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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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.
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.
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).
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.