I was just there for the 4th of July week vacation, first time to Lake Anna, we rented a house for the week. Turns out it was on the "hot" side which is also the "private" part of the lake. I must say, those living on the private part of the lake have it made in the shade, hardly any boat traffic compared to what the public lake experiences, and fishing was pretty decent probably due to the greatly reduced fishing pressure on that part of the lake.
The down side was the water temperature was insane, 90+ degree water temp, sometimes reaching 95+. It was a hot week air-temp wise and the bass still felt warm to the touch when taking them out of the water. Amazingly, the bass fishing was still pretty good even with the water so hot. I caught multiple 1 to 3 pound bass in 2-3 foot of water near boat docks. The last one we caught in this weight class really struggled to recover after being caught, we thought the fish was going to die. We jumped in the water and swam with the bass to keep water going through the gills and help it along, it finally swam off slowly heading for deeper water, so I think it made it. Still, the water temps... good lord I've never seen anything like it!
I don't know how the hot side isn't infested with more ecoli and covered in algae with water temps staying that hot all summer long! Seems water that hot would cause a lot more problems than it seems to.