The Parker Valley is located along the Lower Colorado River within the Lower Colorado River Valley region, in southwestern Arizona and southeastern California. Its natural habitats are within the Sonoran Colorado Desert ecoregions. Riparian zone habitats on the river include Mesquite Bosques; the river has supported irrigated agricultural conversion of the valley's landscape. Three major drainages of the Colorado River enter in the Parker Valley region; the Bill Williams River and Bouse Wash have confluences with the Colorado in the northern valley area, from watersheds on the east. Tyson Wash crosses the La Posa Plain and enters downstream, with its watershed east of the river in the Colorado River Indian Reservation. In California, the Vidal Valley and the Whipple Mountains border the Parker Valley on the northwest, the Palo Verde Valley on the southwest. In Arizona the Buckskin Mountains border the valley on the north, the Cactus Plain and Dome Rock Mountains border it on the east. Settlements within Parker Valley include: Parker and Poston in Arizona.
It is at the northern area of the Colorado River Indian Reservation on the Colorado River, is at the northern perimeter of the La Posa Plain. Valleys of the Lower Colorado River Valley U. S. Geological Survey Geographic Names Information System: Parker Valley Arizona Atlas & Gazetteer, DeLorme, c. 2002, p. 70
A siding, in rail terminology, is a low-speed track section distinct from a running line or through route such as a main line or branch line or spur. It may connect to other sidings at either end. Sidings have lighter rails, meant for lower speed or less heavy traffic, few, if any, signals. Sidings connected at both ends to a running line are known as loops. Sidings may be used for marshalling, storing and unloading vehicles. Common sidings store stationary rolling stock for loading and unloading. Industrial sidings go to factories, quarries, warehouses, some of them are links to industrial railways; such sidings can sometimes be found at stations for public use. Sidings may hold maintenance of way equipment or other equipment, allowing trains to pass, or store helper engines between runs; some sidings have occasional use, having been built, for example, to service an industry, a railway yard or a stub of a disused railway that has since closed. It is not uncommon for an infrequently-used siding to fall into disrepair.
A particular form of siding is passing loop. This is connected to it at both ends by switches. Passing sidings allow trains travelling in opposite directions to pass, for fast, high priority trains to pass slower or lower priority trains going the same direction, they are important for efficiency on single track lines, add to the capacity of other lines. Single-ended siding with similar purpose to passing loop. A team track is a small siding or spur track intended for the use of area merchants, manufacturers and other small businesses to load and unload products and merchandise in smaller quantities; the term "team" refers to the teams of horses or oxen delivering wagon-loads of freight transferred to or from railway cars. Team tracks may be owned by the railroad company or by customers served by the railroad, or by industrial parks or freight terminals that encompass many customers. In some jurisdictions, the operation and construction of team tracks is regulated by legal authorities. Earliest rail service to an area provided a team track on railroad-owned property adjacent to the railroad agent's train station.
As rail traffic became more established, large-volume shippers extended owned spur tracks into mines and warehouses. Small-volume shippers and shippers with facilities distant from the rail line continued using team tracks into the early part of the 20th century. Throughout the mid to latter portion of the 20th century, improved highway systems and abandonment of low-volume rail lines made full-distance truck shipments more practical in North America and avoided delays and damage associated with freight handling during transfer operations. However, as a result of higher fuel costs, greater traffic jams on Interstate Highways, the growing movement towards sustainable development, there has been recent upward trend towards moving long-distance freight traffic off highways and onto rail lines; this has resulted in local communities and rail lines seeking construction of new team track and intermodal facilities. Some railroads publish detailed specifications for the design and construction of many elements of team tracks.
For example, the Union Pacific Railroad has standards and guidelines for many aspects of spur track construction including track layout, clearance standards and turnout and switch stand designs. Team tracks do not have road or pedestrian crossings across them. Marshalling yard or classification yard Rail yard Jackson, Alan A.. The Railway Dictionary, 4th ed. Sutton Publishing, Stroud. ISBN 0-7509-4218-5. Ellis, Iain. Ellis' British Railway Engineering Encyclopaedia. Lulu.com. ISBN 978-1-8472-8643-7. Riley, Joseph E. and Strong, James C. "Basic Track", AREMA, 2003 Solomon, Brian, "Railway Signalling", 1st Edition, Voyageur Press
Sonora Estado Libre y Soberano de Sonora, is one of 31 states that, with Mexico City, comprise the 32 federal entities of United Mexican States. It is divided into 72 municipalities. Sonora is bordered by the states of Chihuahua to the east, Baja California to the northwest and Sinaloa to the south. To the north, it shares the U. S.–Mexico border with the states of Arizona and New Mexico, on the west has a significant share of the coastline of the Gulf of California. Sonora's natural geography is divided into three parts: the Sierra Madre Occidental in the east of the state, it is arid or semiarid deserts and grasslands, with only the highest elevations having sufficient rainfall to support other types of vegetation. Sonora is home to eight indigenous peoples, including the Mayo, the O’odham, the Yaqui, Seri, it has been economically important for its agriculture and mining since the colonial period, for its status as a border state since the Mexican–American War. With the Gadsden Purchase, Sonora lost more than a quarter of its territory.
