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General Information


24300 Hamilton Pool Rd.
Dripping Spgs, TX
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Hours of Operation

9 am – 6 pm. Recreational activities end at 5:30 pm. No entry allowed after 5:30 pm. Reservations will be required to visit beginning March 1, 2018. Call 512-264-2740 for updates on the preserve status on the day of your visit.

General Information

Acreage: 232

Park Fees
(reservation fee required in addition to park entrance fee)

Nearby Parks

Travis County Parks

Hamilton Pool Frequently Asked Questions


Isn’t Hamilton Pool just a swimming hole?

Hamilton Pool Preserve is much more than a beautiful place to swim. It is a nature preserve in the federal Balcones Canyonlands Conservation Plan. It is habitat for a wide variety of plants and animals, including the federally endangered Golden-cheeked Warbler. Our mission includes protecting the fragile canyon so that future generations may enjoy it, as well as providing a place to take a swim in a natural setting. Enjoying the natural beauty of the canyon is the most common activity. Some people are surprised to hear that our busiest days occur when swimming is not allowed.


When do I need a reservation to visit?

We require all visitors to have reservations from May 1, 2017 through September 30, 2017.

Why do we have a reservation system?

Hamilton Pool Preserve has become extremely popular in the last decade. The small canyon can accommodate only a limited number of people. The number of people trying to visit the preserve on a typical warm weather day greatly exceeds the number of people that are allowed to enter. As a result, most people are turned away after making a long drive to the preserve. The reservation system prevents people from making futile drives to the preserve when there is no room for them.

If I park outside the preserve property can I just walk in?

No. The reason we restrict the number of visitors who can be in the preserve is that the canyon can accommodate only a limited number of people. Parking outside the preserve property does not address the overcrowding issue inside the canyon. Furthermore, Hamilton Pool Road is a narrow road with little or no shoulder and is not safe for parking. The shoulder of the road is a posted No Parking Zone.

How do I make a reservation?

Go the Travis County Hamilton Pool Preserve web page, read about the preserve, and then click on the Reservation Link. Choose a date and a time period, morning or afternoon, and pay for your reservation by credit card online. You’ll later pay again with cash when you purchase your entrance permit at the preserve.

How many people or vehicles can I bring on one reservation?

Your reservation will allow you to bring a maximum of one vehicle into the preserve. A maximum of 8 people can enter on one reservation. If you want to bring more than one vehicle, then you’ll need to have more reservations. If you are bringing more than 8 people then you’ll need to have more reservations.

Can I cancel my reservation and get a refund?

No, the reservations are final and cannot be modified or cancelled. Although the reservation fees are non-refundable, you will not be charged the $15 per vehicle entrance fee if you do not come to the preserve to use your reservation.

Can I change the date and time of my reservation?

No, unfortunately, the reservations are final and you cannot change the date and time once you have made the reservation. If you decide that you would rather come on a different date then you must make a new reservation for that new date.

How much will I pay to come to Hamilton Pool Preserve with a reservation?

The typical total price for visiting Hamilton Pool Preserve is $26 per vehicle per morning or afternoon time slot. Typical vehicle fees are as follows:

  • $10 Reservation Fee – paid online with credit card, not refundable.
  • $1 Credit Card Service Fee – paid online with credit card, not refundable.
  • $15 Entrance Fee – paid at Hamilton Pool with cash or check, no credit or debit cards accepted at the Preserve. Temporary checks are not accepted.
Exceptions for the Entrance Fee:
  • With a valid Travis County Parks Annual Permit, a current Travis County Parks Day Use Permit, a person 62 years of age or older as an occupant, or for a Disabled Veteran providing Veteran Administration’s written documentation stating that an occupant of the vehicle has at least 60% service related disability, the Entrance Fee is $5 per vehicle.
  • The fee for pedestrians and bicyclists is $8 per person per reservation time period, plus the reservation fees. Maximum of 8 people per reservation.
  • There is an additional $5 trailer fee for vehicles with trailers.
  • Note: fees paid at the preserve must be paid in cash or check, no credit cards.

Do I get a refund if I do not use my reservation?

No. All fees are non-refundable. No refunds are granted for unused reservations. You typically pay a total of $11 to make your reservation and an additional $15 per vehicle once you arrive at the preserve. If you do not use your reservation then you would not be charged the $15 per vehicle entrance fee, but the $11 reservation fees would not be refunded.

How do I use my reservation when I arrive at the preserve?

Please have your reservation receipt ready and easily available to show to preserve staff when you arrive. You can either show us a printed copy of your receipt or a digital copy on your phone. Your receipt will be emailed to you soon after making the reservation. The email will have “Hamilton Pool” in the subject line.

When are the reservation periods each day?

We have two reservation periods every day. They are 9 am – 1 pm and 2 pm – 6 pm. Each reservation period requires a separate reservation and entrance fee. On each day, all recreational activities, such as hiking, birding, and swimming, will end at 12:30 pm and 5:30 pm. All visitors must return to their vehicles so that they can exit the preserve by 1 pm and 6 pm respectively. For the morning and afternoon periods, no entry is allowed after 12:30 pm or 5:30 pm.

Do I get a refund or get to reschedule if swimming is not allowed during my reservation time?

