The terrain underwater doesn't change from what is above the water in a man made reservoir. When you drive to the lake the road is following structure because it's usually located on the valley floor winding along next to a creek or wider open areas with hills and additional valleys.
When a dam is constructed the valley is filled with water covering the same terrian. Looking at topo maps of your area you can see the terrian changes in 3D and get a visual of what the map is showing using elevation lines.
Being able to interpret maps into a 3D visual is critical to the off shore angler. Today's sonar units do a good interpretation electronically but you still need to be able to see the big picture to put the terrian into perspective.
Bass like changes in depth that give them an advantage to catch prey or use as a resting/sanctuary holding area. Largemouth Bass also like to be able to move up into shallower water and down into deeper water without needing to relocate a distance longer than a few hundred yards if possible, Smallmouth tend to roam further distances making more severe depth changes.
What I look for;
1. What depth are the bass and bait using now? I use my sonar unit in and around the marina to get some idea what depth the life zone is that day.
2. Where are the bass and bait most likely to be located based on seasonal preference.
The answer is what type of prey is most abundant during this time period, bass don't need to go deep if the prey is shallow and will not stay shallow if the prey is deeper. The reason is bass use their air bladder to neutralize bouyancy when resting, so there is a comfortable depth range you see when bass or baitfish are suspended and this depth is what I refer as the life zone you look for with sonar or visually.
So let's apply your shallow water knowledge to deeper water structure. Along the shore you look for places the bass uses to ambush prey like aquatic cover changes in weed types creating a hiding place. Deep structure has different elements that provide hiding places like rock piles, sharp breaks, stumps, trees, brush, undercuts, culverts, bridges, road beds, draws, old walls, fences, foundations and river/creek channels.
3. Meter before you start fishing. This is counter productive for shoreline anglers who like to stop and start fishing at good looking areas. The deep water angler is looking for fish on breaks trying to determine what depth to start at and what lures should be productive at those depths. When you reduce the lake to a depth zone the size shrinks quickly because few bass holding structures are present at any specific depth zone. Long points, humps, that have breaks like small flats and saddles are good starting areas.
Good luck.
Tom