Swimming not allowed at Hamilton Pool Preserve for ‘foreseeable future’ The stunning swimming hole is located near Austin Tags: TRAVIS COUNTY – It’s bad news for visitors hoping to swim at Hamilton Pool this summer. Due to falling rocks, Travis County Parks officials will not be allowing swimming for the foreseeable future. An update on the Hamilton Pool website says rocks have been falling “with increased frequency at many locations in and around the pool” following the big freeze in February. Hamilton Pool Preserve, which was closed for most of 2020 due to the coronavirus pandemic, is known for its 50-foot waterfall which cascades into a natural swimming hole.