The abundance of June rain and run-off also carried down deadfall and other woody debris to add to the subsurface structure, actually enhancing bass habitat.
The key to catching bass is to find structure and work it at all levels.
Anchoring at the edge of weed beds, drop offs, or by submerged trees, and other structure using a sink-tip or sinking line is effective. Let the fly sink to the bottom then begin retrieve. Alternate between quick strips and pauses.
Top water fishing can also be good. Using poppers or any larger dry fly pattern from mouse, to hopper and even stimulator patterns have caught bass on the PdO.
I caught a lot of bass that afternoon, most of which were between 8-12 inches, but I lost about a 4-lb. lunker at the boat and landed a couple about 16 inches.
With bullet-proof durability bass will continue to thrive in the slow, warm water habitat. There are big bass in the PdO, and despite being an alien species, the reservoir is without a doubt an under-utilized fishery.