The San Marcos River is fed by the San Marcos Springs, which are the second-largest collection of springs in Texas.
The river provides critical habitat for several endangered species, including the fountain darter and the San Marcos salamander.
The park land was originally known as Burleson Park before being renamed to honor Texas State alumnus Frank Sewell.
The river's constant temperature allows for swimming even during cooler months.
Sewell Park is a recreational hub situated directly on the banks of the San Marcos River within the Texas State University campus. The site is centered around the spring-fed San Marcos River, which maintains a constant water temperature of approximately 72 degrees Fahrenheit year-round. It features extensive riverfront access for swimming, tubing, and kayaking. The park serves as a social gathering point for university students and local residents alike. Facilities include sand volleyball courts, picnic areas, and paved walking trails that connect to the broader San Marcos trail system. The river environment is protected, and the park is a primary access point for the river’s unique aquatic ecosystem.
From the bridge spanning the river, looking upstream toward the spring-fed headwaters.
Bring water shoes to navigate the rocky riverbed comfortably.
Check the university's official website for current water quality and swimming status updates before arrival.
Pack a waterproof bag if you intend to bring electronics near the water.
Do not attempt to feed the wildlife or disturb the protected aquatic vegetation.
The park may experience restricted access or closures during periods of high river levels or university-specific events.
Swimsuits must be worn in the water; glass containers are prohibited on or near the river to protect the ecosystem.
