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It's best to hike up this line so you can check the snow conditions and really there isn't a better way.
Park at the S curve 4.3 miles up Big Cottonwood Canyon.
Hike up the Mill B trail to Lake Blanche.
From the lakes head up the E branch of the upper canyon.
Keep going into the uppermost cirque and you'll see the Diving Board to the lookers left of Rampage. The top of the line isn't that steep, but it slowly rolls over and steepens just as you hit the crux where you cut back skiers right and onto the angling ramp.
The crux can be in the upper 50's and a fall here would be fatal so make sure the snow is good, or downclimb if it's not.
The ramp flattens out quite a bit, but there is still huge exposure and the snow usually has some fun wavy wind features.