Thanks guys - great ideas!
I happened to talk to my bro-in-law tonight. He's works for Fish and Game. He suggested constructing a crib out of timbers, and putting the block in there. That, of course, leaves the problem of getting it to sink evenly in the spring...
He also mentioned that the water gestapo (MN DNR) forbids using cinder block for riprap on lakeshore, but he didn't know why. He speculated that it might leach one of its component chemicals and thought I should contact the DNR just to make sure. Anybody heard of the logic behind this one?