From the 20th century to the present, industry and agribusiness have dominated the economy, attracting migration from other parts of Mexico. Several theories exist as to the origin of the name "Sonora". One theory states that the name was derived from Nuestra Señora, the name given to the territory when Diego de Guzmán crossed the Yaqui River on the day of Nuestra Señora del Rosario, which falls on 7 October with the pronunciation changing because none of the indigenous languages of the area have the ñ sound. Another theory states that Álvar Núñez Cabeza de Vaca and his companions, who had wrecked off the Florida coast and made their way across the continent, were forced to cross the arid state from north to south, carrying an image of Nuestra Señora de las Angustias on a cloth, they encountered the Opata, who could not pronounce Señora, instead saying Sonora. A third theory, written by Father Cristóbal de Cañas in 1730, states that the name comes from the word for a natural water well, which the Spaniards modified to "Sonora".
The first record of the name Sonora comes from explorer Francisco Vásquez de Coronado, who passed through the state in 1540 and called part of the area the Valle de la Sonora. Francisco de Ibarra traveled through the area in 1567 and referred to the Valles de Señora; the literal meaning of "sonora" in Spanish is "sonorous" or "loud." Evidence of human existence in the state dates back over 10,000 years, with some of the best-known remains at the San Dieguito Complex in the El Pinacate Desert. The first humans were nomadic hunter gatherers who used tools made from stones and wood. During much of the prehistoric period, the environmental conditions were less severe than they are today, with similar but more dense vegetation spread over a wider area; the oldest Clovis culture site in North America is believed to be El Fin del Mundo in northwestern Sonora. It was discovered during a 2007 survey, it features occupation dating around 13,390 calibrated years BP. In 2011, remains of Gomphothere were found.
Agriculture first appeared around 400 200 CE in the river valleys. Remains of ceramics have been found dating from 750 CE with diversification from 800 and 1300 CE Between 1100 and 1350, the region had complex small villages with well-developed trade networks; the lowland central coast, seems never to have adopted agriculture. Because Sonora and much of the northwest does not share many of the cultural traits of that area, it is not considered part of Mesoamerica. Though evidence exists of trade between the peoples of Sonora and Mesoamerica, Guasave in Sinaloa is the most north-westerly point considered Mesoamerican. Three archaeological cultures developed in the low, flat areas of the state near the coast: the Trincheras tradition, the Huatabampo tradition, the Central Coast tradition; the Trincheras tradition is dated to between 750 and 1450 CE and known from sites in the Altar and Concepción valleys, but its range extended from the Gulf of California into northern Sonora. The tradition is named after trenches found in a number of sites, the best known of, the Cerro de Trincheras.
The Huatabampo tradition is centered south of the Trincheras along the coast, with sites along extinct lagoons and river valleys. This tradition has a distinctive ceramic complex. Huatabampo culture shows similarities with the Chametla to the Hohokam to the north; this ended around 1000 CE. Unlike the other two traditions, the Central Coast remained a hunter-gatherer culture, as the area lacks the resources for agriculture; the higher elevations of the state were dominated by the Casas Grandes and Río Sonora tradition. The Río Sonora culture is located in central Sonora from the border area to modern Sinaloa. A beginning date for this culture has not been determined but it disappeared by the early 14th century; the Casas Grandes tradition in Sonora was an extension of the Río Sonora tradition based in the modern state of Chihuahua, which exterted its influence down to parts of the Sonoran coast. Climatic changes in the middle of the 15th century resulted in the increased desertification of northwest Mexico in general.
