I wandered into the preserve from St. Edwards and did not see any signs for the need of a permit...Hmm?  I should have actually read the sign.  Makes sense, I guess.  As a passive user sticking to the trail, you might be able to talk your way out of any citation if you bump into City personnel.  Seeing that Feb-Jun is the breeding season for the golden-cheeked warbler, it's probably not a good idea to get caught in the preserve without the proper authorization during those months.

This is a gem of a little hike and allows an excellent glimpse of the attributes driving conservation efforts within Austin and the Hill Country.  My dog absolutely loves the numerous creek crossings and meeting all the other dogs and people along the way.  Most folks were out with their dogs and there was one group seeking a glimpse at the all elusive warbler.  I was able to hear at least 7 golden-cheeked warblers while hiking around the loop and near the parking area.  Only a couple were using the primary call (call I), with the majority using the secodary (call II), and call III every once and awhile.  Between mile markers 0.5 to 1.5, there was a warbler near each of the quarter-mile markers, typically on the opposite hillslope as the previous one.  The trail is well defined and lined with limestone rocks.  It's encouraged to stay on the trail and respect the habitat of rare and endangered species found in this area.