If you find out any info. please let me know. When walking my dog on Jupiter Beach, I have seen divers on small boats or kayaks diving the bridge debris pile, but have never seen anyone beach dive it. I picked up a book on shore diving at Force-E and the book indicates that it can be dove from the shore though it looks like it might be a bit of a swim (by the location of the anchored kayaks and small boats). Sometimes there is a bit of boat traffic in that general area too. I've also seen boats congregating there, I suppose to obtain bait fish.
I have heard that nurse sharks have been known to hang out there and a REEF diver mentioned to me a few months ago that he witnessed some nurse sharks mating on a dive.
Again, if you learn anything more from a PM or any other source, I'd appreciate it if you could pass along the info. I am always looking for a beach dive in Northern Palm Beach county aside from blue heron bridge.