The Horse Shoe Trail runs from a junction along the Appalachian Trail (in St. Anthony's Wilderness) to Valley Forge, PA. From the AT east the whole way to Middle Creek Receation Area is well used and in good shape. Unfortunately the rest of this trail, as it leads to Valley Forge, seems to be disappearing do to development. Hopefully we can get more hikers and equestrians out there keeping the trail open!
Check out this trail's website:
http://www.hstrail.org/