Look for edges, borders, corners, benches, ect. Something that seperates two areas or terrain. I have found most sign between alder thickets and old growth pines and between old growth and jack firs, especially if there is a bench in there. Look at where these type of areas border clearcuts, and get in a little ways. If lucky, you might find a staging area like this, where they come to before dark in preps to come into the clearcuts to feed. Keep this in mind...BT are spooky, and nearly always have a "back door" where they travel. Good luck!