Analysing terrain data
The exposure grade does not take into account objective hazards (stone fall, seracs, etc) but only the consequences of 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): Certain death in the case of a fall.
A steep couloir that narrows at its center, Threeway Chute #4 starts steep and wide at the top.
It narrows in the middle, and during low snow conditions, this pinch point can feel quite narrow, though it is still wide enough to make turns.
This couloir is bordered on skier's right by a long buttress.
It is possible to ski onto this buttress in the middle and traverse under Billy's Chute.
This halfway point also offers a great spot to stop for a break.
Stay in the main chute and ski into the wider basin below the three other chutes.