Devil's Sinkhole State Natural Area, formerly part of the
Whitworth Ranch, is a 1859.7-acre area located approximately six
miles northeast of Rocksprings in Edwards County. It was
acquired in 1985 and was opened to limited access in 1992. The
Sinkhole property does not front a public roadway.
attraction is the Devil's Sinkhole itself. It is a vertical cavern
with an opening measuring approximately 40x60 feet and a vertical
drop to the main cavern of about 140 feet. The main cavern is
circular and reaches a total depth of 350-400 feet.
Access to the park can be obtained only by contacting Devil's
Sinkhole Society 830-683-BATS (2287) to prearrange a tour. Tours are
by reservation only.
The Devilís Sinkhole Society now offers Evening Bat Flight tours
throughout the summer and Guided Nature hikes on the first and third
Saturdays of every month except during hunting season. Day tours can
be arranged with a minimum of three days notice. Reservations are
Nearby attractions include Kickapoo Cavern S.P., South Llano
River S.P., Garner S.P., Lost Maples S.N.A., Devil's River S.N.A.,
Hill Country S.N.A., Seminole Canyon S.P. & H.S., and
development was completed in September 1996 including picnic sites,
a chemical toilet, and some trail development. A new wheelchair
accessible viewing platform is now available and allows visitors to
look into the Sinkhole.
the depth of the cave reaches below the water table, there are
freshwater lakes around its perimeter. These lakes support two
unique organisms; one, an endemic amphipod, and the other, a rare
aquatic isopod. Both these organisms are crustaceans. Also, the
walls of the vertical shaft of the cave support a Mexican fern
species found in few other locations in the United States.
The most obvious life form found in the Sinkhole is the large
seasonal population of Brazilian freetail bats. These small,
flying mammals put on quite a show in the evenings when they leave
the cave to forage. A population of from three to four
thousand cave swallows inhabit the cave at night while the bats are
The remainder of the park property is typical of the Edwards
Plateau. There are rather deeply cut canyons on the southern
end of the site. These canyons provide a more mesic environment and,
therefore, support trees such as escarpment black cherry, Buckley
oak, Lacey oak, and pinyon pine. Plateau liveoak is the dominant
tree species on the uplands. Two endangered species now inhabit the
park, as a growing population of breeding Black-capped Vireos and
Tobusch fishhook cactus now occur on the park site.
Devilís Sinkhole State Natural Area is limited to guided tours and
reservations are required. Visitors can visit the Rocksprings
Visitors Center located on the town square at 101 N. Sweeten Street
in Rocksprings. All tours meet at the Visitors Center.
Rocksprings is located at the junction of State Highway 55 and US