Arches National Park
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Arches National Park is a
national park A national park is a nature park, natural park in use for conservation (ethic), conservation purposes, created and protected by national governments. Often it is a reserve of natural, semi-natural, or developed land that a sovereign state dec ...
in eastern
Utah Utah ( , ) is a state in the Mountain West subregion of the Western United States. Utah is a landlocked U.S. state bordered to its east by Colorado, to its northeast by Wyoming, to its north by Idaho, to its south by Arizona, and to it ...
, United States. The park is adjacent to the
Colorado River The Colorado River ( es, Río Colorado) is one of the principal rivers (along with the Rio Grande) in the Southwestern United States and northern Mexico. The river drains an expansive, arid drainage basin, watershed that encompasses parts of ...
, north of
Moab, Utah Moab () is the largest city and county seat of Grand County in eastern Utah in the western United States, known for its dramatic scenery. The population was 5,366 at the 2020 census. Moab attracts many tourists annually, mostly visitors to th ...
. More than 2,000 natural sandstone arches are located in the park, including the well-known
Delicate Arch Delicate Arch is a freestanding natural arch located in Arches National Park, near Moab, Utah, Moab in Grand County, Utah, Grand County, Utah, United States. The arch is the most widely recognized landmark in Arches National Park and is depicted ...
, as well as a variety of unique geological resources and formations. The park contains the highest density of natural arches in the world. The park consists of of high desert located on the
Colorado Plateau The Colorado Plateau, also known as the Colorado Plateau Province, is a physiographic and desert region of the Intermontane Plateaus, roughly centered on the Four Corners region of the southwestern United States. This province covers an area of ...
. The highest elevation in the park is at Elephant Butte, and the lowest elevation is at the visitor center. The park receives an average of less than of rain annually. Administered by the
National Park Service The National Park Service (NPS) is an agency of the United States federal government within the U.S. Department of the Interior that manages all national parks, most national monuments, and other natural, historical, and recreational propertie ...
, the area was originally named a
national monument A national monument is a monument constructed in order to commemorate something of importance to national heritage, such as a country's founding, independence, war, or the life and death of a historical figure. The term may also refer to a spec ...
on April 12, 1929, and was redesignated as a national park on November 12, 1971. The park received more than 1.6 million visitors in 2018.


Park purpose

As stated in the foundation document in U.S. National Park Service website:


