Trail Crest Tower, South Face, and Aiguille Extra, East Face. Trail Crest Tower is the first prominent tower south of Mount Muir. The route is just left of the southeast comer of the tower. It stays about ten feet left of this outside comer for its entire length. This three-pitch climb was done by Pete Mack and me in July. The crux was the middle pitch (II,5.9). In August, Kenn Kenaga and I made what we believe is the first free ascent of the original Sumner-Heath route on Aiguille Extra. We found 5.10 sections on the first, seventh and eleventh (Last) pitches (IV, 5.10a).