<P> Jacob's Well is a perennial karstic spring in the Texas Hill Country flowing from the bed of Cypress Creek, located northwest of Wimberley, Texas . The spring is located on the property of Jacob's Well Natural Area (JWNA), managed by the Hays County Parks Department . The visitor entrance for JWNA is located at 1699 Mt. Sharp Road, Wimberley, TX 78676 . The 12 - foot (3.7 m) diameter mouth of the spring serves as a popular local swimming spot . From the opening in the creek bed, Jacob's Well cave descends vertically for about 30 feet (9.1 m), then continues downward at an angle through a series of silted chambers separated by narrow restrictions, finally reaching an average depth of 120 feet (37 m). Until the modern era, the Trinity Aquifer - fed natural artesian spring gushed water from the mouth of the cave, with a measured flow in 1924 of 170 US gallons per second (640 L / s), discharging 6 feet (1.8 m) into the air . </P> <P> Due to development in the area, the level of the Trinity Aquifer has dropped affecting the flow of water through Jacob's Well . In the modern era, what remains visible of the spring is a faint ripple on the surface of Cypress Creek . The spring ceased flowing for the first time in recorded history in 2000, again ceasing to flow in 2008 . This resulted in now ongoing measures to address local water conservation and quality . Hays County purchased 50 acres (20 ha) of land around Jacob's Well in 2010, in an attempt to protect the spring from development . An additional thirty - one acres was transferred to the county from the neighboring Jacob's Well Natural Area (administered at the time by the Wimberley Valley Watershed Association (WVWA)), the new, eighty - acre (32 hectares) named the Westridge Tract . </P>

Whats at the bottom of jacob's well
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