Geology

The national park lies above an underground
evaporite An evaporite () is a water-soluble sedimentary mineral deposit that results from concentration and crystallization by evaporation from an aqueous solution. There are two types of evaporite deposits: marine, which can also be described as ocea ...
layer or
salt Salt is a mineral composed primarily of sodium chloride (NaCl), a chemical compound belonging to the larger class of salts; salt in the form of a natural crystalline mineral is known as rock salt or halite. Salt is present in vast quantitie ...
bed, which is the main cause of the formation of the arches, spires, balanced rocks,
sandstone Sandstone is a clastic sedimentary rock composed mainly of sand-sized (0.0625 to 2 mm) silicate grains. Sandstones comprise about 20–25% of all sedimentary rocks. Most sandstone is composed of quartz or feldspar (both silicates) ...
fins A fin is a thin component or appendage attached to a larger body or structure. Fins typically function as foils that produce lift or thrust, or provide the ability to steer or stabilize motion while traveling in water, air, or other fluids. Fin ...
, and eroded monoliths in the area. This salt bed is thousands of feet thick in places and was deposited in the
Paradox Basin The Paradox Basin is an asymmetric foreland basin located mostly in southeast Utah and southwest Colorado, but extending into northeast Arizona and northwest New Mexico. The basin is a large elongate northwest to southeast oriented depression for ...
of the
Colorado Plateau The Colorado Plateau, also known as the Colorado Plateau Province, is a physiographic and desert region of the Intermontane Plateaus, roughly centered on the Four Corners region of the southwestern United States. This province covers an area of ...
some 300 million years ago (Mya) when a sea flowed into the region and eventually evaporated. Over millions of years, the salt bed was covered with debris eroded from the Uncompahgre Uplift to the northeast. During the Early
Jurassic The Jurassic ( ) is a Geological period, geologic period and System (stratigraphy), stratigraphic system that spanned from the end of the Triassic Period million years ago (Mya) to the beginning of the Cretaceous Period, approximately Mya. The J ...
(about 200 Mya), desert conditions prevailed in the region and the vast
Navajo Sandstone The Navajo Sandstone is a geological formation in the Glen Canyon Group that is spread across the U.S. states of southern Nevada, northern Arizona, northwest Colorado, and Utah as part of the Colorado Plateau province of the United States.Anonymou ...
was deposited. An additional sequence of stream laid and windblown sediments, the
Entrada Sandstone The Entrada Sandstone is a formation in the San Rafael Group found in the U.S. states of Wyoming, Colorado, northwest New Mexico, northeast Arizona, and southeast Utah. Part of the Colorado Plateau, this formation was deposited during the Jur ...
(about 140 Mya), was deposited on top of the Navajo. Over 5,000 feet (1,500 m) of younger sediments were deposited and have been mostly eroded. Remnants of the cover exist in the area including exposures of the
Cretaceous The Cretaceous ( ) is a geological period that lasted from about 145 to 66 million years ago (Mya). It is the third and final period of the Mesozoic Era, as well as the longest. At around 79 million years, it is the longest geological period of th ...
Mancos Shale The Mancos Shale or Mancos Group is a Late Cretaceous (Upper Cretaceous) geologic formation of the Western United States. The Mancos Shale was first described by Cross and Purington in 1899 and was named for exposures near the town of Mancos, ...
. The arches of the area are developed mostly within the Entrada formation. The weight of this cover caused the salt bed below it to liquefy and thrust up layers of rock into
salt dome A salt dome is a type of structural dome formed when salt (or other evaporite minerals) intrudes into overlying rocks in a process known as diapirism. Salt domes can have unique surface and subsurface structures, and they can be discovered using ...
s. The evaporites of the area formed more unusual "salt
anticline In structural geology, an anticline is a type of fold that is an arch-like shape and has its oldest beds at its core, whereas a syncline is the inverse of an anticline. A typical anticline is convex up in which the hinge or crest is the ...
s" or linear regions of uplift.
Faulting In geology, a fault is a planar fracture or discontinuity in a volume of rock across which there has been significant displacement as a result of rock-mass movements. Large faults within Earth's crust result from the action of plate tectonic ...
occurred and whole sections of rock subsided into the areas between the domes. In some places, they turned almost on edge. The result of one such displacement, the
Moab Fault The Moab Fault, near Moab, Utah, United States, is an extensional fault that runs approximately NW-SE, passing to the west of the Arches National Park. It is about long and has a maximum displacement of about . The fault connects with the Tenmile ...
, is seen from the visitor center. As this subsurface movement of salt shaped the landscape,
erosion Erosion is the action of surface processes (such as water flow or wind) that removes soil, rock, or dissolved material from one location on the Earth's crust, and then transports it to another location where it is deposited. Erosion is distin ...
removed the younger rock layers from the surface. Except for isolated remnants, the major formations visible in the park today are the salmon-colored Entrada Sandstone, in which most of the arches form, and the buff-colored Navajo Sandstone. These are visible in layer-cake fashion throughout most of the park. Over time, water seeped into the surface cracks, joints, and folds of these layers. Ice formed in the fissures, expanding and putting pressure on surrounding rock, breaking off bits and pieces. Winds later cleaned out the loose particles. A series of free-standing fins remained. Wind and water attacked these fins until, in some, the cementing material gave way and chunks of rock tumbled out. Many damaged fins collapsed. Others, with the right degree of hardness and balance, survived despite their missing sections. These became the famous arches. Although the park's terrain may appear rugged and durable, it is extremely fragile. More than 1 million visitors each year threaten the fragile high-desert ecosystem. The problem lies within the soil's crust, which is composed of
cyanobacteria Cyanobacteria (), also known as Cyanophyta, are a phylum of gram-negative bacteria that obtain energy via photosynthesis. The name ''cyanobacteria'' refers to their color (), which similarly forms the basis of cyanobacteria's common name, blu ...
, algae, fungi, and lichens that grow in the dusty parts of the park. Factors that make Arches National Park sensitive to visitor damage include being a semiarid region, the scarce, unpredictable rainfall, lack of deep freezing, and lack of plant litter, which results in soils that have both a low resistance to and slow recovery from, compressional forces such as foot traffic. Methods of indicating effects on the soil are cytophobic soil crust index, measuring of water infiltration, and t-tests that are used to compare the values from the undisturbed and disturbed areas.


