West Wetlands Park (Yuma, AZ)
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The West Wetlands Park is a public city park at the northwest edge of
Yuma, Arizona Yuma ( coc, Yuum) is a city in and the county seat of Yuma County, Arizona, United States. The city's population was 93,064 at the 2010 census, up from the 2000 census population of 77,515. Yuma is the principal city of the Yuma, Arizona, M ...
, it is located along 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 watershed that encompasses parts of seven U.S. s ...
within the
Yuma Crossing National Heritage Area Yuma Crossing is a site in Arizona and California that is significant for its association with transportation and communication across the Colorado River. It connected New Spain and Las Californias in the Spanish Colonial period in and also durin ...
. The park opened in December of 2002 on 110 acres of city-owned land. It was partially constructed by community volunteers and has been regularly voted Yuma's best park. The West Wetlands Park is currently managed by a non-profit organization, the
Yuma Crossing National Heritage Area Yuma Crossing is a site in Arizona and California that is significant for its association with transportation and communication across the Colorado River. It connected New Spain and Las Californias in the Spanish Colonial period in and also durin ...
Corporation and is maintained by the City of Yuma Parks and Recreation Department.


History


1910–1989

From 1910 to 1970 the area that would become West Wetlands Park was used as the City of Yuma landfill. After the landfill was closed, the deserted area attracted vagrants and criminals. Periodically, fires burned native vegetation along the river allowing invasive species to overtake the habitat. The area became a hazard to local residents, who were cut off from the resources of the river. Beginning in the 1980's, there was an interest by Yuma citizens to convert the previous landfill into a riverfront park. Arizona State Parks worked with the City of Yuma to develop a master plan which was stalled due to lack of funding.http://www.ci.yuma.az.us/Documents/COY_HeritageAreaExecutiveSummary.pdf


1990–1999

In early 1990, the
United States Environmental Protection Agency The Environmental Protection Agency (EPA) is an independent executive agency of the United States federal government tasked with environmental protection matters. President Richard Nixon proposed the establishment of EPA on July 9, 1970; it ...
(EPA) determined that covering the whole site with 6 to 8 feet of clean fill was required for reuse. The Yuma Crossing National Heritage Area understood that $10 million would be needed as they were tasked to design a master plan which would include securing the funds for the clean up and construction. An implementation team was required to obtain grants and manage the construction of the project. The first success in obtaining funding was a $23,000 grant from the
Arizona Game and Fish Department The Arizona Game and Fish Department is a state agency of Arizona, headquartered in Phoenix. The agency is tasked with conserving, enhancing, and restoring Arizona's diverse wildlife resources and habitats through protection and management progr ...
. Another endowment was secured by Congressman
Ed Pastor Edward Lopez Pastor (; June 28, 1943 – November 27, 2018) was an American politician who served as a member of the United States House of Representatives from Arizona from 1991 to 2015. A member of the Democratic Party, he represented Arizona ...
from the
Bureau of Reclamation The Bureau of Reclamation, and formerly the United States Reclamation Service, is a federal agency under the U.S. Department of the Interior, which oversees water resource management, specifically as it applies to the oversight and opera ...
. The $1.45 million would be used to improve areas adjacent to reclamation land, as well as the building of a boat ramp. Over a three-year period, the Heritage Area was able to garner many other grants, which were used to advance the planning of the park. Three grants were received from the State of Arizona Heritage Fund: A $95,000 trails grant, a $372,500 SLIF grant; and a $547,500 LRSP grant. Another grant of $1 million was provided by the City of Yuma to help with building roads and utility infrastructure within the park, and directed all Public Works projects to transport clean fill to the site. In September 1999 the master plan was complete when the Heritage Area sponsored a community planning effort to finalize the design of West Wetlands. A part of "Phase 1" occurred a month later when the Yuma Crossing hosted a volunteer day, where 700 volunteers planted 450 trees at the Millennium Tree Grove.


