I've had hit and miss luck at Buckhorn. Been on the weekend and caught 30 bass and then the following weekend caught zilch and the weather was the same both weekends. Are you particularly looking for white perch? Most of the bass will be in deeper water trying to stay cool. I'd try texas rigged soft plastics, deep crank baits, and jigs this time of year. If you are looking for perch, stay towards the shallows with beetle spins and blue fox minnows. Or stick close to the dam with some cut bait on the bottom for some cats. There have been some nice ones caught out of there.