Arches National Park


Arch Formation

Geological processes that occurred over 300 million years ago caused a salt bed to be deposited, which today lies beneath the landscape of Arches National Park. Over time, the salt bed was covered with
sediment Sediment is a naturally occurring material that is broken down by processes of weathering and erosion, and is subsequently transported by the action of wind, water, or ice or by the force of gravity acting on the particles. For example, sand an ...
s that eventually compressed into rock layers that have since been named Entrada Standstone. Rock layers surrounding the edge of the salt bed continued to erode and shift into vertical sandstone walls called fins. Sand collected between vertical walls of the fins, then slightly acidic rain combined with
carbon dioxide Carbon dioxide (chemical formula ) is a chemical compound made up of molecules that each have one carbon atom covalently double bonded to two oxygen atoms. It is found in the gas state at room temperature. In the air, carbon dioxide is transpar ...
in the air allowed for the chemical formation of carbonic acid within the trapped sand. Over time, the carbonic acid dissolved the calcium carbonate that held the
sandstone Sandstone is a clastic sedimentary rock composed mainly of sand-sized (0.0625 to 2 mm) silicate grains. Sandstones comprise about 20–25% of all sedimentary rocks. Most sandstone is composed of quartz or feldspar (both silicates) ...
together. Many of the
rock formations A rock formation is an isolated, scenic, or spectacular surface rock outcrop. Rock formations are usually the result of weathering and erosion sculpting the existing rock. The term ''rock formation'' can also refer to specific sediment ...
have weaker layers of rock on bottom that are holding stronger layers on top. The weaker layers would dissolve first, creating openings in the rock.
Gravity In physics, gravity () is a fundamental interaction which causes mutual attraction between all things with mass or energy. Gravity is, by far, the weakest of the four fundamental interactions, approximately 1038 times weaker than the stro ...
caused pieces of the stronger rock layer to fall piece by piece into an arch shape.
Arch An arch is a vertical curved structure that spans an elevated space and may or may not support the weight above it, or in case of a horizontal arch like an arch dam, the hydrostatic pressure against it. Arches may be synonymous with vaul ...
es form within rock fins at points of intense fracturing localization, or weak points in the rock's formation, caused by horizontal and vertical discontinuities. Lastly, water, wind, and time continued this
erosion Erosion is the action of surface processes (such as water flow or wind) that removes soil, rock, or dissolved material from one location on the Earth's crust, and then transports it to another location where it is deposited. Erosion is distin ...
process and ultimately created the arches of Arches National Park. All of the arches in the park are made of Entrada Sandstone, however, there are slight differences in how each arch was developed. This allows the Entrada Sandstone to be categories into 3 groups including Slick rock members, Dewey rock members, and Moab members. Vertical arches can be developed from Slick rock members, a combination of Slick rock members and Moab members, or Slick rock members resting above Dewey rock members. Horizontal arches (also called potholes) are formed when a vertical pothole formation meets a horizontal
cave A cave or cavern is a natural void in the ground, specifically a space large enough for a human to enter. Caves often form by the weathering of rock and often extend deep underground. The word ''cave'' can refer to smaller openings such as sea ...
, causing a union into a long arch structure. The erosion process within Arches National Park will continue as time continues to pass. Continued erosion combined with vertical and horizontal stress will eventually cause arches to collapse, but still, new arches will continue to form for thousands of years.


Climate

According to the
Köppen climate classification The Köppen climate classification is one of the most widely used climate classification systems. It was first published by German-Russian climatologist Wladimir Köppen (1846–1940) in 1884, with several later modifications by Köppen, notabl ...
system, Arches Visitor Center has a
cold semi-arid climate A semi-arid climate, semi-desert climate, or steppe climate is a dry climate sub-type. It is located on regions that receive precipitation below potential evapotranspiration, but not as low as a desert climate. There are different kinds of semi-ar ...
(''BSk'').


