If you plan to build a brush pile or twenty don't waste your time building a small one. Small condo's or piles built from small tree trimings just don't last or hold many fish. Do this on private property where you have permission.
This tree fell over due to erosion. Pick a portion that had as many large branches as you can tow with your boat. Add sufficient weight on the shore then tow to where you want it.
This pile was placed 20' deep and ten days later produced 57 fish in one hours fishing.