Join Date: Dec 2000
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On the depth: One foot between the bottom of your keel and the bottom of the ocean is not going to cut it. Even a fully buried mushroom type mooring will stick out from the seafloor in excess of one foot. Rocks, dragging, etc. would all also point to the need to have several feet of water to float in.
On the Mooring Type: You need to check with both your local harbor master and your insurance company. While people have used old engine blocks and the like, many harbor masters and insurance companies will not allow it. I would limit your choices to a metal mushroom, a concrete block, a Dormor, or a Helix system. The mushroom shape and the Dormor shape are specifically designed to bury themselves in the sea floor thus offering more holding power than their weight alone.
On the Mooring Weight: Heavier is always better. For your boat Newport would require a 300# mushroom. A Dormor of the same weight would offer considerably more holding power.
If you even trade up in boat size you will need a larger mooring anyway. Make sure you invest in chain and hardware of appropriate size as well as chafing gear.