I used cinder blocks and chain (4 blocks chained to 3/8" line) on 2 sides of the raft in about 18 ft of water. During fall close up I attached an empty bleach bottle to the ropes and floated it about 3 ft below the surface to account for winter draw down.
A word of caution - check the chain after a few years. On a whim I dove down after two or three years and found that my 1/2 inch chain and shackles were only 1/8 inch. Rather then try to thread new chain thru a jumble of cinder blocks and installing new shackles at 18 ft while free diving I bought new blocks and started from scratch.
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