The Preserve was set aside to buffer some of the ecologically sensitive karsts in the area from encroaching neighborhoods. Karsts are caves that feed directly into the Edwards Aquifer below ground.
Because the three caves can be dangerous to hikers and nonprofessional spelunkers, they are all closed off now. Again, trash is always a concern at the entrance to the aquifer, and the caves are homes to frogs, toads, spiders, scorpions, as well as a large colony of bats. One can arrange a private tour through the Austin Nature Center at (512) 327-8181.