THINK OF GRANNY'S HOUSE as a two-headed monster of a trail. The tail is on the north end, where it forks off Arsenio, and the two heads are on the south end where the trail meets the Arsenio Loop Rd.
One of these "heads" is right across from the bottom of Oly, and the other is right across from the top of Purple Heart. So the Granny's House / 187 is also a very useful trail too, since it completes the single track connection between the Towers and Arsenio.
There is some indication that the 187 fork may have been the original terminus of the Log Cabin Trail, since an old alternative name for 187 is Old Rick's Trail, after Old Rick, who purportedly built the log cabin. But the 187 fork was lost to logging activity right after the turn of the century, and only reclaimed through the work of volunteers like Jim Fricker and David Waugh in early 2005.
RIDING Granny's House and 187 either way is a real pleasure, if you like sweet single track that snakes across an undulating ridge in the woods. There are some stunts along the side of the trail, but this is not a stunt fest. It's Galbraith trail riding, with a typical assortment of roots, rocks, switchbacks and slash thrown in to spice it up. Dig it!