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...

Make your way back along the Overlander trail, or canoe back across the river.