History

Humans have occupied the region since the last
ice age An ice age is a long period of reduction in the temperature of Earth's surface and atmosphere, resulting in the presence or expansion of continental and polar ice sheets and alpine glaciers. Earth's climate alternates between ice ages and gree ...
10,000 years ago.
Fremont people The Fremont culture or Fremont people is a pre-Columbian archaeological culture which received its name from the Fremont River in the U.S. state of Utah, where the culture's sites were discovered by local indigenous peoples like the Navajo and ...
and
Ancestral Puebloans The Ancestral Puebloans, also known as the Anasazi, were an ancient Native American culture that spanned the present-day Four Corners region of the United States, comprising southeastern Utah, northeastern Arizona, northwestern New Mexico, a ...
lived in the area until about 700 years ago. Spanish missionaries encountered
Ute Ute or UTE may refer to: * Ute (band), an Australian jazz group * Ute (given name) * ''Ute'' (sponge), a sponge genus * Ute (vehicle), an Australian and New Zealand term for certain utility vehicles * Ute, Iowa, a city in Monona County along ...
and
Paiute Paiute (; also Piute) refers to three non-contiguous groups of indigenous peoples of the Great Basin. Although their languages are related within the Numic group of Uto-Aztecan languages, these three groups do not form a single set. The term "Pai ...
tribes in the area when they first came through in 1775, but the first European-Americans to attempt settlement in the area were the
Mormon Mormons are a religious and cultural group related to Mormonism, the principal branch of the Latter Day Saint movement started by Joseph Smith in upstate New York during the 1820s. After Smith's death in 1844, the movement split into several ...
Elk Mountain Mission in 1855, who soon abandoned the area. Ranchers, farmers, and prospectors later settled Moab in the neighboring Riverine Valley in the late 1870s. Word of the beauty of the surrounding
rock formation A rock formation is an isolated, scenic, or spectacular surface rock outcrop. Rock formations are usually the result of weathering and erosion sculpting the existing rock. The term ''rock formation'' can also refer to specific sediment ...
s spread beyond the settlement as a possible
tourist Tourism is travel for pleasure or business; also the theory and practice of touring, the business of attracting, accommodating, and entertaining tourists, and the business of operating tours. The World Tourism Organization defines tourism mo ...
destination. The Arches area was first brought to the attention of the National Park Service by Frank A. Wadleigh, passenger traffic manager of the
Denver and Rio Grande Western Railroad The Denver & Rio Grande Western Railroad , often shortened to ''Rio Grande'', D&RG or D&RGW, formerly the Denver & Rio Grande Railroad, was an American Class I railroad company. The railroad started as a narrow-gauge line running south from De ...
. Wadleigh, accompanied by railroad photographer George L. Beam, visited the area in September 1923 at the invitation of Alexander Ringhoffer, a Hungarian-born
prospector Prospector may refer to: Space exploration * Prospector (spacecraft), a planned lunar probe, canceled in 1962 * ''Lunar Prospector'', a NASA spacecraft Trains * Prospector (train), a passenger train operated by the Denver & Rio Grande Western ra ...
living in Salt Valley. Ringhoffer had written to the railroad to interest them in the tourist potential of a scenic area he had discovered the previous year with his two sons and a son-in-law, which he called the Devils Garden (known today as the Klondike Bluffs). Wadleigh was impressed by what Ringhoffer showed him, and suggested to Park Service director Stephen T. Mather that the area be made a national monument. The following year, additional support for the monument idea came from
Laurence Gould Laurence McKinley Gould (August 22, 1896 – June 21, 1995) was an American geologist, educator, and polar explorer. He made expeditions to both the Arctic and Antarctic, and was chief scientist on Richard Evelyn Byrd's first Antarctic expeditio ...
, a
University of Michigan , mottoeng = "Arts, Knowledge, Truth" , former_names = Catholepistemiad, or University of Michigania (1817–1821) , budget = $10.3 billion (2021) , endowment = $17 billion (2021)As o ...
graduate student (and future polar explorer) studying the
geology Geology () is a branch of natural science concerned with Earth and other astronomical objects, the features or rocks of which it is composed, and the processes by which they change over time. Modern geology significantly overlaps all other Ear ...
of the nearby
La Sal Mountains The La Sal Mountains or La Sal Range are a mountain range located in Grand and San Juan counties in the U.S. state of Utah, along the border with Colorado. The range rises above and southeast of Moab and north of the town of La Sal. This range ...
, who was shown the scenic area by local physician Dr. J. W. "Doc" Williams. A succession of government investigators examined the area, in part due to confusion as to the precise location. In the process, the name Devils Garden was transposed to an area on the opposite side of Salt Valley that includes
Landscape Arch Landscape Arch is the longest of the many natural rock arches located in Arches National Park, Utah, United States and among the longest natural stone arches in the world. Description The arch is among many in the Devils Garden area in the nor ...
, the longest arch in the park. Ringhoffer's original discovery was omitted, while another area nearby, known locally as the Windows, was included. Designation of the area as a national monument was supported by the Park Service in 1926 but was resisted by President
Calvin Coolidge Calvin Coolidge (born John Calvin Coolidge Jr.; ; July 4, 1872January 5, 1933) was the 30th president of the United States from 1923 to 1929. Born in Vermont, Coolidge was a History of the Republican Party (United States), Republican lawyer ...
's Interior Secretary,
Hubert Work Hubert Work (July 3, 1860December 14, 1942) was a U.S. administrator and physician. He served as the United States Postmaster General from 1922 until 1923 during the presidency of Warren G. Harding. He served as the United States Secretary of t ...
. Finally, in April 1929, shortly after his inauguration, President
Herbert Hoover Herbert Clark Hoover (August 10, 1874 – October 20, 1964) was an American politician who served as the 31st president of the United States from 1929 to 1933 and a member of the Republican Party, holding office during the onset of the Gr ...
signed a presidential proclamation creating the Arches National Monument, consisting of two comparatively small, disconnected sections. The purpose of the reservation under the 1906
Antiquities Act The Antiquities Act of 1906 (, , ), is an act that was passed by the United States Congress and signed into law by Theodore Roosevelt on June 8, 1906. This law gives the President of the United States the authority to, by presidential procla ...
was to protect the arches, spires, balanced rocks, and other sandstone formations for their scientific and educational value. The name Arches was suggested by Frank Pinkely, superintendent of the Park Service's southwestern national monuments, following a visit to the Windows section in 1925. In late 1938, President
Franklin D. Roosevelt Franklin Delano Roosevelt (; ; January 30, 1882April 12, 1945), often referred to by his initials FDR, was an American politician and attorney who served as the 32nd president of the United States from 1933 until his death in 1945. As the ...
signed a proclamation that enlarged the Arches to protect additional scenic features and permit the development of facilities to promote tourism. A small adjustment was made by President
Dwight Eisenhower Dwight David "Ike" Eisenhower (born David Dwight Eisenhower; ; October 14, 1890 – March 28, 1969) was an American military officer and statesman who served as the 34th president of the United States from 1953 to 1961. During World War II, ...
in 1960 to accommodate a new road alignment. In early 1969, just before leaving office, President
Lyndon B. Johnson Lyndon Baines Johnson (; August 27, 1908January 22, 1973), often referred to by his initials LBJ, was an American politician who served as the 36th president of the United States from 1963 to 1969. He had previously served as the 37th vice ...
signed a proclamation substantially enlarging the Arches. Two years later, President
Richard Nixon Richard Milhous Nixon (January 9, 1913April 22, 1994) was the 37th president of the United States, serving from 1969 to 1974. A member of the Republican Party, he previously served as a representative and senator from California and was ...
signed legislation enacted by
Congress A congress is a formal meeting of the representatives of different countries, constituent states, organizations, trade unions, political parties, or other groups. The term originated in Late Middle English to denote an encounter (meeting of a ...
, which significantly reduced the total area enclosed, but changed its status. Arches National Park was formally dedicated in May 1972 In 1980, vandals attempted to use an abrasive kitchen cleanser to deface ancient
petroglyph A petroglyph is an image created by removing part of a rock surface by incising, picking, carving, or abrading, as a form of rock art. Outside North America, scholars often use terms such as "carving", "engraving", or other descriptions ...
s in the park, prompting park officials to recruit physicist John F. Asmus, who specialized in using lasers to restore works of art, to use his technology to repair the damage. Asmus "zapped the panel with intense light pulses and succeeded in removing most of the cleanser".


