Just EAST of GZ there is a path that leads to the shoreline. Once at the shore line it will take some careful walking, stumbling to get to GZ. GZ is also accessible via a bit of a steep descent to the shore line from the grassy area. The cache is high enough to stay dry even during high water season. BUT it might take some wading if you take the path to the shoreline and then head west. It MIGHT be accessible during the winter. You might have to dig thru the snow of course, and then hopefully it is not frozen in place. Either way, good luck! Please be sure to replace as found.
For those of you that have been finding my Spice Bottle series, this one is NOT in a tree, sorta, LOL :-)