Barton Springs is a set of four natural water springs located at Barton Creek on the grounds of Zilker Park[2] in Austin, Texas, resulting from water flowing through the Edwards Aquifer. The largest spring, Main Barton Spring (also known as Parthenia, "the mother spring"), supplies water to Barton Springs Pool, a popular recreational destination in Austin. The smaller springs are located nearby, two with man-made structures built to contain and direct their flow. The springs are the only known habitat of the Barton Springs Salamander, an endangered species.[3]
The Barton Creek National Archeological and Historic District was formed in 1985.
Geology
Barton Springs is the main discharge point for the Barton Springs segment of the Edwards Aquifer of Texas, a well known karst aquifer. Geologically, the aquifer is composed of limestone from the Cretaceous period, about 100 million years old. Fractures, fissures, conduits, and caves have developed in this limestone. Both physical forces, such as faulting, and chemical forces, such as dissolution of limestone by infiltrating water, have enlarged these voids. This results in a karst aquifer made up of limestone with large void spaces. Water then enters the aquifer and fills the voids.[4]
All water discharging from Barton Springs originates as rainfall. Some of this rain falls directly onto the area of land where the aquifer limestone rock is exposed, which is known as the recharge zone. Other rainfall enters into creeks that cross the recharge zone, and infiltrates the limestone bedrock. After water enters the aquifer, it flows along the gradients created by differences in hydraulic pressure into the area of lowest hydraulic pressure. This lowest point of hydraulic pressure is Barton Springs.
Main spring
Main Barton Spring/Parthenia is the most famous, yet least visible of the four springs because it is completely submerged by pool water. Located near the diving board in Barton Springs Pool, the spring's flow is not always visible at the surface.
The main spring discharges an average flow of about 31million US gallons (120,000m3) per day. The lowest discharge ever recorded was 9million US gallons (34,000m3) per day during the drought of the 1950s, and the highest discharge ever recorded was 85million US gallons (320,000m3) per day during December 1991[5] and September 2016[6] flooding. By comparison, a typical domestic in-ground swimming pool holds about 20,000 US gallons (76m3), and the City of Austin, a city of about 1 million residents, uses about 120million US gallons (450,000m3) per day for its public water supply system.[7]
Other springs
Eliza Spring in 2005.
The three other springs associated with Barton Springs are Eliza, Old Mill, and Upper Barton Spring. Each is significantly smaller than Main Barton Spring, discharging an average of 3million US gallons (11,000m3) per day. Sometimes, these springs dry up completely.
Eliza Spring, also known as Concession Spring, is located near the north entrance to Barton Springs Pool, 300 feet (100m) east towards the children's playscape. During the early 20th century, an amphitheater-style swimming enclosure was built around the spring. This structure is no longer open to the public due to safety concerns, and the fact that Eliza Spring has become a sensitive habitat area for the endangered Barton Springs Salamander.
Old Mill Spring, also known as Sunken Gardens Spring or Zenobia Spring, is located on the south side of Barton Springs Pool. Like Eliza Spring, the early 20th century structure built around the spring is now closed to public access due to safety and endangered species habitat issues. Scientific analysis show that the water at Old Mill Spring has a slightly different chemistry than that of Main Barton Spring and Eliza Spring, even though it is less than half a mile (800 m) away from these springs.
Upper Barton Spring is located in the creek bed of Barton Creek, about a half mile (800 m) upstream or west of Barton Springs Pool. Frequently dry, Upper Barton Spring is fully submerged by Barton Creek during floods. The water at Upper Barton Spring also has a significantly different chemistry than the other springs.
The entire area around Barton Springs is riddled with faults from the Balcones Fault Zone and features other, smaller springs. For example, about one mile (2km) upstream of Upper Barton Spring, an intermittent spring fills a popular natural swimming hole. Several other small springs empty directly into the Barton Creek bypass tunnel that passes to the side of Barton Springs Pool.[8]
An aquifer is an underground layer of water-bearing material, consisting of permeable or fractured rock, or of unconsolidated materials. Aquifers vary greatly in their characteristics. The study of water flow in aquifers and the characterization of aquifers is called hydrogeology. Related terms include aquitard, which is a bed of low permeability along an aquifer, and aquiclude, which is a solid, impermeable area underlying or overlying an aquifer, the pressure of which could lead to the formation of a confined aquifer. The classification of aquifers is as follows: Saturated versus unsaturated; aquifers versus aquitards; confined versus unconfined; isotropic versus anisotropic; porous, karst, or fractured; transboundary aquifer.
The Barton Springs salamander is an endangered lungless salamander. It is endemic to Texas, United States. It was first found in Barton Springs in Austin, but is now also known from other localities in the nearby Travis and Hays Counties. Barton Springs is located within Zilker Park which is situated in the Edwards Aquifer in Austin, Texas. Eliza Springs, located within Barton Springs, has one of the largest populations of Barton Springs salamanders.
The Edwards Plateau is a geographic region forming the crossroads of Central, South and West Texas, United States. It is named in honor of Haden Edwards. It is bounded by the Balcones Fault to the south and east; the Llano Uplift and the Llano Estacado to the north; and the Pecos River and Chihuahuan Desert to the west. San Angelo, Austin, San Antonio and Del Rio roughly outline the area. The plateau, especially its southeast portion, is also known as the Texas Hill Country.
