Lum is a useful connector trail similar to Beech Grove in that it can be used to complete loops on Iron Mountain. It can also be used as a way to ride in/ride out from the Beartree Campground.
It is a wide trail for the most part, following an old road bed and part of the straight branch watershed. The trail intersects with Iron Mountain at the gap between Straight Mountain and Grosses Mountain, two significant ridges that Iron Mountain follows.
Trail conditions are moderately rocky in some spots and also have some short wet areas. There is a nice place to rest near the top of the climb at the Straight Branch Shelter, a remnant from when Iron Mountain was actually the Appalachian Trail.