Lanier is my "home" lake. There are brush piles EVERYWHERE on Lanier. The most productive ones are under docks and deeper brush piles now summer is here. The Community Docks, multi-slip docks that are usually for a subdivision, always have crappie on them. They stay there year round. You will need side imaging to help narrow down the ones with fish under them. Some are really big docks with 20+ slips. It takes to long to check each one without it.