2000–2006

In 2001, an additional $500,000 was secured by Congressman Ed Pastor through the Bureau of Reclamation, for the pilot re-vegetation project. The first phase of the park development opened in December 2002. The pond was dug out in the first phase of the project and was completed, filled, and opened in late 2003 with the additional Reclamation grant funds. The pond has a bowl design and is approximately 15 feet deep. In 2005, Arizona Public Service (APS) partnered with the City of Yuma to develop a solar garden as a solar demonstration area. The solar garden consists of twenty-four photo-voltaic energy panels that produce 3,600 watts of power that is directed to the City of Yuma electrical grid and provides power for the lighting within the park. Approximately twenty homes can be powered with this energy. The output of a single tracker is displayed in the armada in front of the solar garden. They rotate 80 degrees from the East in the morning to the West in the afternoon. After dark they utilize a very small amount from the grid to move the panels to face the East. The solar garden is owned and maintained by APS. The Army of the West statue, also known as 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 severa ...
statue, was created by R.C. Merrill. The statue was erected and funded entirely with private funds along with a commitment for ongoing maintenance in 2006. Many Mormons of the Yuma community collaborated in the making of the nine foot bronze statue. 2nd Lt. Philemon Merrill and others participated in the 1900-mile march from
Council Bluffs Council Bluffs is a city in and the county seat of Pottawattamie County, Iowa, United States. The city is the most populous in Southwest Iowa, and is the third largest and a primary city of the Omaha-Council Bluffs Metropolitan Area. It is loc ...
,
Iowa Iowa () is a state in the Midwestern region of the United States, bordered by the Mississippi River to the east and the Missouri River and Big Sioux River to the west. It is bordered by six states: Wisconsin to the northeast, Illinois to th ...
to
San Diego San Diego ( , ; ) is a city on the Pacific Ocean coast of Southern California located immediately adjacent to the Mexico–United States border. With a 2020 population of 1,386,932, it is the eighth most populous city in the United State ...
,
California California is a state in the Western United States, located along the Pacific Coast. With nearly 39.2million residents across a total area of approximately , it is the most populous U.S. state and the 3rd largest by area. It is also the m ...
, which included crossing the Colorado River on January 9 and 10 of 1846. The statue was erected to honor the crossing and the contributions of those military organizations that led to the expansion of the west.


2007–present

In 2007, the Stewart Vincent Wolfe Creative Playground was created by the combined effort of Yuman volunteers in honor of Stewart Vincent Wolfe's memory. Wolfe and his family were regular visitors at the park. Ron Martin, a close friend of Wolfe, donated $100,000.00 towards construction of the playground in honor of Wolfe. The development of playground started with a total of 8,000 Yuma volunteers, who raised a total of $45,264.00 to contribute to the construction of the playground. The creative inspiration for the artistic design of the playground was inspired by elementary school students. For the rest of 2007, the initial plan for West Wetlands from 1999, was updated by the Heritage Area and the City of Yuma. In 2009, using
economic stimulus In economics, stimulus refers to attempts to use monetary policy or fiscal policy (or stabilization policy in general) to stimulate the economy. Stimulus can also refer to monetary policies such as lowering interest rates and quantitative easi ...
funds provided by the federal government, the paved walking trail was extended from the playground area all the way to the southwest entrance to the park. The trail parallels the main road through the park and is equipped with lighting, increasing accessibility to the western portions of the park into the evening and providing bikers and joggers with a paved surface from one end of the park to the other. In 2014, a new
beach A beach is a landform alongside a body of water which consists of loose particles. The particles composing a beach are typically made from rock, such as sand, gravel, shingle, pebbles, etc., or biological sources, such as mollusc sh ...
was opened in the park, to mark the 100th anniversary of Yuma. Situated along the Colorado River, it is aptly called Centennial Beach. On December 28, 2014 the Stewart Vincent Wolfe Creative Playground was destroyed by a fire, which appeared intentional according to the local police department. The park's reconstruction started in September 2015, and re-opened 3 months later, on December 19. Due to a high level of community support, the playground was further expanded during the reconstruction process. In August of 2018, a teen suspect was arrested and charged with arson after admitting to starting the fire, almost 4 years after the incident.


