I floated the lower section of the Gulkana this weekend. The weather was perfect, the water a little low and fishing good.
I ended up breaching on rock, bent my aluminum canoe (SmokerCraft) and put a crack in the side when I straightened it out.
I remember someone mentioning that aluminum, at least aluminum canoes can be welded with minimal equipment. I actually have welded with stick and mig welders so have a big of experience.
Any thoughts much appreciated!