a world-class analytical facility for U--Pb geochronology and trace element analyses of minerals and other earth materials. USGS operates a number of water related programs, notably the National Streamflow Information Program and National Water-Quality Assessment Program. USGS Water data is publicly available from their National Water Information System database; the USGS operates the National Wildlife Health Center, whose mission is "to serve the nation and its natural resources by providing sound science and technical support, to disseminate information to promote science-based decisions affecting wildlife and ecosystem health. The NWHC provides information, technical assistance, research and leadership on national and international wildlife health issues." It is the agency responsible for surveillance of H5N1 avian influenza outbreaks in the United States.
The USGS runs 17 biological research centers in the United States, including the Patuxent Wildlife Research Center. The USGS is investigating collaboration with the social networking site Twitter to allow for more rapid construction of ShakeMaps; the USGS produces several national series of topographic maps which vary in scale and extent, with some wide gaps in coverage, notably the complete absence of 1:50,000 scale topographic maps or their equivalent. The largest and best-known topographic series is the 7.5-minute, 1:24,000 scale, quadrangle, a non-metric scale unique to the United States. Each of these maps covers an area bounded by two lines of latitude and two lines of longitude spaced 7.5 minutes apart. Nearly 57,000 individual maps in this series cover the 48 contiguous states, Hawaii, U. S. territories, areas of Alaska near Anchorage and Prudhoe Bay. The area covered by each map varies with the latitude of its represented location due to convergence of the meridians. At lower latitudes, near 30° north, a 7.5-minute quadrangle contains an area of about 64 square miles.
At 49° north latitude, 49 square miles are contained within a quadrangle of that size. As a unique non-metric map scale, the 1:24,000 scale requires a separate and specialized romer scale for pl
Needles is a city in San Bernardino County, United States. It lies on the western banks of the Colorado River in the Mohave Valley subregion of the Mojave Desert, near the borders of Arizona and Nevada and 110 miles from the Las Vegas Strip, it is the easternmost city of the San Bernardino-Riverside metropolitan area. Needles is geographically isolated from other cities in the county. Barstow, the nearest city within the county, is separated from Needles by over 140 miles of desert and 2 mountain ranges; the city is accessible via Interstate 40 and U. S. Route 95; the population was 4,844 at the 2010 census, up from 4,830 at the 2000 census. Needles was named after "The Needles", a group of pinnacles in the Mohave Mountains on the Arizona side of the river to the south of the city; the large Mohave Native American community shares the nearby Fort Mojave Indian Reservation and the town. Needles is a gateway to the Mojave National Preserve; the Mohave, one of the traditional Colorado River Indian Tribes, are Native Americans that have been living in the Mojave Valley area for thousands of years prior to the European exploration of the area.
In the Mohave language, they call themselves the ʼAha Makhav. Their name comes from two words: ʼaha, meaning "river", makhav, meaning "along" or "beside", to them it means "people who live along the river"; these people traded with the tribes of coastal Southern California following the Mohave Trail. The Franciscan missionary Francisco Garcés, was the first European to visit the Mohave people and travel on the trail and report on the route in 1776. From 1829 to 1848, part of this trail became a part of the route of the Old Spanish Trail between New Mexico and Southern California; the historic Mojave Road, now goes through the Mojave National Preserve following the route of the Mohave Trail. Along it, in 1859, Fort Mohave was built and the road established to protect new pioneer immigrants to California from New Mexico and other travelers from the Mohave during the Mohave War; the city was founded in May 1883 as a result of the construction of the Atchison and Santa Fe Railway, which crossed the Colorado River at Eastbridge, Arizona three miles southeast of modern downtown Needles.
The name was derived from the Needles, pointed mountain peaks at the south end of the valley with wind-blown holes in them, visible only by boat from the Colorado River. This point on the Colorado River was a poor site for such a bridge, lacking firm banks and a solid bottom. Additionally, the bridge was not of the best quality, which led to criticism that it was a "flimsy looking structure", was an obstruction to navigation, since it lacked a draw to allow boat traffic; the flooding and meandering of the Colorado River destroyed the bridge in 1884, 1886 and 1888. The railroad surrendered to nature and built the Red Rock Bridge, a high cantilever bridge, at a much narrower point with solid rock footings ten miles downstream near modern Topock; the bridge was completed in May 1890. A tent town for railroad construction crews, the railroad company built a hotel, car sheds, shops and a roundhouse. Within a month the town boasted a Chinese wash-house, a newsstand, a restaurant, a couple of general stores, nine or ten saloons.