Activities and special events

The City of Yuma Parks and Recreation operates several multi-use trails within the park. On the open grassy areas, one can see kite flyers, yoga enthusiasts, as well as soccer, football, baseball, softball, and disc golf being played. People gather for picnics, parties, barbecues, field trips, geocaching, club meetings, dating, weddings, memorial services, family reunions, and quinceañeras. People also use the park for photography, bird watching, sightseeing, dog walking, painting, studying, reading, and just relaxing. Other activities in the park include fishing in the pond and/or the Colorado River for a variety of fish such as catfish, bluegill, carp, rainbow trout, red-ear sunfish, mullet, and largemouth bass. Other activities that take place in or on the river include tubing, canoeing, kayaking, motor boating, jet skiing, and swimming. The park has a boat launch ramp to facilitate putting craft into the water. On the pond, enthusiasts sail model sailboats. For children, West Wetlands has two playgrounds, the biggest and most visited being the Stewart Vincent Wolfe Creative Playground. The playground area in the Stewart Vincent Wolfe playground, consists of a tire swing, 4 regular swings, 1 adaptive swing for children with disabilities, a climbing wall, 6 slides, a train, a jet, monkey bars, multiple entrances, and more. The playground is surrounded by Pebble Flex ground which is soft for children that may trip or fall. It also makes it easier for wheelchair navigation. There is an area within the playground designed for younger children. It includes one entrance, 3 baby/bucket swings, and smaller swings. It is convenient for those families that have children of multiple ages. There are benches around multiple spots in the playground. There is also a play area that has faux rocks and a metal tractor scoop toy, both which children can climb on. Special events at the park include: * Walkathons/marathons Various 10k and 5k runs, Color Runs, the March of Dimes, the Diabetes Walk, Toro Loco and others. * Colorado River Balloon Festival * Two Rivers Renaissance Faire * Movies in the park * Blue Grass in the Park * Jazz on the Green * Catfish Rodeo * Annual Float-down Regatta


