Did you hit the line? Odd that you got 77 on the bottom...a few weeks ago I got 72, but now that you mention it, I didn't notice a thermocline dropping into the riverbed this week. Never checked temp though. Did the lake turn in the last few weeks?
We've noticed lots of dead little fish too...and the lovely stinch of H2S. Vis Wed night was about the same @ depth...maybe 8ft in the riverbed at best...
Yep it was still nice and 'cozy' on the river bed (both my computers had same readings on temps)....did not notice the odor or any sights of dead fish--hmmmm. The lake will not turn until the surface water cools sufficantly for it to sink forcing the bottom waters up. Vis like I said was at least in my standards good at depth.