John & Everest: Apparently this cache is an island.
A friend checked this out today (thanks, Matt). It appears the cache is gone and was on private property surrounded by the state park. Curious to find out what's so important about this section of land, but that's the way it goes.
Trail Map:
http://www.iowadnr.com/parks/images/maps_pictures/waubonsiemap.pdf
Cache was on the section to the east of trail #6.
John
--
"It's worse than that, he's dead, Jim."