You write "This avalanche path originates on the left (north) side of Pole Canyon Basin..." I think you're right, but this can be a bit confusing. The road does not go up Pole Canyon Basin, but continues east and north up the main valley. So while the avy path is on the north (NE) side of PCB, it is actually (as expected) on the south side of the road.
I made the change. Thanks for the input.