No. Swimming is not guaranteed with your reservation. Whether swimming will be allowed during your reservation period is largely determined by unpredictable factors such as recent rain fall and the latest bacteria counts. Hamilton Pool Preserve is not just a swimming hole. The most common activity is enjoying the natural beauty of the canyon and the water fall. Our busiest days occur when swimming is not allowed. See the Swimming Section of the FAQ for more information on swimming.

What happens if the preserve is closed to all visitors due to dangerous conditions caused by heavy rains?

Following or during heavy rain events that cause flash floods in the canyon, or the potential for floods, staff will close the entire preserve to all visitors when the danger becomes apparent. In the event this happens during your reservation period, you will receive instructions via email as to how you can reschedule your visit to Hamilton Pool at no extra charge. We allow visitors to reschedule their reservations only in the rare event that we close the preserve to all visitors for safety reasons.

Can I use reservations for commercial purposes?

No. The purpose of the reservation system is to allow the general public, like individuals and small groups or families, direct access to Hamilton Pool Preserve without needing to go through a commercial company.


Are lifeguards on duty at the preserve?

Are lifeguards on duty at the preserve? – No lifeguards are on duty. Swim at your own risk. The pool is 25 feet deep at its deepest, and there have most unfortunately been drownings in the past. Please use caution if you plan to swim.

When is swimming allowed?

Typically, swimming is allowed when we do not suspect that bacteria counts are too high to meet health standards. We test the water for bacteria at least once a week, often twice a week in the summer. We don’t allow swimming following a significant rain, or after our water sample shows a high bacteria count. Since the bacteria counts and the weather are both hard to predict, it is not possible to say with certainty far in advance when swimming will be allowed. Historically, we have sometimes prohibited swimming early in the summer for Cliff swallow birds that nest above the pool and contaminate it, thereby raising the bacteria counts for a couple of weeks. Even this phenomenon is difficult to predict.

If swimming is not allowed, what other activities are there to do?

Most visitors enjoy hiking to the pool and photographing the waterfall, as well as relaxing on the beach or in the shade of the rock overhang. On most occasions, you can also hike two-thirds of a mile through the plush canyon to the Pedernales River.

What type of bacteria causes the problem with swimming?

Although we test for E coli bacteria, the most serious threats are a multitude of other bacteria that are associated with E coli. It lives in the intestines of warm blooded animals, along with lots of other infectious bacteria. We test for E coli because both the State and the EPA suggest testing for E coli.

Following a heavy rain, how long will the bacteria level remain high?

This can vary greatly, from just a few days to a couple of weeks. Generally, the greater the rain fall the longer the time for the bacteria counts to fall. It is common for the counts to return to safe levels after a few days.

Can we guarantee safe bacteria levels on days when we allow swimming?

Can we guarantee safe bacteria levels on days when we allow swimming? – No. We try to make timely management decisions by monitoring rainfall daily and testing the water regularly, but there can be a delay from the time bacteria levels rise and the time we detect the rise. As with swimming in any natural body of water, you should swim at your own risk.

General Questions

How did the pool form?

Hamilton Pool is known as a collapsed grotto. The overlying limestone is more resistant to erosion than the underlying rock. During flood events the lower rock gets eroded more than the rock above. Eventually this causes a large overhang that is immediately obvious to visitors at the pool. As the erosion process continues, the overhang will eventually collapse and the process will begin again, with the waterfall moving back a little with each collapse. This erosional process has been occurring for roughly 100,000 years, with the waterfall moving backwards up the canyon roughly two-thirds of a mile in that time.

How deep is the pool?

The pool is usually measured to be about 25 feet deep at its deepest, but the depth varies due to the boulders and irregular bottom.

What types of plants and animals do we have at Hamilton Pool Preserve?

This is too involved to give a detailed answer, but we have a wide selection of life that is native to central Texas. Just some of the animals include fox, bobcat, porcupine, skunk, White-tailed deer, possum, various species of mice, sun fish, carp, various snakes including water moccasins, large variety of insects, and many other species. We even have some probable sightings of mountain lion, although those are rare. If you are interested in birds, we have a great many to look for, especially in the spring as the migrants pass through. Ask for our Hamilton Pool Preserve Bird List at the entrance booth. Our most famous bird is the federally endangered Golden-cheeked Warbler.

What types of land management projects occur at Hamilton Pool Preserve?

We and other agencies conduct bird surveys, especially for the Golden-cheeked Warbler, deer censuses, juniper control in certain areas, prescribed burns, non-native species control activity, erosion control, and miscellaneous other species monitoring projects.

Are drones allowed?

Drones are not allowed at Hamilton Pool Preserve, but they are allowed at nearby Reimers Ranch Park, as long as they are not flown over other people.

Are guided tours provided?

We provide guided tours only on Saturdays at 10 am during the months from October through April. We also offer a written self-guided tour brochure that will identify points of interest at various numbered stops along the trail.

Why can’t I bring my pet?

Hamilton Pool Preserve is a nature preserve that is part of a larger federal preserve. We are bound to follow the policy of not allowing pets. Pets can disrupt the behavior of the native animals even after the pets have left. They are not allowed to stay inside the vehicles either. Pets are welcome in nearby Reimers Ranch Park, another Travis County Parks only a mile away. There is lots of room for hiking at Reimers Ranch Park.