Not to answer for txflake, but Lake Travis is just west of Austin, Tx.
Lake Travis does have some large catfish around Mansfield dam. I had some diving buddies who actually saw some well over 10' long. A friend had one on a trot-line that was longer than his boat was wide.
There are also some alligator gar that are about the same size. My neighbor had one on a jug line several years ago that was 8.5' long. Scared the heck out of him when he tried to pull in the line.