Have you ever swam to the bottom of Jacob's Well!? The artesian spring, Jacob's Well, is a favorite swimming spot in Wimberley and is also the head waters to Cypress Creek. The water is supplied to the spring by the Trinity aquifer, some 140 feet below the surface. Year round the water temperature is a constant 68(f) degrees. The cave system below is extremely dangerous to explore which has led to several SCUBA casualties in the past. Only permitted cave diving research professionals are now all