Recreational activities

Climbing
Balanced Rock Balanced Rock is one of the most popular features of Arches National Park, situated in Grand County, Utah, United States. Balanced Rock is located next to the park's main road, at about 9.2 miles (14.8 km) from the park entrance. It is on ...
or any named or unnamed arch in Arches National Park with an opening larger than is banned by park regulations. Climbing on other features in the park is allowed but regulated; in addition,
slacklining Slacklining refers to the act of walking, running or balancing along a suspended length of flat webbing that is tensioned between two anchors. Slacklining is similar to slack rope walking and tightrope walking. Slacklines differ from tightwir ...
and BASE jumping are banned parkwide. Climbing on named arches within the park had long been banned by park regulations, but following
Dean Potter Dean Spaulding Potter (April 14, 1972 – May 16, 2015) was an American free climber, alpinist, BASE jumper, and highliner. He completed many hard first ascents, free solo ascents, speed ascents, and enchainments in Yosemite National Park an ...
's successful
free climb Free climbing is a form of rock climbing in which the climber may use climbing equipment such as ropes and other means of climbing protection, but only to protect against injury during falls and not to assist vertical or horizontal progress. The ...
on
Delicate Arch Delicate Arch is a freestanding natural arch located in Arches National Park, near Moab, Utah, Moab in Grand County, Utah, Grand County, Utah, United States. The arch is the most widely recognized landmark in Arches National Park and is depicted ...
in May 2006, the wording of the regulations was deemed unenforceable by the park
attorney Attorney may refer to: * Lawyer ** Attorney at law, in some jurisdictions * Attorney, one who has power of attorney * ''The Attorney'', a 2013 South Korean film See also * Attorney general, the principal legal officer of (or advisor to) a gove ...
. In response, the park revised its regulations later that month, eventually imposing the current ban on arch climbing in 2014. Approved recreational activities include auto touring, hiking, bicycling, camping at the Devils Garden campground, backpacking,
canyoneering Canyoning (canyoneering in the United States, kloofing in South Africa) is a type of mountaineering that involves travelling in canyons using a variety of techniques that may include other outdoor activities such as walking, scrambling, climb ...
, and rock climbing, with permits required for the last three activities. Guided commercial tours and ranger programs are also available. Astronomy is also popular in the park due to its dark skies, despite the increasing
light pollution Light pollution is the presence of unwanted, inappropriate, or excessive use of artificial Visible spectrum, lighting. In a descriptive sense, the term ''light pollution'' refers to the effects of any poorly implemented lighting, during the day ...
from towns such as Moab.