Plants


Invasive plants

The Yuma West Wetlands park was inhabited by several types of invasive plant species such as the salt cedar tree (''
Tamarix ramosissima ''Tamarix ramosissima'', commonly known as saltcedar salt cedar, or tamarisk, is a deciduous arching shrub with reddish stems, feathery, pale green foliage, and characteristic small pink flowers. The cultivar 'Pink Cascade' (dark pink flowered) ...
''), giant reed (''
Arundo donax ''Arundo donax'' is a tall perennial cane. It is one of several so-called reed species. It has several common names including giant cane, elephant grass, carrizo, arundo, Spanish cane, Colorado river reed, wild cane, and giant reed. ''Arundo'' a ...
''), Russian olive (''
Elaeagnus angustifolia ''Elaeagnus angustifolia'', commonly called Russian olive, silver berry, oleaster, or wild olive, is a species of ''Elaeagnus'', native to western and central Asia, Iran, from southern Russia and Kazakhstan to Turkey, parts of Pakistan and parts of ...
''), buffelgrass ('' Cenchrus ciliaris''), and common mullein (''
Verbascum thapsus ''Verbascum thapsus'', the great mullein, greater mullein or common mullein is a species of mullein native to Europe, northern Africa, and Asia, and introduced in the Americas and Australia. It is a hairy biennial plant that can grow to 2 m tal ...
''). The salt cedar (''Tamarix ramosissima'') tree is particularly dangerous to the ecology of the West Wetlands Park due to the salt that is secreted through its leaves which increases the salinity of the surface soil. Increased salinity of the soil is lethal for all native vegetation and animal species. It grows very successfully along
riparian zones A riparian zone or riparian area is the interface between land and a river or stream. Riparian is also the proper nomenclature for one of the terrestrial biomes of the Earth. Plant habitats and communities along the river margins and banks ar ...
and tends to completely replace all native vegetation in these areas. Salt cedar communities support fewer native bird populations. It absorbs water at an exponential rate, across the entirety of the Colorado River System, it is responsible for a daily absorption of 200 gallons of water. Giant reed (''
Arundo donax ''Arundo donax'' is a tall perennial cane. It is one of several so-called reed species. It has several common names including giant cane, elephant grass, carrizo, arundo, Spanish cane, Colorado river reed, wild cane, and giant reed. ''Arundo'' a ...
''), also known as wild cane is an invasive species that has greatly compromised the lower Colorado River riparian zone. The
United States Department of Agriculture The United States Department of Agriculture (USDA) is the federal executive department responsible for developing and executing federal laws related to farming, forestry, rural economic development, and food. It aims to meet the needs of com ...
describes it as a
perennial A perennial plant or simply perennial is a plant that lives more than two years. The term ('' per-'' + '' -ennial'', "through the years") is often used to differentiate a plant from shorter-lived annuals and biennials. The term is also wid ...
grass that grows from nine to thirty feet in height. Successful establishment of giant reed within a riparian area results in a decline of the native plant species. It does not provide shelter or food for the native wildlife species, so large areas invaded by giant reed have little or no wildlife living amongst it. It dominates the river bank and does not provide the necessary shading for river edge habitats, resulting in warmer water and a lower diversity of aquatic animals. The giant reed along with the salt cedar, have greatly devastated and degraded the lower Colorado River riparian. Russian olive, buffelgrass, and common mullein are not as destructive as salt cedar tree, but these invasive plants aggressively expand and reproduce at rapid rates to destroy or push out native species.


Native plants

The native plant species located at the West Wetlands Park are the cattail (''
Typha latifolia ''Typha latifolia'' (broadleaf cattail, bulrush, common bulrush, common cattail, cat-o'-nine-tails, great reedmace, cooper's reed, cumbungi) is a perennial herbaceous plant in the genus '' Typha''. It is found as a native plant species in North a ...
''), arrowweed ('' Pluchea sericea''), coyote willow (''
Salix exigua ''Salix exigua'' (sandbar willow, narrowleaf willow, or coyote willow; syn. ''S. argophylla, S. hindsiana, S. interior, S. linearifolia, S. luteosericea, S. malacophylla, S. nevadensis,'' and '' S. parishiana'') is a species of willow native to m ...
''), four-wing saltbush ('' Atriplex canescens''), quail bush ('' Atriplex lentiformis''), and seep-willow (''
Baccharis salicifolia ''Baccharis salicifolia'' is a blooming shrub native to the sage scrub community and desert southwest of the United States and northern Mexico, as well as parts of South America. Its usual common name is mule fat;Mojave Desert Wildflowers, Pam M ...
''). Trees include cottonwood (''
Populus fremontii ''Populus fremontii'', commonly known as Frémont's cottonwood, is a cottonwood (and thus a poplar) native to riparian zones of the Southwestern United States and northern through central Mexico. It is one of three species in ''Populus'' sect ...
'') Goodding's willow (''
Salix gooddingii ''Salix gooddingii'' is a species of willow known by the common name Goodding's willow, or Goodding's black willow. It was named for its collector, Leslie Newton Goodding. ''Salix gooddingii'' is native to the southwestern United States and no ...
''), honey mesquite (''
Prosopis juliflora ''Prosopis juliflora'' ( es, bayahonda blanca, Cuji Venezuela, Trupillo Colombia, Aippia Wayuunaiki and long-thorn kiawe in Hawaii) is a shrub or small tree in the family Fabaceae, a kind of mesquite. It is native to Mexico, South America and th ...
'' var. ''torreyana'' = v. ''
Prosopis glandulosa ''Prosopis glandulosa'', commonly known as honey mesquite, is a species of small to medium-sized, thorny shrub or tree in the legume family (Fabaceae). Distribution The plant is primarily native to the Southwestern United States and Northern M ...
''), and screwbean mesquite (''
Prosopis pubescens ''Prosopis pubescens'', commonly known as screwbean mesquite, is a species of flowering shrub or small tree in the pea family, Fabaceae, that is native to the southwestern United States (Texas, Arizona, New Mexico, California, southern Nevad ...
'').


