Robert ... I don't know if the White Bass "stay" in the upper river area all Summer, but having caught my fair share of them in most all areas of the "lake" I'd have to say that they probably migrate ... or at least a substantial percentage of them do.
When I say "lake" I am basically referring to all the water downstream of the quarry (just my interpretation, though). And I will have to admit that the largest concentration area where I've caught these fish is in the "horseshoe bend" area & the Chowning ramp area. I've caught them in the Settlers Trace Marina/Beech Creek & Little Beech Creek areas ... but, only a few of them & only on rare occasions. But, in either instance, I was not specifically targeting them.
And yes, I do know the difference between a White Bass & a Hybrid Striped Bass. (just a FYI to the Keyboard Police ... LOL !! )