John_Smallberries: This one needs to be retired. As many of you have figured out by now, Hollow Heart referred to a heart-shaped hollow tree stump in this location and the micro was hidden inside. A few years after the hide I noticed that the stump was starting to rot at the edges, and the deterioration kept getting worse. I walked over a few nights ago and it looks like nature has reclaimed Hollow Heart. I can't find any trace of the stump or the micro.
I hope those of you who found it enjoyed the hunt. It was my first cache back in 2006. There are many cache possibilities along the creek so I will try to get another one planted soon.