The town became the largest port on the river above Arizona. The railway and the Fred Harvey Company built the elegant Neoclassical and Beaux-Arts style El Garces Hotel and Santa Fe Station in 1908, considered the "crown jewel" of the entire Fred Harvey chain; the landmark building is being restored. Needles was a major stop on the historic U. S. Route 66 highway from the 1920s through the 1960s. For immigrants from the Midwest Dust Bowl in the 1930s, it was the first town that marked their arrival in California; the city is lined with other shops from that era. The "Carty's Camp", which appears in The Grapes of Wrath as the Joad family enters California from Arizona, is now a ghost tourist court, its remains located behind the 1940s-era 66 Motel. In 1949, the United States Bureau of Reclamation began an extensive project to dredge a new channel for the Colorado River that would straighten out a river bend, causing serious silt problems since the Hoover Dam was completed. Needles is a tradition going back many decades.
The city is the eastern gateway to a scenic desert area. The city has a desert climate with a subtropical temperature range, with a mean annual temperature of 74.2 °F.. Needles, like Death Valley to the northwest, is known for extreme heat during the summer; the Needles weather station is reported by the United States government's National Oceanic and Atmospheric Administration as the site of the highest daily temperature recorded in the U. S. during the desert summers. Needles sets national or world daily temperature records, along with other related records associated with extreme desert heat. For instance, on July 22, 2006, Needles experienced a record high low temperature of 100 °F at 6:00 AM with a high temperature exceeding 120 °F, making it one of the few locations on Earth that have recorded a triple-digit overnight low temperature. On August 13, 2012, Needles experienced a thunderstorm that deposited rain at a temperature of 115 °F starting at 3:56 PM, setting a new record for the hottest rain in world history.
The air temperature was 118 °F. Since the humidity was only 11%, the rain evaporated so that "only a trace of precipitation was recorded in the rain gauge". Weather records researcher Maximiliano Herrera reported that this was the lowest
Lower Colorado River Valley
The Lower Colorado River Valley 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 Gulf of California 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/Arizona and Nevada/Arizona, between the Mexican states of Baja California/Sonora. It is defined as the region from below Hoover Dam and Lake Mead to its outlet at the northern Gulf of California, it is home to recreation activities from the river, the lakes created by dams and the home of various cities 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; some of the highest absolute air temperatures are recorded in the LCRV. Worldwide, only some deserts found in Africa and in the Middle East stand up with an hotter summer climate on average.
The LCRV is defined by three deserts. The Mojave Desert is in southeast California, southern Nevada, 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. The Lower Colorado River Valley is located in the north, northwestern Sonoran Desert; the LCRV extends about 350 miles from Hoover Dam to the Colorado River Delta. The Sonoran Desert itself is more than twice as extensive north-to-south, about 450 miles in width. Two species, Desert Ironwood- and the Lesser Long-nosed Bat, have geographic ranges identical to the Sonoran Desert, are indicator species of the Sonoran Desert region; the spring flowering of Ironwood, the bat species migration arrivals become indicators of annual or multi-year climate trends for regions of the Sonoran Desert. 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 – as a result of imported external resources, camping and camptrailers on BLM land.
Other threats include harvesting for fuelwood, etc. of desert ironwood, Olneya tesota, destruction of land by offroad vehicles in sand dunes, harvesting and manipulation of groundwater. Laughlin, Nevada in Clark County, Nevada Needles, California in San Bernardino County Bullhead City, Arizona Mojave Valley, Arizona Lake Havasu City, Arizona Vidal, California Parker, Arizona Blythe, California Quartzite, Arizona Winterhaven, California in Imperial County, California Yuma, Arizona in Yuma County, Arizona San Luis, Arizona San Luis Río Colorado, Sonora Rio Grande, the eastern river valley drainage of the Southwest USA Rio Grande Valley Category:Rio Grande Category:Fauna of the U. S. Rio Grande Valleys List of dams of the LCRV List of LCRV communities Little. Atlas of United States Trees, Volume 3, Minor Western Hardwoods, Elbert L, 1976, US Government Printing Office. Library of Congress No. 79-653298. Map 103, Olneya tesota. Journey of the Nectar Bats Map, Lesser Long-nosed Bat range. US Bureau of Reclamation, "Dams Along the Lower Colorado River"