It might work better from a boat vs. the bank -- a fast, full sink (something like a 'depth charge') counted down for a full minute (or whatever puts you near bottom based on the grain weight and diameter) and you might pick up one of the 20,000 blue catfish or the 1 longnose gar (Herbert) under there.
We don't enjoy fly fishing extremely deep water like that. I like lots of light penetration and photosynthesis where I'm fly fishing -- that's more fun to us, and it's all about "fun" (the stuff above ^^ isn't fun to us, we'd rather use cut bait or live mummichogs for that). I attached one we caught a few years ago in that area (see the bridge in the background) --
We = Beth and I, I haven't switched prescriptions or anything.
Signed,
Bill