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.
The E Face of Twin Peaks is not one of the longest lines, but it's consistently steep and can be very fun in the right conditions.
This line is easily scouted on the approach which is nice.
Start at the Broads Fork trailhead in Big Cottonwood Canyon, head up the main drainage to the saddle to the S of Twin Peaks and then traverse the ridge to the summit.
This line starts off of the E summit of Broads Fork Twin Peaks.
The upper section is littered with very sharp rocks and often holds loose and rotten snow.
When coverage is good you can drop right in from the summit.
If coverage isn't great you can work down to the skiers left or right and skirt in to avoid some of the rocky upper section.
The top few turns off the summit are the steepest nearing 50 degrees, but only for a few turns.
The slope then mellows out to a nice 40 degrees.
Trend to skiers right and you'll line yourself up for the nice chute in the middle section.
This narrows into a choke that is a few hundred centimeters wide and then opens up into a great apron to finish it off.