It's a long shoal that runs out to the green lighted buoy, mostly flat bedrock with an occasional bolder or larger rock. The buoy is placed in the deeper water out at the end, it marks the end. It's a gradual deepening shoal, so you don't want to get anywhere near the exposed west end. Half way out to the buoy it is still only about 6-8 feet deep at the shallowest. Small boats cross over it about half way to the buoy. What most boaters don't know is there is a ship boiler sitting on it from a wreck, about half way out, that is only about 4-6 feet under the surface, depending on the current lake water level. I've seen it while scuba diving. Larger boats with deeper draws will hit it, even smaller boats in waves or low water conditions. I saw parts of boats and yes, one outdrive (too old and damaged to salvage), on the shoal. Best advice is not to cross it much closer in than a hundred yards or so from the buoy if you have a smaller boat, but I'd play it safe and go around the buoy. That's why it's there. If you cross closer in you take the chance of hitting that boiler or anything else that may be hung up on the shoal.