Sure, not signed why not? It's only a mile or so through there. It does look like it dead-ends at the west end on the top of a hill above the road at a tower.
1) First time if there is any question as to legality go easy. If you do end up somewhere you are not wanted its always better if your are riding/acting courteous (modest speed, little noise & dust), then if OK you can open it up another time.
2) If the route labeled Appalachian Trail which intersects the power-line is non-motorized (national recreation trail?), STAY OFF it!