... my guess would be that they're in the deepest part of the lake and suspended because of water temp, security, and feeding opportunities. And since the lake isn't all that big, or very wide, they really don't have far to go to get to shallow water or warmer water (if temps start dropping drastically). And with Alewifes being in the lake ... they're probably staying in the coolest layer of water they can find --- so the Bluegill are most likely suspending nearby

Looking at this map : I'd be looking at the deep hole on the East side of the lake (mid-lake). I'd also be looking at the knob point that juts out, just North of the deep hole. The steep drop in front of the private launch would be of interest, too.

... luck2ya ... cp