All I can tell you about that part of Cumberland Lake, is that my Mom & Stepdad used to have a place at Jasper Bend. They launched at the ramp there and trolled upriver along that bank with "Sparkletails" (jointed crankbait of old) and caught many nice Crappie, back in the day.

Looking at Google Maps, the area around the Rockcastle ramp (and right out in front of the ramp) is full of submerged trees ... now that the lake is back to normal water levels.

You might also want to look here : Nashville District > Locations > Lakes > Lake Cumberland > Recreation > Fishing > Daily Fishing Update