Texas swimming hole Jacob’s Well is open for reservations Spring-fed Jacob’s Well is a swimming spot in the Texas Hill Country Tags: WIMBERLEY, Texas – Jacob’s Well Natural Area in Wimberley is open for reservations for summer 2021. Reservations are required for swimming which will be allowed through September 30. Walk-ups won’t be able to swim, so make sure to reserve a time slot before driving to the artesian spring. Reservation fees are $9 for adults, $5 for Hays County residents, seniors, service members, veterans, children aged 5 to 12, and free for children ages 4 and younger. Arriving late for a scheduled swim reservation is allowed, but any swimming time missed will be forfeited. Each reservation guarantees a two-hour time slot for swimming.