Analysing terrain data
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The exposure grade does not take into account objective hazards (stone fall, seracs, etc) but only the consequences of the skier falling.
Low Exposure (E1): Exposure is limited to that of the slope itself. Getting hurt is still likely if the slope is steep and/or the snow is hard.
Medium Exposure (E2): As well as the slope itself, there are some obstacles (such as rock outcrops) which could aggravate injury.
High Exposure (E3): In case of a fall, death is highly likely.
Extreme Exposure (E4): In case of a fall, the skier faces certain death.
To approach, park at the S curves in Big Cottonwood canyon and follow the creek up to the Mill B trailhead.
Follow the summer trail up into the drainage until you reach the lakes.
Cross over the lakes and head to the SW branch of the upper canyon.
Work your way through the rolling hills and benches until you see the gully itself, then climb up it.
From the Little Cottonwood Canyon Ridgeline this steep chute runs down off the ridge for almost one thousand feet before it drops through some playful rolling terrain in the lovely upper basin of Mill B.
There's still plenty of skiing to be done as you wind your way through the aspen trees and finally end up skiing back down the approach route.
A long tour, but worth the effort with the beautiful views and huge amount of skiable vertical.
You might even run into the ever ornery Bob Athey.