According a blog post here, Lake LBJ is a great place to find catfish.
Lake LBJ Lake LBJ, so named after famed Texan and former president, Lyndon B. Johnson, is part of the Colorado River’s Highland Lakes. This huge lake spans over six thousand acres from Granite Shoals to Kingsland, Texas. The big three (flathead, blue, and channel) cat are abundant in this lake, and a day on the lake can easily net you a catch of forty plus fish in the 5 to 40 pound size range. Particularly good, is the spot where the Llano and Colorado rivers converge. This location is especially good during the winter months. This area provides great opportunities for those who prefer fishing the bank.
It’s not far from Inks Lake:

