Right about now coming out of the spawn vertical structure is real handy to have for black crappies. Dock pilings/posts that run into deeper water can hold decent fish. Bridge pylons that run down into the water are also good spots to consider.
Something many people fail to pay attention to is shade. On bright days crappies will look for shade, they prefer to not be in bright light. Dock pilings and bridge pylons can be hot if they offer at least partial shade. The sunken wood also offers shade so your approach on bright days [not an issue of late] to crappies will be best if you focus on the shaded portion of the water column from mid-morning until mid to late afternoon.
Another thing to consider is to fish from the top down all the way to the bottom. Crappies can be notorious for being just under the surface or all the way down when on structure like this. If they are scattered down along the piling or wood you can keep in fish by catching those highest and working your way down. If you fish deep first and get into fish you may mess up or spook an area holding shallower but larger fish by hauling fish past or thru those that are shallower.