This is the probable cause for the drastic decrease in the number and size of settlements starting around this time. The peoples that remained in the area reverted to a less complex social organiz
California is a state in the Pacific Region of the United States. With 39.6 million residents, California is the most populous U. S. the third-largest by area. The state capital is Sacramento; the Greater Los Angeles Area and the San Francisco Bay Area are the nation's second and fifth most populous urban regions, with 18.7 million and 9.7 million residents respectively. Los Angeles is California's most populous city, the country's second most populous, after New York City. California has the nation's most populous county, Los Angeles County, its largest county by area, San Bernardino County; the City and County of San Francisco is both the country's second-most densely populated major city after New York City and the fifth-most densely populated county, behind only four of the five New York City boroughs. California's $3.0 trillion economy is larger than that of any other state, larger than those of Texas and Florida combined, the largest sub-national economy in the world. If it were a country, California would be the 5th largest economy in the world, the 36th most populous as of 2017.
The Greater Los Angeles Area and the San Francisco Bay Area are the nation's second- and third-largest urban economies, after the New York metropolitan area. The San Francisco Bay Area PSA had the nation's highest GDP per capita in 2017 among large PSAs, is home to three of the world's ten largest companies by market capitalization and four of the world's ten richest people. California is considered a global trendsetter in popular culture, innovation and politics, it is considered the origin of the American film industry, the hippie counterculture, fast food, the Internet, the personal computer, among others. The San Francisco Bay Area and the Greater Los Angeles Area are seen as global centers of the technology and entertainment industries, respectively. California has a diverse economy: 58% of the state's economy is centered on finance, real estate services and professional, scientific and technical business services. Although it accounts for only 1.5% of the state's economy, California's agriculture industry has the highest output of any U.
S. state. California is bordered by Oregon to the north and Arizona to the east, the Mexican state of Baja California to the south; the state's diverse geography ranges from the Pacific Coast in the west to the Sierra Nevada mountain range in the east, from the redwood–Douglas fir forests in the northwest to the Mojave Desert in the southeast. The Central Valley, a major agricultural area, dominates the state's center. Although California is well-known for its warm Mediterranean climate, the large size of the state results in climates that vary from moist temperate rainforest in the north to arid desert in the interior, as well as snowy alpine in the mountains. Over time and wildfires have become more pervasive features. What is now California was first settled by various Native Californian tribes before being explored by a number of European expeditions during the 16th and 17th centuries; the Spanish Empire claimed it as part of Alta California in their New Spain colony. The area became a part of Mexico in 1821 following its successful war for independence but was ceded to the United States in 1848 after the Mexican–American War.
The western portion of Alta California was organized and admitted as the 31st state on September 9, 1850. The California Gold Rush starting in 1848 led to dramatic social and demographic changes, with large-scale emigration from the east and abroad with an accompanying economic boom; the word California referred to the Baja California Peninsula of Mexico. The name derived from the mythical island California in the fictional story of Queen Calafia, as recorded in a 1510 work The Adventures of Esplandián by Garci Rodríguez de Montalvo; this work was the fifth in a popular Spanish chivalric romance series that began with Amadis de Gaula. Queen Calafia's kingdom was said to be a remote land rich in gold and pearls, inhabited by beautiful black women who wore gold armor and lived like Amazons, as well as griffins and other strange beasts. In the fictional paradise, the ruler Queen Calafia fought alongside Muslims and her name may have been chosen to echo the title of a Muslim leader, the Caliph. It's possible.
Know ye that at the right hand of the Indies there is an island called California close to that part of the Terrestrial Paradise, inhabited by black women without a single man among them, they lived in the manner of Amazons. They were robust of body with great virtue; the island itself is one of the wildest in the world on account of the craggy rocks. Shortened forms of the state's name include CA, Cal. Calif. and US-CA. Settled by successive waves of arrivals during the last 10,000 years, California was one of the most culturally and linguistically diverse areas in pre-Columbian North America. Various estimates of the native population range from 100,000 to 300,000; the Indigenous peoples of California included more than 70 distinct groups of Native Americans, ranging from large, settled populations living on the coast to groups in the interior. California groups were diverse in their political organization with bands, villages, on the resource-rich coasts, large chiefdoms, such as the Chumash and Salinan.
