Tbar can you float them on something and into place? How deep is water at end of your pier?
I don't know about floating them. In parts of the pond the bottom drops away pretty fast. I figured I would get them out as far as I could with the tractor forks and heave ho. Water at the end of the pier is in the 12'-14' range.
Fill with brush and give them a big roll off the end or sides if it’s deep enough
Filling with brush is an idea.