Jacob's Well is the second-largest fully submerged cave in Texas. The source of the water comes from the Trinity Aquifer, which makes its way from an extensive underground cave system. The deepest part of the cavern system is 140 feet deep.
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The well takes an initial plunge through 23 feet of well-lit water to an apparent bottom, but then it veers off into a descent of increasing darkness. I visited with Gregg Tatum who has logged over 250 dives there. He says it is no place for a novice.
About Jacob's WellThe settlers didn't dive into it, of course, but treated it instead as a drinking fountain and later used it to power a saw mill. They named it Jacob's Well because of its biblical magnificence. Since the well was discovered, at least 4,500 feet of it has been explored.
Temperature of the water in Jacob's Well remains a near-constant 68°F and visibility is typically excellent. The spring provides habitat to numerous species of fish (principally sunfish and perch); turtles; aquatic insects; crustaceans; and, most notably, the cave-adapted Fern Bank salamander (Eurycea pterophilia).
The few who have seen the fourth chamber say it is virgin cave with fantastic limestone formations and no gravel. Covering the bottom is fine silt that can totally obscure vision when kicked up by one misstep. Ironically, there was a time when it was impossible to descend into Jacob's Well.
As of June 29, 2022, swimming will not be allowed at Jacob's Well Natural Area (JWNA) for the foreseeable future. The threat of high bacteria levels, other pollutants and poor visibility conditions are unsafe for swimming.
The swim spot has been closed since June 2022.It has been over a year since one of the most popular swim spot in the Texas Hill Country had enough water for guests to enjoy.