There's a creek that enters the river just upstream of the 1st tube chute that has a pool area about 12-15' deep. It's real close to Hinman. The rest is about 6' deep, but with the recent rains it may be a tad deeper. It's excellent buoyancy practice, especially for dry suit, since it's so shallow - just gliding along the bottom.
An instructor friend of mine just tried a class there this morning. He had to call it after Dive 1, because the current was too strong for the skills (he'll be moving to Canyon Lake tomorrow). I've seen classes there before, and I did some Public Safety diving training (and Swiftwater Rescue) there.
By the way, any oil rigs left? My wife and I enjoyed the ones we did years ago.