Publicity

Delicate Arch is the subject of the third 2014 quarter of the U.S. Mint's America the Beautiful Quarters program commemorating national parks and historic sites. The Arches quarter had the highest production of the five 2014 national park quarters, with more than 465 million minted. American writer
Edward Abbey Edward Paul Abbey (January 29, 1927 – March 14, 1989) was an American author, essayist, and environmental activist noted for his advocacy of environmental issues and criticism of public land policies. His best-known works include ''Desert Solit ...
was a
park ranger A ranger, park ranger, park warden, or forest ranger is a law enforcement person entrusted with protecting and preserving parklands – national, state, provincial, or local parks. Description "Parks" may be broadly defined by some systems in thi ...
at Arches National Monument in 1956 and 1957, where he kept journals that became his book ''
Desert Solitaire ''Desert Solitaire: A Season in the Wilderness'' is an autobiographical work by American writer Edward Abbey, originally published in 1968. His fourth book and his first book-length non-fiction work, it follows three fictional books: '' Jonatha ...
''. The success of Abbey's book, as well as interest in
adventure travel Adventure travel is a type of niche tourism, involving exploration or travel with a certain degree of risk (real or perceived), and which may require special skills and physical exertion. In the United States, adventure tourism has grown in r ...
, has drawn many
hikers Hiking is a long, vigorous walk, usually on trails or footpaths in the countryside. Walking for pleasure developed in Europe during the eighteenth century.AMATO, JOSEPH A. "Mind over Foot: Romantic Walking and Rambling." In ''On Foot: A Histor ...
,
mountain bike A mountain bike (MTB) or mountain bicycle is a bicycle designed for off-road cycling. Mountain bikes share some similarities with other bicycles, but incorporate features designed to enhance durability and performance in rough terrain, which ...
rs, and off-pavement driving enthusiasts to the area. Permitted activities within the park include camping, hiking along designated trails, backpacking, canyoneering, rock climbing, bicycling, and driving along existing roads, both paved and unpaved. The Hayduke Trail, an backpacking route named after one of Edward Abbey's characters, begins in the park.


