Dive Conditions – Updated 12/21/2016 ! Lake Jocassee – Temperature is around 59º down to 90 ft. There is no noticeable thermocline… ……GRAVEYARD…..Temp. 59°…….LAKE KEOWEE – @ The Hot Hole…Temp:75º …..@ the Pump House…..Temp: 59º ……………Cooper River….Temp: 52°….3ft. vis….Call any time for charter info.