The San Marcos Springs are the headwaters of the San Marcos River.
 The site contains more than 200 springs with water from the Edwards Aquifer and that discharge an average of 123 million US gallons (470,000 m³) of water daily, is one of the oldest continuously inhabited places in North America.
Artifacts discovered in digs conducted from 1979 to 1982 date back 12,000 years.

The first Europeans to visit the springs were probably Spanish explorers in 1689.
The springs were an important stop on the Old San Antonio Road and the Chisholm Trail.
In 1847, former Republic of Texas vice president Edward Burleson purchased the land surrounding the headwaters of the river and built a cabin on the hill overlooking the headwaters.
 Two years later Burleson built a dam just below the springs to power a mill.
This dam, which created Spring Lake, still exists today.
 A.B. Rogers purchased the property in 1926 and his son, Paul, developed a hotel there in 1928 and introduced glass bottom boats to the lake.

Spring Lake has been visited by notable individuals including Robert E. Lee, Jay Gould, and Helen Miller Shepard.

In the 1950s, construction of a submarine theater and large spillway at one end of the lake to produce a swimming pool led to the opening of Aquarena Springs, an amusement park, at the site in 1951.
Other features of the park were the Alpine Swiss Sky Ride (a Von Roll skyride), an Intamin 220 foot Sky Spiral that moved vertically above the lake and rotated 360°, and "Ralph, the Famous Swimming Pig" and "mermaid" performers that could be viewed from the submarine theater.
The park also included a coin-operated arcade in which human visitors would "compete" in games like Tic-tac-toe against chickens, whose "moves" in the game were determined by pecking lights which appeared only on the chicken's side of the machine.
 At its peak, Aquarena Springs attracted 250,000 visitors annually.

The center added a Wetlands Boardwalk in a shallow area of Spring Lake.
The boardwalk, made of recycled plastic lumber, floats on the water and circles a marshy area that showcases the flora and fauna of a wetland ecosystem.

Aquarena Center was designated as a "critical habitat," subject to the Endangered Species Act, because the springs are home to the fountain darter, the Texas Blind Salamander, the San Marcos Salamander, the San Marcos gambusia, and Texas Wild Rice.
The San Marcos gambusia may be extinct as none have been seen since 1983.
The San Marcos Springs are the headwaters of the San Marcos River.  The site contains more than 200 springs with water from the Edwards Aquifer and that discharge an average of 123 million US gallons (470,000 m³) of water daily, is one of the oldest continuously inhabited places in North America. Artifacts discovered in digs conducted from 1979 to 1982 date back 12,000 years.
The first Europeans to visit the springs were probably Spanish explorers in 1689. The springs were an important stop on the Old San Antonio Road and the Chisholm Trail. In 1847, former Republic of Texas vice president Edward Burleson purchased the land surrounding the headwaters of the river and built a cabin on the hill overlooking the headwaters.  Two years later Burleson built a dam just below the springs to power a mill. This dam, which created Spring Lake, still exists today.  A.B. Rogers purchased the property in 1926 and his son, Paul, developed a hotel there in 1928 and introduced glass bottom boats to the lake.
Spring Lake has been visited by notable individuals including Robert E. Lee, Jay Gould, and Helen Miller Shepard.
In the 1950s, construction of a submarine theater and large spillway at one end of the lake to produce a swimming pool led to the opening of Aquarena Springs, an amusement park, at the site in 1951. Other features of the park were the Alpine Swiss Sky Ride (a Von Roll skyride), an Intamin 220 foot Sky Spiral that moved vertically above the lake and rotated 360°, and "Ralph, the Famous Swimming Pig" and "mermaid" performers that could be viewed from the submarine theater. The park also included a coin-operated arcade in which human visitors would "compete" in games like Tic-tac-toe against chickens, whose "moves" in the game were determined by pecking lights which appeared only on the chicken's side of the machine.  At its peak, Aquarena Springs attracted 250,000 visitors annually.
The center added a Wetlands Boardwalk in a shallow area of Spring Lake. The boardwalk, made of recycled plastic lumber, floats on the water and circles a marshy area that showcases the flora and fauna of a wetland ecosystem.
Aquarena Center was designated as a "critical habitat," subject to the Endangered Species Act, because the springs are home to the fountain darter, the Texas Blind Salamander, the San Marcos Salamander, the San Marcos gambusia, and Texas Wild Rice. The San Marcos gambusia may be extinct as none have been seen since 1983.
Meadows Center for Water and the Environment