Plants and animals

An abundance of
wildlife Wildlife refers to domestication, undomesticated animal species (biology), species, but has come to include all organisms that grow or live wilderness, wild in an area without being species, introduced by humans. Wildlife was also synonymous ...
occurs in Arches National Park, including spadefoot toads, antelope squirrels, scrub jays,
peregrine falcons The peregrine falcon (''Falco peregrinus''), also known as the peregrine, and historically as the duck hawk in North America, is a cosmopolitan bird of prey (raptor) in the family Falconidae. A large, crow-sized falcon, it has a blue-grey back, ...
, many kinds of
sparrows Sparrow may refer to: Birds * Old World sparrows, family Passeridae * New World sparrows, family Passerellidae * two species in the Passerine family Estrildidae: ** Java sparrow ** Timor sparrow * Hedge sparrow, also known as the dunnock or hed ...
,
red foxes The red fox (''Vulpes vulpes'') is the largest of the true foxes and one of the most widely distributed members of the order Carnivora, being present across the entire Northern Hemisphere including most of North America, Europe and Asia, p ...
,
desert bighorn sheep The desert bighorn sheep (''Ovis canadensis nelsoni'') is a subspecies of bighorn sheep (''Ovis canadensis'') that is native to the deserts of the United States' intermountain west and southwestern regions, as well as northwestern Mexico. The Bu ...
,
kangaroo rats Kangaroo rats, small mostly nocturnal rodents of genus ''Dipodomys'', are native to arid areas of western North America. The common name derives from their bipedal form. They hop in a manner similar to the much larger kangaroo, but developed thi ...
, mule deers,
cougars The cougar (''Puma concolor'') is a large cat native to the Americas. Its range spans from the Canadian Yukon to the southern Andes in South America and is the most widespread of any large wild terrestrial mammal in the Western Hemisphere. I ...
, midget faded rattlesnakes, yucca mothes, western rattlesnakes, and collared lizards. Plants also dominate the landscape in the park, including
prickly pear cactus ''Opuntia'', commonly called prickly pear or pear cactus, is a genus of flowering plants in the cactus family Cactaceae. Prickly pears are also known as ''tuna'' (fruit), ''sabra'', ''nopal'' (paddle, plural ''nopales'') from the Nahuatl word f ...
,
Indian ricegrass ''Eriocoma hymenoides'' (common names: Indian ricegrass and sand rice grass) is a cool-season, perennial bunchgrass with narrow, rolled leaf blades.Mojave Desert Wildflowers, Pam MacKay, 2nd Ed., p287 It is native to western North America east of ...
,
bunch grass Tussock grasses or bunch grasses are a group of grass species in the family Poaceae. They usually grow as singular plants in clumps, tufts, hummocks, or bunches, rather than forming a sod or lawn, in meadows, grasslands, and prairies. As perennial ...
es,
cheatgrass ''Bromus tectorum'', known as downy brome, drooping brome or cheatgrass, is a winter annual grass native to Europe, southwestern Asia, and northern Africa, but has become invasive in many other areas. It now is present in most of Europe, southe ...
,
lichen A lichen ( , ) is a composite organism that arises from algae or cyanobacteria living among filaments of multiple fungi species in a mutualistic relationship.moss Mosses are small, non-vascular flowerless plants in the taxonomic division Bryophyta (, ) '' sensu stricto''. Bryophyta (''sensu lato'', Schimp. 1879) may also refer to the parent group bryophytes, which comprise liverworts, mosses, and hor ...
,
liverworts The Marchantiophyta () are a division of non-vascular land plants commonly referred to as hepatics or liverworts. Like mosses and hornworts, they have a gametophyte-dominant life cycle, in which cells of the plant carry only a single set of ge ...
,
Utah juniper ''Juniperus osteosperma'' (Utah juniper; syn. ''J. utahensis'') is a shrub or small tree native to the southwestern United States. Description The plant reaches , rarely to 9 m, tall. The shoots are fairly thick compared to most junipers, ...
,
Mormon tea ''Ephedra'' is a genus of gymnosperm shrubs. The various species of ''Ephedra'' are widespread in many arid regions of the world, ranging across southwestern North America, southern Europe, northern Africa, southwest and central Asia, northern ...
,
blackbrush ''Coleogyne ramosissima'' or blackbrush, is a low lying, dark grayish-green, aromatic,Turner, Raymond M. 1982. Great Basin desertscrub. In: Brown, David E., ed. Biotic communities of the American Southwest--United States and Mexico. Desert Plan ...
,
cliffrose ''Purshia'' (bitterbrush or cliff-rose) is a small genus of 5–8 species of flowering plants in the family Rosaceae which are native to western North America. Description ''Purshia'' species form deciduous or evergreen shrubs, typically reach ...
, four-winged saltbrush,
pinyon pine The pinyon or piñon pine group grows in southwestern North America, especially in New Mexico, Arizona, and Utah. The trees yield edible nuts, which are a staple food of Native Americans, and widely eaten as a snack and as an ingredient in New ...
,
evening primrose ''Oenothera'' is a genus of about 145 species of herbaceous flowering plants native to the Americas. It is the type genus of the family Onagraceae. Common names include evening primrose, suncups, and sundrops. They are not closely related to ...
,
sand verbena ''Abronia'', the sand-verbenas or wild lantanas, is a genus of about 20 species of annual or perennial herbaceous plants in the family Nyctaginaceae. Despite the common names, they are not related to ''Verbena'' (vervains) or lantanas in the fa ...
,
yucca ''Yucca'' is a genus of perennial shrubs and trees in the family Asparagaceae, subfamily Agavoideae. Its 40–50 species are notable for their rosettes of evergreen, tough, sword-shaped leaves and large terminal panicles of white or whitish flo ...
, and sacred datura.
Biological soil crust Biological soil crusts are communities of living organisms on the soil surface in arid and semi-arid ecosystems. They are found throughout the world with varying species composition and cover depending on topography, soil characteristics, climate, ...
consisting of
cyanobacteria Cyanobacteria (), also known as Cyanophyta, are a phylum of gram-negative bacteria that obtain energy via photosynthesis. The name ''cyanobacteria'' refers to their color (), which similarly forms the basis of cyanobacteria's common name, blu ...
, lichen, mosses,
green algae The green algae (singular: green alga) are a group consisting of the Prasinodermophyta and its unnamed sister which contains the Chlorophyta and Charophyta/Streptophyta. The land plants (Embryophytes) have emerged deep in the Charophyte alga as ...
, and
microfungi Microfungi or micromycetes are fungi—eukaryotic organisms such as molds, mildews and rusts—which have microscopic spore-producing structures. They exhibit tube tip-growth and have cell walls composed of chitin, a polymer of ''N''-acetylglucosa ...
is found throughout southeastern Utah. The fibrous growths help keep soil particles together, creating a layer that is more resistant to erosion. The living soil layer readily absorbs and stores water, allowing more complex forms of plant life to grow in places with low precipitation levels.