Barton Springs Pool is a recreational outdoor swimming pool in Austin, Texas, that is filled entirely by natural springs connected to the Edwards Aquifer. Located in Zilker Park, the pool exists within the channel of Barton Creek and uses water from Main Barton Spring, the fourth-largest spring in Texas. The pool is a popular venue for year-round swimming, as its temperature hovers between about 68 °F (20 °C) and 74 °F (23 °C) year-round. The pool's grassy hills are lined with mature shade trees.
Mount Bonnell, also known as Covert Park, is a prominent point alongside the Lake Austin portion of the Colorado River in Austin, Texas. It has been a popular tourist destination since the 1850s. The mount provides a vista for viewing the city of Austin, Lake Austin, and the surrounding hills. It was designated a Recorded Texas Historic Landmark in 1969, bearing Marker number 6473, and was listed on the National Register of Historic Places in 2015.
Barton Creek is a tributary that feeds the Colorado River as it flows through the Texas Hill Country. The creek passes through some of the more scenic areas in Greater Austin, surrounded in many parts by a greenbelt of protected lands that serves as a habitat for many indigenous species of flora and fauna. The creek passes through Barton Creek Greenbelt and is fed by Barton Springs.
The Meadows Center for Water and the Environment, formerly Aquarena Springs and later the Aquarena Center, is an educational center in San Marcos, Texas. It seeks to preserve the unique archeological and biological resources of Spring Lake.
The Floridan aquifer system, composed of the Upper and Lower Floridan aquifers, is a sequence of Paleogene carbonate rock which spans an area of about 100,000 square miles (260,000 km2) in the southeastern United States. It underlies the entire state of Florida and parts of Alabama, Georgia, Mississippi, and South Carolina.
The Edwards Aquifer is one of the most prolific artesian aquifers in the world. Located on the eastern edge of the Edwards Plateau in the U.S. state of Texas, it is the source of drinking water for two million people, and is the primary water supply for agriculture and industry in the aquifer's region. Additionally, the Edwards Aquifer feeds the Comal and San Marcos Springs, provides springflow for recreational and downstream uses in the Nueces, San Antonio, Guadalupe, and San Marcos river basins, and is home to several unique and endangered species.
Save Our Springs Alliance (SOS), originally called the Save Our Springs Legal Defense Fund, was a nonprofit corporation created to protect the citizen-drafted SOS Ordinance of 1992 to conserve Barton Springs in Austin, Texas. The ordinance was written by citizens in reaction to the city's "Composite Ordinance," which citizens regarded as insufficient to save Barton Springs.
San Marcos Springs is the second largest natural cluster of springs in Texas. The springs are located in the city of San Marcos, Texas, about 30 miles (48 km) southwest of Austin and 46 miles (74 km) northeast of San Antonio.
Salado Springs is the name of five groups of springs at the town of Salado in Bell County, Texas, in the United States. The springs are located 48 miles (77 km) north of Austin or 135 miles (217 km) south of Dallas.
Dallas Water Utilities (DWU) is the water and wastewater service operated by the City of Dallas, Texas, in the United States. DWU is a non-profit City of Dallas department that provides services to the city and 31 nearby communities, employs approximately 1450 people, and consists of 26 programs. DWU's budget is completely funded through the rates charged for water and wastewater services provided to customers. Rates are based on the cost of providing the services. The department does not receive any tax revenues. Primary authority and rules for the department are listed in Chapter 49Archived 2006-10-04 at the Wayback Machine of the Dallas City Code.
Giant Springs is a large first magnitude spring located near Great Falls, Montana and is the central feature of Giant Springs State Park. Its water has a constant temperature of 54 °F (12 °C) and originates from snowmelt in the Little Belt Mountains, 60 miles (97 km) away. According to chlorofluorocarbon dating, the water takes about 3,000 years to travel underground before returning to the surface at the springs.
Barton Hills is a neighborhood in Austin, Texas. It is located in south Austin, and encompasses part of ZIP code 78704.
Balcones Canyonlands is a national wildlife refuge located in the Texas Hill Country to the northwest of Lago Vista, Texas. The refuge was formed in 1992 to conserve habitat for two endangered songbirds, the golden-cheeked warbler and the black-capped vireo, and to preserve Texas Hill Country habitat for numerous other wildlife species. The refuge augments a similarly named preserve in Austin called the Balcones Canyonlands Preserve.
Kissingen Spring was a natural spring formerly flowing in Polk County, Southwest Florida. It was also a venue for recreation until it dried up in 1950. Hundreds of wells drilled into the Floridan Aquifer may have caused the demise of the springs. Its site is located near the northern end of Peace River, approximately 3/4 mile east of U.S. Highway 17 and 4 miles south of Florida SR 60 / south of Bartow.
The Closed Basin Project is a groundwater extraction project in the San Luis Valley in Colorado, United States, that began in the 1970s, and remains in operation in the 2020s. The project is managed by the United States Bureau of Reclamation.
Las Moras Springs,"The Mulberries" in Spanish, are a group of springs near Brackettville in Kinney County, Texas.
Shoal Creek is a stream and an urban watershed in Austin, Texas, United States.
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