Animals


Mammals

The park hosts several native mammals, including: beaver,
cottontail rabbit Cottontail rabbits are the leporid species in the genus ''Sylvilagus'', found in the Americas. Most ''Sylvilagus'' species have stub tails with white undersides that show when they retreat, giving them their characteristic name. However, this ...
, round-tailed ground squirrel and Botta's pocket gopher.


Birds

Burrowing owl In 2006, the City of Yuma received funds for the "Yuma West Wetlands
Burrowing Owl The burrowing owl (''Athene cunicularia''), also called the shoco, is a small, long-legged owl found throughout open landscapes of North and South America. Burrowing owls can be found in grasslands, rangelands, agricultural areas, deserts, or an ...
Habitat" project. The project constructed a viewing platform to allow for public observation and established 20 artificial burrows for relocation of displaced owls. There is a sign at either end of the habitat directing visitors to the location of the viewing platform. The habitat is a series of PVC pipes protruding from the ground nestled amongst large sage bushes. The western burrowing owl ('' Athene cunicularia'') is the only known owl that spends the majority of its life underground including raising their young. As opposed to most owls which are mainly nocturnal, burrowing owls are active during the day as well. Due to the significant time spent underground, construction projects have been detrimental to the owls and their habitats to the extent of being "
Endangered An endangered species is a species that is very likely to become extinct in the near future, either worldwide or in a particular political jurisdiction. Endangered species may be at risk due to factors such as habitat loss, poaching and in ...
in
Canada Canada is a country in North America. Its ten provinces and three territories extend from the Atlantic Ocean to the Pacific Ocean and northward into the Arctic Ocean, covering over , making it the world's second-largest country by tot ...
,
Threatened Threatened species are any species (including animals, plants and fungi) which are vulnerable to endangerment in the near future. Species that are threatened are sometimes characterised by the population dynamics measure of ''critical depensa ...
in
Mexico Mexico (Spanish: México), officially the United Mexican States, is a country in the southern portion of North America. It is bordered to the north by the United States; to the south and west by the Pacific Ocean; to the southeast by Guatema ...
, and a Species of Special Concern in
Florida Florida is a state located in the Southeastern region of the United States. Florida is bordered to the west by the Gulf of Mexico, to the northwest by Alabama, to the north by Georgia, to the east by the Bahamas and Atlantic Ocean, and to ...
and much of the Western US". "Burrowing owls are not able to dig their own burrows, but create homes in existing underground spaces. Deserted squirrel burrows, kangaroo rat mounds, coyote, fox, skunk and badger dens provide homes for the owls". "They are covered in brown spotted feathers and have long legs. They also sport distinctive white "eyebrows" above bright yellow eyes". Hummingbirds The West Wetlands Park also contains a hummingbird garden that was named after former Yuma district Congressman, Ed Pastor, in appreciation of his great efforts in supporting the restoration and funding of the riverfront parks projects. There are two signs giving different information about the hummingbird garden. The first sign has four maps of North and South America showing the different migration patterns of the four common hummingbirds found in the garden. The next sign describes the specific plants as well as the perennial flowers planted year round that have specific colour spectrum that attract the four hummingbirds opposed to other pollinating insects. It also describes that these hummingbirds prefer dense foliage, trees, shrubs, and vines which allow for easy perching. Arizona is home to 18 hummingbird species, and the West Wetlands Park is home to four of them in the hummingbird garden, including: Anna's hummingbird (''
Calypte anna Anna's hummingbird (''Calypte anna'') is a medium-sized bird species of the family Trochilidae. It was named after Anna Masséna, Duchess of Rivoli. It is native to western coastal regions of North America. In the early 20th century, Anna's hu ...
''), the black-chinned hummingbird ('' Archilochus alexandri''), Costa's hummingbird ('' Calypte costae'') and the rufous hummingbird ('' Selasphorus rufus'').


