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Texas boasts a wealth of natural marvels, from mineral treasures to diverse landscapes ranging from Big Bend's canyons to the Panhandle's plains. The state also hosts a cave that shelters the world’s largest bat colony—over 15 million Mexican free‑tailed bats each summer. For a more tranquil experience, discover the world’s largest spring‑fed swimming pool, nestled in Texas.
Located in the Chihuahuan Desert, Balmorhea State Park houses a 1.3‑acre spring‑fed pool that receives water from the San Solomon Springs. Built by the Civilian Conservation Corps in the 1930s and inaugurated in June 1936, the pool has long attracted locals and tourists alike. Its generous size, crystal‑clear waters, and comfortable 72‑76 °F temperature make it ideal for swimming, snorkeling, and even scuba diving—a rare opportunity to enjoy a pristine natural oasis.
In 1935, 200 Civilian Conservation Corps workers quarried limestone to construct two bathhouses, a concession building, and the San Solomon Springs Courts motel. The pool opened during a grand two‑day celebration in June 1936, featuring bathing‑girl revues, swimming contests, and speedboat races on adjacent Lake Balmorhea.
While Texas also features Barton Springs in Austin, Balmorhea is believed to be the larger of the two. The 1.3‑acre pool reaches depths of 25 ft and stores approximately 3.5 million gallons of water that stays at a steady 72‑76 °F, mirroring the temperature of the surrounding limestone. Though Balmorhea is 7 ft deeper in some areas, Texas Monthly notes that definitive surveys to confirm which pool is truly larger are pending.
Located in the park’s northeastern corner, the pool receives over 15 million gallons of water daily from the San Solomon Springs. Texas State Parks estimates that this volume could fill more than 300,000 bathtubs each day. The water, however, undertakes a remarkable journey before reaching the pool.
The water that feeds Balmorhea originates from a vast aquifer located 400 mi northwest of the park. Rainwater seeps into porous limestone and fault lines, gradually making its way underground. When the pressurized groundwater reaches a fault, it springs to the surface as an artesian spring—the San Solomon Springs.
After traversing the pool, the water exits through the park’s unique spring‑fed marshes—cienegas—and canals, sustaining several rare and endangered species. These include two freshwater springsnails, a diminutive amphipod, and two West Texas‑endemic fish: the Comanche Springs pupfish and the Pecos gambusia. Prior to the pool’s construction, the springs drained into a natural cienega; the project replaced it with two engineered cienegas that now bolster local biodiversity.
After a 2018 fundraising campaign that raised over $2 million, Balmorhea underwent a comprehensive renovation completed in 2020. The pool now accommodates up to 900 daily visitors, a significant capacity for a spring‑fed body of water. It operates from 8 a.m. to 7:30 p.m., with closing times adjusted for sunset.
