However, here is my video of ascending the route.
And here is Muir's description
At length, I found myself at the foot of a sheer drop in the bed of the avalanche channel, which seemed to bar all further progress. The tried dangers beneath seemed even greater than that of the cliff in front; therefore, after scanning its face again and again, I commenced to scale it, picking my holds with intense caution.
http://www.mtritter.org/mtritter/lucky7/muir.html
So is this class 3? And gear list seems incomplete since a cord to pull up the backpack would have been useful.