Other birds

With the continued work done to restore the wetlands to a native environment, the bird population has doubled and its diversity is up by 75%. Among the endangered and threatened species that have been sighted are: Yuma clapper rail (''Rallus longirostris''), southwestern willow flycatcher (''
Empidonax traillii The willow flycatcher (''Empidonax traillii'') is a small insect-eating, neotropical migrant bird of the tyrant flycatcher family. There are four subspecies of the willow flycatcher currently recognized, all of which breed in North America (inc ...
'') and western yellow-billed cuckoo ('' Coccyzus americanus''). The
flagship species In conservation biology, a flagship species is a species chosen to raise support for biodiversity conservation in a given place or social context. Definitions have varied, but they have tended to focus on the strategic goals and the socio-economi ...
, the white-faced ibis, has been seen returning, nesting and feeding in the West Wetlands. Some of the other sightings include the great and snowy egrets, and the long-billed Savannah sparrows. These are a few of the species that have returned to nest, feed and stop off on their migratory journey. Other birds seen during the winter are: hooded and common mergansers (if there is enough water), green heron, sharp-shinned and Cooper's hawks, belted kingfisher, black and Say's phoebes. Some expected and seasonal residents include the warblers, all the western warblers can be seen during the summer: The Wilson's warbler, the yellow warbler, the yellow-rumped warbler, the orange-crowned warbler, the hermit warbler, the black-throated gray warblers, and the yellow-breasted chat. The western kingbird, western wood pewee, olive-sided flycatcher, gray flycatcher, ash-throated flycatcher, may also be seen in the summer. Year-round residents are: The greater roadrunner, the Gambel's quail, the ladder-backed woodpecker, the Gila woodpecker, the crissal thrasher, the great-tailed grackle, the verdin, the black-tailed gnat-catcher, the common yellow-throat sparrow, and the song sparrow. Winter visitors include: The osprey, the blue-gray gnat-catcher, and the Lincoln's sparrow. Rare and unusual birds that have been seen in the area include: The northern parula (fall 2012), the red-naped and red-breasted hybrid sapsucker (fall 2012), the eastern phoebe (fall 2012), and the summer tanager (November 2012).


Reptiles

On the east side of the Yuma West Wetlands, large western diamondbacked rattlesnake have been spotted.


