I would talk to the folks at the Dale Hollow One Stop in Celina if you are near it. Beyond that right now the lake is rising a small bit. Smalllmouth will hold at 10 to 15feet deep and also at 20 to 25 feet deep.
Reason for this is Threadfin Shad and Alewife.
Threadfin stay shallower and Alewife will stay deeper.
We use the Float and fly method of fishing for the 10 to 15 foot deep fish..
to learn float and fly go to www.FloatandFly.com and read how to rig and to fish it.
Bluff walls and main lake points above First Island are great places to fish. The area around First Island has a lot of great places to fish. Steep banks where the fish feel comfortable whent he lake is dropping would be the best now.
If you are interested in a guide..
www.BobCoan.com
www.BobbyGentry.com
or www.1fghp.com/dale.html \
Site may be down so call me for other guide names.
502-636-1305