MikeOtt: The hide was in tree knothole on sawed off branch reached from the causeway. Over time the cache went from film container to tiny bison to finally very tiny centrifuge tube as the tree healed and closed up the knothole. Now even that doesn't work. Also could reach it standing on first rail on causeway, but as tree grew taller you now needed to use 2nd rail of causeway.
It had a good run but can't fight nature, so time to end this one.