Location Hamilton Pool Preserve is located about 30 miles west of Austin on FM 3238. The entrance to the 232-acre preserve is on the right. The preserve's pool and grotto were formed when the dome of an underground river collapsed due to massive erosion thousands of years ago. Swimming is allowed only when the water quality meets safe standards.
Water quality is monitored regularly.
The parking lot is sized for 75 cars, and when all spaces are taken, cars are held up at the gate until a space opens. Travis County honors the Federal Golden Age Passport and the Senior Citizen State Pass. Pets are not allowed, even on leashes. Neither are visitors allowed to leave pets in cars while they hike and visit the water fall. Visitors to Hamilton Pool, please leave your pets at home for this excursion.