In the spring most bass will begin to move toward shallow water in preperation of spawning. During that time they will stage at different spots, what you need to do is find out where the fish spawn at and then you can back track their migration route and intercept them. The thing you need to look for is structural changes, not cover, although cover on some sort of structure is the best. Cover consist of brush piles, laydowns, weedbeds and things like that, structure consist of changes in the lake bottom like drop offs, creek channels, ditches and depressions, When the fish begin to migrate they usually follow a route moving from deep water to shallow water by way of following structure, they may use points or drop offs as a place to stage, look for shallow areas that have quick access to deeper water, long tapering points are a great place to start the search. You can tell a lot about the fish that are deep just by looking at how they are relating to structure, if the fish are suspending in 45' of water while in 60' they will be hard to catch but not impossible, jigging spoons are perfect for that scenario but you'll need to rely on your fish finder. I aaume you have a fish finder if you are determining the fish are deep, you also need to determine if the deep fish are bass or perhaps another specie, generally the way you do that is by seeing the size of the arcs or fish i.d. depending on the type of finder you are using.