Dripping Spgs, TX 78620 . Reservations required to visit Hamilton Pool Preserve. . Please make your reservation before you arrive at Hamilton Pool Preserve. Extremely popular attraction. Advance reservations required (pretty much booked every weekend. read more. Reviewed yesterday. Tmb1021. ,. Houston, Texas. Hamilton Pool Preserve is a historic swimming hole which was designated a preserve by the Travis County Commissioner's Court in 1990. Located 3/4 mile . Feb 26, 2018 - Texas doesn't usually conjure visions of emerald green pools and flowing waterfalls, but Hamilton Pool Preserve, about 23 miles west of Austin, .