BETA PHOTO: Southwest Couloir from the South Teton (8/94).
Description
This is the standard route on the Middle Teton. From the Meadows, head up the south fork of Garnet Canyon. Going up this fork is more time consuming than the north fork due to a lack of a (decent) trail. Climb all the way to the saddle between the Middle and South Tetons (do not branch off right early).
The couloir should now be obvious on the left (west) side of the ridge leading to the summit. If snow-filled, ice axe and crampons will be needed. It seems, however, that this couloir melts out relatively rapidly. I remember it becomes quite narrow towards the top, and is a bowling alley if anyone is above you. Helmets recommended! The couloir tops out very near the summit.