Trade, intermarriage a
The Grand Canyon is a steep-sided canyon carved by the Colorado River in Arizona, United States. The Grand Canyon is 277 miles long, up to 18 miles wide and attains a depth of over a mile; the canyon and adjacent rim are contained within Grand Canyon National Park, the Kaibab National Forest, Grand Canyon-Parashant National Monument, the Hualapai Indian Reservation, the Havasupai Indian Reservation and the Navajo Nation. President Theodore Roosevelt was a major proponent of preservation of the Grand Canyon area, visited it on numerous occasions to hunt and enjoy the scenery. Nearly two billion years of Earth's geological history have been exposed as the Colorado River and its tributaries cut their channels through layer after layer of rock while the Colorado Plateau was uplifted. While some aspects about the history of incision of the canyon are debated by geologists, several recent studies support the hypothesis that the Colorado River established its course through the area about 5 to 6 million years ago.
Since that time, the Colorado River has driven the down-cutting of the tributaries and retreat of the cliffs deepening and widening the canyon. For thousands of years, the area has been continuously inhabited by Native Americans, who built settlements within the canyon and its many caves; the Pueblo people considered the Grand Canyon a holy site, made pilgrimages to it. The first European known to have viewed the Grand Canyon was García López de Cárdenas from Spain, who arrived in 1540; the Grand Canyon is a river valley in the Colorado Plateau that exposes uplifted Proterozoic and Paleozoic strata, is one of the six distinct physiographic sections of the Colorado Plateau province. It is not the deepest canyon in the world. However, the Grand Canyon is known for its visually overwhelming size and its intricate and colorful landscape. Geologically, it is significant because of the thick sequence of ancient rocks that are well preserved and exposed in the walls of the canyon; these rock layers record much of the early geologic history of the North American continent.
Uplift associated with mountain formation moved these sediments thousands of feet upward and created the Colorado Plateau. The higher elevation has resulted in greater precipitation in the Colorado River drainage area, but not enough to change the Grand Canyon area from being semi-arid; the uplift of the Colorado Plateau is uneven, the Kaibab Plateau that Grand Canyon bisects is over one thousand feet higher at the North Rim than at the South Rim. All runoff from the North Rim flows toward the Grand Canyon, while much of the runoff on the plateau behind the South Rim flows away from the canyon; the result is deeper and longer tributary washes and canyons on the north side and shorter and steeper side canyons on the south side. Temperatures on the North Rim are lower than those on the South Rim because of the greater elevation. Heavy rains are common on both rims during the summer months. Access to the North Rim via the primary route leading to the canyon is limited during the winter season due to road closures.
The Grand Canyon is part of the Colorado River basin which has developed over the past 70 million years, in part based on apatite /He thermochronometry showing that Grand Canyon reached a depth near to the modern depth by 20 Ma. A recent study examining caves near Grand Canyon places their origins beginning about 17 million years ago. Previous estimates had placed the age of the canyon at 5–6 million years; the study, published in the journal Science in 2008, used uranium-lead dating to analyze calcite deposits found on the walls of nine caves throughout the canyon. There is a substantial amount of controversy because this research suggests such a substantial departure from prior supported scientific consensus. In December 2012, a study published in the journal Science claimed new tests had suggested the Grand Canyon could be as old as 70 million years. However, this study has been criticized by those who support the "young canyon" age of around six million years as " attempt to push the interpretation of their new data to their limits without consideration of the whole range of other geologic data sets."The canyon is the result of erosion which exposes one of the most complete geologic columns on the planet.
The major geologic exposures in the Grand Canyon range in age from the 2-billion-year-old Vishnu Schist at the bottom of the Inner Gorge to the 230-million-year-old Kaibab Limestone on the Rim. There is a gap of about a billion years between the 500-million-year-old stratum and the level below it, which dates to about 1.5 billion years ago. This large unconformity indicates a long period. Many of the formations were deposited in warm shallow seas, near-shore environments, swamps as the seashore advanced and retreated over the edge of a proto-North America. Major exceptions include the Permian Coconino Sandstone, which contains abundant geological evidence of aeolian sand dune deposition. Several parts of the Supai Group were deposited in non–marine environments; the great depth of the Grand Canyon and the height of its strata can be attributed to 5–10 thousand feet of uplift of the Colorado Plateau, starting about 65 million years ago. This uplift has steepened the stream gradient of the Colorado River
The Colorado Plateau known as the Colorado Plateau Province, is a physiographic and desert region of the Intermontane Plateaus centered on the Four Corners region of the southwestern United States. This province covers an area of 336, 700 km2 within western Colorado, northwestern New Mexico and eastern Utah, northern Arizona. About 90% of the area is drained by the Colorado River and its main tributaries: the Green, San Juan, Little Colorado. Most of the remainder of the plateau is drained by its tributaries; the Colorado Plateau is made up of high desert, with scattered areas of forests. In the southwest corner of the Colorado Plateau lies the Grand Canyon of the Colorado River. Much of the Plateau's landscape is related, in both appearance and geologic history, to the Grand Canyon; the nickname "Red Rock Country" suggests the brightly colored rock left bare to the view by dryness and erosion. Domes, fins, river narrows, natural bridges, slot canyons are only some of the additional features typical of the Plateau.
