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.
"After the first glass, you see things as you wish they were. After the second, you see things as they are not. Finally, you see things as they really are, which is the most horrible thing in the world."
--Oscar Wilde on Absinthe