Garonne Canyon

You have two options here: Once at the drainage, follow it up a way and once the canyon begins to close ahead, exit and take the spur to the north - lookers left. Here you'll pick up a trail that leads to the hut at the base of Mt. Collin - https://www.alltrails.com/explore/recording/mt-colin-centennial-hut-access--3?u=m. Follow this until it drops into the creek.

Depending on the season you are visiting you will have from 4 to 13 pitches to negotiate. I went in the winter and we only had 4. A friend did 13 in the summer... The canyon might be bolted. We definitely saw one bolt (on a drop that was simply a snow slide for us). We kept dry. If you go in summer, it sounds like there will be wading...