The Colorado Plateau has the greatest concentration of U. S. National Park Service units in the country outside the Washington, DC metropolitan area. Among its nine National Parks are Grand Canyon, Bryce Canyon, Capitol Reef, Arches, Mesa Verde, Petrified Forest. Among its 18 National Monuments are Bears Ears, Rainbow Bridge, Hovenweep, Sunset Crater Volcano, Grand Staircase-Escalante, Natural Bridges, Canyons of the Ancients, Chaco Culture National Historical Park and the Colorado National Monument; this province is bounded by the Rocky Mountains in Colorado, by the Uinta Mountains and Wasatch Mountains branches of the Rockies in northern and central Utah. It is bounded by the Rio Grande Rift, Mogollon Rim and the Basin and Range Province. Isolated ranges of the Southern Rocky Mountains such as the San Juan Mountains in Colorado and the La Sal Mountains in Utah intermix into the central and southern parts of the Colorado Plateau, it is composed of six sections: Uinta Basin Section High Plateaus Section Grand Canyon Section Canyon Lands Section Navajo Section Datil SectionAs the name implies, the High Plateaus Section is, on average, the highest section.
North-south trending normal faults that include the Hurricane, Grand Wash, Paunsaugunt separate the section's component plateaus. This fault pattern is caused by the tensional forces pulling apart the adjacent Basin and Range province to the west, making this section transitional. Occupying the southeast corner of the Colorado Plateau is the Datil Section. Thick sequences of mid-Tertiary to late-Cenozoic-aged lava covers this section. Development of the province has in large part been influenced by structural features in its oldest rocks. Part of the Wasatch Line and its various faults form the western edge of the province. Faults that run parallel to the Wasatch Fault that lies along the Wasatch Range form the boundaries between the plateaus in the High Plateaus Section; the Uinta Basin, Uncompahgre Uplift, the Paradox Basin were created by movement along structural weaknesses in the region's oldest rock. In Utah, the province includes several higher fault-separated plateaus: Awapa Plateau Aquarius Plateau Kaiparowits Plateau Markagunt Plateau Paunsaugunt Plateau Sevier Plateau Fishlake Plateau Pavant Plateau Gunnison Plateau and the Tavaputs Plateau.
Some sources include the Tushar Mountain Plateau as part of the Colorado Plateau, but others do not. The flat-lying sedimentary rock units that make up these plateaus are found in component plateaus that are between 4,900 to 11,000 feet above sea level. A supersequence of these rocks is exposed in the various cliffs and canyons that make up the Grand Staircase. Younger east-west trending escarpments of the Grand Staircase extend north of the Grand Canyon and are named for their color: Chocolate Cliffs, Vermillion Cliffs, White Cliffs, Gray Cliffs, the Pink Cliffs. Within these rocks are abundant mineral resources that include uranium, coal and natural gas. Study of the area's unusually clear geologic history has advanced that science. A rain shadow from the Sierra Nevada far to the west and the many ranges of the Basin and Range means that the Colorado Plateau receives six to sixteen inches of annual precipitation. Higher areas receive more precipitation and are covered in forests of pine and spruce.
Though it can be said that the Plateau centers on the Four Corners, Black Mesa in northern Arizona is much closer to the east-west, north-south midpoint of the Plateau Province. Lying southeast of Glen Canyon and southwest of Monument Valley at the north end of the Hopi Reservation, this remote coal-laden highland has about half of the Colorado Plateau's acreage north of it, half south of it, half west of it, half east of it; the Ancestral Puebloan People lived in the region from 2000 to 700 years ago. A party from Santa Fe led by Fathers Dominguez and Escalante, unsuccessfully seeking an overland route to California, made a five-month out-and-back trip through much of the Plateau in 1776-1777. Despite having lost one arm in the American Civil War, U. S. Army Major and geologist John Wesley Powell explored the area in 1869 and 1872. Using wooden oak boats and small groups of men the Powell Geographic Expedition charted this unknown region of the United States for the federal government. Construction of the Hoover Dam in the 1930s and the Glen Canyon Dam in the 1960s changed the character of the Colorado River.
