The spring is the second-largest fully submerged cave system in Texas.
The main cave passage extends for 4,300 feet, featuring complex chambers and restrictive tunnels.
The spring is the headwater of Cypress Creek, which eventually feeds into the Blanco River.
Geologists classify the site as a karst spring, where water emerges from dissolution cavities in limestone bedrock.
Swimming was historically a popular pastime, but access is now strictly managed to preserve the ecological integrity of the cave.
Exploration of the deeper cave chambers is restricted to certified cave divers with permits due to hazardous conditions.
Jacob’s Well is a perennial artesian spring situated in the Texas Hill Country that releases thousands of gallons of water per minute from the Trinity Aquifer. The water maintains a constant temperature of 68 degrees Fahrenheit year-round. The primary feature is a submerged limestone cave system that reaches depths of over 140 feet. The site encompasses 81 acres of protected natural habitat, including riparian forests and bluffs. Swimming is seasonally regulated based on water quality and safety conditions. Visitors must traverse natural trails to access the creek bed from the parking area. The surrounding terrain consists of diverse karst topography common to Hays County.
The elevated observation deck overlooking the spring opening.
Reservations are mandatory for all visitors to access the site.
Wear sturdy water shoes with good grip, as the limestone rocks near the water are slippery.
Bring your own drinking water, as facilities are limited once you descend to the creek area.
Do not attempt to swim or visit without a confirmed, pre-booked reservation.
Swimming is typically restricted to the summer months; the park may close access during periods of high water or poor water quality.
No cliff jumping or diving into the spring; smoking and alcohol are prohibited; leave no trace of trash.
