The spring is the headwaters of Cypress Creek, which eventually flows into the Blanco River.
The cave system is one of the longest underwater cave systems in Texas.
The spring provides the primary water source for the surrounding ecosystem and regional wildlife.
Exploration of the deep cave passages is restricted to highly trained cave divers to prevent accidents and damage.
The water clarity is maintained by constant flow from deep underground, resulting in high visibility for snorkelers.
Jacob's Well is a perennial artesian spring that releases thousands of gallons of water per minute from the Trinity Aquifer. The water remains a constant 68 degrees Fahrenheit year-round. It features an underwater cave system that extends 4,300 feet in length and reaches depths of 140 feet. The swimming area is a natural limestone pool formed by the spring's outlet. Swimming is strictly regulated to protect the sensitive ecosystem and the health of the aquifer. The surrounding nature preserve covers 81 acres and includes hiking trails through Texas Hill Country terrain.
The elevated overlook trail provides a full view of the circular spring opening from above.
Reservations are mandatory for swimming and must be booked well in advance through the county website.
Bring water shoes to navigate the slick, uneven limestone rocks surrounding the spring.
Check the county website for status updates, as swimming is frequently closed due to bacterial levels or low flow conditions.
Do not attempt to enter the restricted deep cave areas or climb on the surrounding fragile rock walls.
Swimming is prohibited during periods of low flow or poor water quality; always check the park status online before arrival.
No scuba diving, no jumping from the surrounding cliffs, and no pets allowed near the spring water.