Features

Among the notable features of the park are the following: *
Balanced Rock Balanced Rock is one of the most popular features of Arches National Park, situated in Grand County, Utah, United States. Balanced Rock is located next to the park's main road, at about 9.2 miles (14.8 km) from the park entrance. It is on ...
 – a large balancing rock, the size of three school buses * Courthouse Towers – a collection of tall stone columns * Dark Angel – a free-standing sandstone pillar at the end of the Devils Garden Trail *
Delicate Arch Delicate Arch is a freestanding natural arch located in Arches National Park, near Moab, Utah, Moab in Grand County, Utah, Grand County, Utah, United States. The arch is the most widely recognized landmark in Arches National Park and is depicted ...
 – a lone-standing arch that has become a symbol of Utah and the most recognized arch in the park * Devils Garden – many arches and columns scattered along a ridge *
Double Arch A double is a look-alike or doppelgänger; one person or being that resembles another. Double, The Double or Dubble may also refer to: Film and television * Double (filmmaking), someone who substitutes for the credited actor of a character * ...
 – two arches that share a common end * Fiery Furnace – an area of maze-like narrow passages and tall rock columns (see biblical reference, Book of Daniel, chapter 3) *
Landscape Arch Landscape Arch is the longest of the many natural rock arches located in Arches National Park, Utah, United States and among the longest natural stone arches in the world. Description The arch is among many in the Devils Garden area in the nor ...
 – a very thin and long arch in the Devils Garden with a span of (the longest arch in the park) * Petrified Dunes – petrified remnants of dunes blown from the ancient lakes that covered the area *
Wall Arch Wall Arch was a natural sandstone arch in Arches National Park in southeastern Utah, United States. Before its collapse in 2008, it was ranked 12th in size among the park's over 2,000 arches. At its largest, the opening underneath the span was ...
 – located along the popular Devils Garden Trail; collapsed sometime on August 4/5, 2008


Gallery

File:Double arch.jpg,
Double Arch A double is a look-alike or doppelgänger; one person or being that resembles another. Double, The Double or Dubble may also refer to: Film and television * Double (filmmaking), someone who substitutes for the credited actor of a character * ...
File:The Windows 08 (4106403138).jpg, The Windows File:The Organ at Arches National Park Utah Corrected.jpg, The Organ, a sandstone tower in the Courthouse Towers area File:The Three Gossips at Arches National Park.jpg, The Three Gossips File:Arches Nationalpark Broken Arch P4180541.jpg, Broken Arch File:Double-O-Arch Arches National Park 2.jpg, Double O Arch File:Arches Nationalpark Navajo Arch P4180554.jpg, Navajo Arch File:Skyline Arch at Arches National Park-Unburnsky.jpg, Skyline Arch File:Arches Nationalpark Partition Arch P4190558.jpg, Partition Arch File:16 21 1705 arches.jpg, Pine Tree Arch File:16 21 1719 arches.jpg, Tunnel Arch File:Arches Nationalpark Sand Dune Arch P4180540.jpg, Sand Dune Arch File:Dark Angel in Arches National Park.jpg, Dark Angel


See also

* List of national parks of the United States *
National Register of Historic Places listings in Arches National Park This is a list of the National Register of Historic Places listings in Arches National Park. This is intended to be a complete list of the properties and districts on the National Register of Historic Places in Arches National Park, Utah, United ...
*
Natural Bridges National Monument Natural Bridges National Monument is a U.S. National Monument located about northwest of the Four Corners boundary of southeast Utah, in the western United States, at the junction of White Canyon and Armstrong Canyon, part of the Colorado ...
- three natural bridges formed by flowing water *
Rainbow Bridge National Monument Rainbow Bridge National Monument is administered by Glen Canyon National Recreation Area, southern Utah, United States. Rainbow Bridge is often described as the world's highest natural bridge. The span of Rainbow Bridge was reported in 1974 by ...
- the largest natural bridge in the Western Hemisphere


References


Further reading

*


External links

*
Utah Office of Tourism page on Arches National Park
*
Historic American Engineering Record Heritage Documentation Programs (HDP) is a division of the U.S. National Park Service (NPS) responsible for administering the Historic American Buildings Survey (HABS), Historic American Engineering Record (HAER), and Historic American Landscapes ...
(HAER) documentation, filed under Moab, Grand County, UT: ** ** {{authority control 1929 establishments in Utah Colorado Plateau National parks in Utah Natural arches of Utah Protected areas established in 1971 Protected areas of Grand County, Utah Protected areas on the Colorado River Natural arches of Grand County, Utah Geotopes Climbing areas of Utah