Long a treasured swimming hole for Austinites and Univ. of Texas students, this grotto-like pool is one of Texas' most beautiful. 45-ft. waterfall spills into a deep, jade-green pool. (Note: Water quality carefully monitored and swimming not allowed when bacteria count is too high. Call ahead.) Other activities include picnicking and nature study. Guided nature tour by reservation. No drinking water available; no pets, glass containers, fires or cooking allowed. Take Texas 71 west approximately 16 miles to R.R. 620, then 1.5 miles to Hamilton Pool Road (F.M. 3238) south for 13 miles. Admission fee.