Reduced sediment load changed its color from reddish brown t
Grand Junction, Colorado
Grand Junction is a home rule municipality, the county seat and the most populous municipality of Mesa County, United States. The city has a council–manager form of government, is the most populous municipality in all of western Colorado. Grand Junction is 247 miles west-southwest of the Colorado State Capitol in Denver; as of the 2010 census, the city's population was 58,566. Grand Junction is the 15th most populous city in the state of Colorado and the most populous city on the Colorado Western Slope, it is a major commercial and transportation hub within the large area between the Green River and the Continental Divide. It is the principal city of the Grand Junction Metropolitan Statistical Area, which had a population of 146,723 in 2010 census; the city is along the Colorado River, at its confluence with the Gunnison River, which comes in from the south. "Grand" refers to the historical Grand River. "Junction" refers to the confluence of the Gunnison rivers. Grand Junction has been nicknamed "River City".
It is near the midpoint of a 30-mile arcing valley, known as the Grand Valley. The valley was long occupied by earlier indigenous cultures, it was not settled by European-American farmers until the 1880s. Since the late 20th century, several wineries have been established in the area; the Colorado National Monument, a unique series of canyons and mesas, overlooks the city on the west. Most of the area is surrounded by federal public lands managed by the US Bureau of Land Management; the Book Cliffs are a prominent series of cliffs. Interstate 70 connects the city eastward to Glenwood Springs and Denver and westward to Green River, Utah. S Route 6; the Country Jam Ranch, near Grand Junction just north of I-70 at the Mack exit, is a permanent festival site built for music festivals, including Country Jam. This event has been held annually since 1992; the Grand Junction area has developed as a mountain biking destination, with many bikers coming from the Front Range of Colorado, the Salt Lake City area, as far away as California to enjoy the area's abundant single-track trails.
Two prominent trails are the Tabeguache and Kokopelli trails, the latter running from near Loma to Moab, Utah. Fruita, with its 18-Road trail system, is within 10 miles of the city and has become a major mountain biking destination. In September 1881 the former Ute Indian Territory was abolished and the Utes removed to a reservation so that the U. S. government could open the area to white settlers. Clinton County, Pennsylvania-born George Addison Crawford soon purchased a plot of land. On July 22, 1882, he incorporated the town of Grand Junction and planted Colorado's first vineyard near Palisade, causing the area to become known as the Colorado Wine Country. Grand Junction has a storied past with gunfighters and early settlers of the American Southwest; the infamous "Doc" Holliday was buried in Grand Junction Cemetery after his death from "consumption", as Grand Junction was one of his favorite places before he began living full-time at the sanatorium in Glenwood Springs, Colorado. According to the United States Census Bureau, the city has a total area of 38.6 square miles, with 38.2 square miles of it land, 0.39 square miles, or 0.87% of it water.
The downtown area displays a semi-arid climate grading into an arid type. Grand Junction sits in a large area of high desert lands in Western Colorado. Winters are cold and dry, with a January mean temperature of 27.4 °F. Due to its location west of the Rockies, Grand Junction does not receive as much influence from the Chinook winds as locations in Colorado east of the Front Range, yet it does receive protection from the Arctic masses that can settle to the east of the Rockies; this is illustrated by the fact. Lows drop below on 2.9 nights per year. Snowfall is low compared to much of the rest of the state, averaging 19.1 inches per season. Snow is greatest in January. Spring warming is quickens when nearing June. Summer is hot but dry, with a July mean temperature of 78.2 °F. Grand Junction averages 64.5 days a year with temperatures at 90 °F or above, an average 6.5 days attaining 100 °F or more. Autumn cooling is rapid, with the average first freeze date being October 15; the area receives little precipitation year-round, averaging 9.42 inches, with no real seasonal spike.
Sunshine hours are abundant in winter, total just over 3200 hours per year, or 73% of the possible total. According to the census.gov website the estimate population as of July 1, 2017 is 62,475 people. As of the census of 2000, there were 41,986 people, 17,865 households, 10,540 families residing in the city; the population density was 1,362.6 people per square mile. There were 18,784 housing units at an average density of 609.6 per square mile. The racial makeup of the city was 91.78% White, 0.60% African American, 0.94% Native American, 0.76% Asian, 0.12% Pacific Islander, 3.81% from other races, 1.99% from two or more races. Hispanic or Lati