Insects

Butterflies The butterfly habitat is west of the hummingbird garden. This habitat is filled with mostly yellow and orange flowering bushes and trees scattered throughout. The following butterflies are common: The giant swallowtail (''
Papilio cresphontes The giant swallowtail (''Papilio cresphontes'') is the largest butterfly in North America. It is abundant through many parts of eastern North America; populations from western North America and down into Panama are now (as of 2014) considered t ...
''), the monarch butterfly (''
Danaus plexippus The monarch butterfly or simply monarch (''Danaus plexippus'') is a milkweed butterfly (subfamily Danainae) in the family Nymphalidae. Other common names, depending on region, include milkweed, common tiger, wanderer, and black-veined brown. I ...
''), the queen butterfly (''
Danaus gilippus The queen butterfly (''Danaus gilippus'') is a North and South American butterfly in the family Nymphalidae with a wingspan of . It is orange or brown with black wing borders and small white forewing spots on its dorsal wing surface, and reddish ...
''), the western pygmy blue butterfly ('' Brephidium exilis'') or ('' Brephidium exile''), the orange sulphur butterfly (''
Colias ''Colias'' is a genus of butterflies in the family Pieridae. They are often called clouded yellows; the North American name "sulphurs" is elsewhere used for Coliadinae in general. The closest living relative is the genus '' Zerene'', which is so ...
''), the painted lady butterfly (''
Vanessa cardui ''Vanessa cardui'' is the most widespread of all butterfly species. It is commonly called the painted lady, or formerly in North America the cosmopolitan. Description File:Vanessa cardui MHNT CUT 2013 3 14 Pontfaverger-Moronvilliers Dos. ...
''), the fiery skipper butterfly ('' Hylephila phyleus''), the funereal duskywing butterfly (''
Erynnis funeralis ''Erynnis funeralis'', the funereal duskywing, is a butterfly of the family Hesperiidae. It is found from southern California, Arizona, New Mexico and Texas, south to Argentina and Chile. Strays can be found north up to northern Illinois, north ...
''), and the snout butterfly (''
Libytheinae The Libytheinae are a nymphalid subfamily known as snout butterflies, containing two valid genera and about ten species: six in '' Libythea'' and four in ''Libytheana''. The common name refers to the thick labial palps (pedipalps) that look like ...
'').


Habitats

The natural and man-made habitats that can be found at West Wetlands park are the Hummingbird Garden, Burrowing Owls, Butterfly Garden, Willow Fly Catcher Nesting Habitat, Millennium Grove, Beaver Pond, Lower Bench, and
Cactus garden A cactarium or cactuario (from Latin, ''cactarium'') is a garden dedicated to the planting of cacti. While they generally specialize in collecting cacti, they can also include other desert plants such as sabla, agaves or Crassulaceae, although thi ...
.


Habitat restoration

Out of the 110 acres of the West Wetlands Park, approximately 30 percent is restored riparian habitat, known as the "Lower Bench". Prior to restoring the lower bench the area was deteriorated and overrun with trash and opportunist vegetation, in particular salt cedar and giant reeds. Large expanses of non-native species were bulldozed from the area, as others were manually hoed out. Brush hogs, masticators, and chemical herbicides are used to keep the invasive species under control. Consistent maintenance is needed to eradicate the constantly growing giant reed.


Geology and hydrology

The Yuma Area Office of 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 Ea ...
and
Groundwater Groundwater is the water present beneath Earth's surface in rock and soil pore spaces and in the fractures of rock formations. About 30 percent of all readily available freshwater in the world is groundwater. A unit of rock or an unconsolidated ...
Team of the Bureau of Reclamation, Yuma Area Office, in partnership with the
US Geological Survey The United States Geological Survey (USGS), formerly simply known as the 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, and ...
, completed geological investigations of the West Wetlands Park in 1970 and 1971. This investigation resulted from the Arizona v. California water dispute. Geologic boring, via the "Piezometer Yuma Area Logs" show that the underneath area of the West Wetlands Park was approximately 12 to 17 feet of "garbage" from the previous landfill site. Below the garbage there is about 80 feet of river deposited silt, sand and clay, which is consistent with the sediments found commonly in areas that are near
deltaic A river delta is a landform shaped like a triangle, created by deposition of sediment that is carried by a river and enters slower-moving or stagnant water. This occurs where a river enters an ocean, sea, estuary, lake, reservoir, or (more rarel ...
and riparian environments. At about 100 feet depth, the top of the coarse-gravel zone is encountered, which is the most important water-producing
aquifer An aquifer is an underground layer of water-bearing, permeable rock, rock fractures, or unconsolidated materials ( gravel, sand, or silt). Groundwater from aquifers can be extracted using a water well. Aquifers vary greatly in their characteris ...
in the Yuma area.


References


External links


City of Yuma Parks and Recreation Department


{{Authority control Lower Colorado River Valley Parks in Yuma County, Arizona Yuma, Arizona Cactus gardens