will fresh cut oak slash of decent size stay put, or do i have to tie a block to it?  

the branches are about 4 inches in diameter and 15 feet long.  i have done a few in the past and had them stay in the same area, but someone said if i dont put a block on them, theyll move.  true or false?

thanks.

Wood floats. Tie them down.

Take how much weight you think you need(concrete, blocks, etc.) and triple that mount to ensure that it stays down.  I learned this the hard way and picking up brush piles after they have floated to shore, adding weight, and replacing them is a pain in the bass.

Definitely weigh them down. You'll be glad you did.

Fresh cut Oak branches will not float for at least 6 months... Branches are not as dense and more porous then a log and that helps them sink for now... However I'm with all the others on here I would definatley say tie it down. You don't want to start a little cover and then let it move on you!

Good Luck To You!!! 8-)

When we are looking for something to weigh them down we find a brick company in the area and go ask if we can have some of their broken bricks. They have alway said yes and I've been to several different companies.

Are you planting brush in your dads lake or somewhere else?

Are you planting brush in your dads lake or somewhere else?

a private lake, yeah.  i read up on the fines for "somewhere else"