Trail Overview
Alpina is a directional, double black diamond descent from south to north, dropping nearly 600 feet over 0.8 miles. The trail begins with a steep ride down a forested spine, followed by narrow side-hilling with log hazards and constant exposure. The main obstacle is a large off-camber rock face with a vertical crack, which is followed by more ledges and root drop-offs, all within a very tight corridor. Several switchbacks are extremely steep and difficult to navigate cleanly. This is one of the farthest out trails from the Diamond Mill staging area. While out this far, you might as well stop at Triangulation Point for 360-degree views of the whole mountain range, and then make this a loop with trail 130.
Difficulty
This is an extreme trail due to rock-face features, technical drop-offs, extreme exposure, and tight, high-risk switchbacks.