Editing Barton Springs (section)

==Other springs==
[[Image:Eliza spring.jpg|right|thumb|200px|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 {{convert|3|e6USgal|m3}} 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|Balcones Fault Zone]] and features other, smaller springs.  For example, about one mile (2&nbsp;km) 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.<ref>{{cite web |url= http://impactnews.com/southwest-austin/124-history/9125-barton-springs |title= Barton Springs |author= Lai, Valeria |date= July 23, 2010 |access-date= Sep 11, 2011}}</ref>