East Fork of Skeleton Creek is a trail that can be climbed to create a larger loop, or used as an out-and-back. From the bottom of the trail, the first part is fairly mellow climbing with some short steep sections. The later in the season you go, the less likely the trail is to have fallen trees.
The first 6 miles are rideable by most people, with just a few short walking sections. After mile 6, the trail gets much steeper and even the best riders will find themselves pushing there bikes. This is to be expected in the Smoky Mountains since the final parts of the passes are generally steep and rocky. Around the point of difficulty change you'll come to the Narrow Canyon Trail
; a good route to take, that is more gradual to the top. The last 5 miles are much more primitive than the first 6, so stay on your toes. Since this top section is steeper, it is usually done as a downhill but for strong riders it is very doable.
This is an amazing ride in the Idaho backcountry and you'll likely have the trail all to yourself, so ride prepared!