See Approach described in Mountain Overview section on the Main Page.
From the headwall of the saddle between Thompson and Williamson head to the left side closest to Thomson. Here you will find a breach in the wall that will allow you to scramble up to the saddle with little difficulty. From the saddle traverse up and around the west side of peak onto class 2 scree and talus. As you climb the west side of Thompson peak you will see a split between the two main towers to the left of the south couloir. Just after entering the gully area, climb the wall on the right side of the couloir. The wall will go from class 3/4 to about 5.2 depending on the exact line you take. There are no bolts or man made protection of any kind. The technical part is probably no more than about 30-40 ft. The total distance round trip from the trailhead is roughly 13-14 miles.
helmet, rope, and light alpine rack. Depending on your ability, you may do it without gear. Also depending on snow conditions, and time of year, you may want to drag along ice axe and crampons.
If you have information about this route that doesn't pertain to any of the other sections, please add it here.