Very nice catch! The Pedernales is one of the most underrated rivers in the state. Maybe that's a good thing since that means less pressure and crowds. It is usually very wadeable for long stretches and has great public access through the state parks in Blanco, LBJ, and the Falls. It's also loaded with fish, including some of the best carp fishing in the state. If you can get a carp to bite in that crystal clear water, you can do it anywhere.
Yes, the Perdernalis is underrated. My spot is towards the Fredericksburg area. Lot's of bass and tons of carp. Have yet to catch a carp. Shallow wading and great visibility.