The area in question has frequent small sluffs but does not have a reputation to slide big, and there are few terrain traps. Slope angles are 40+ degrees and usually just don't hold large slabs for long. The gentler slope aspects have heavy tree cover, but steep upper slopes and chutes are devoid of trees. The biggest hazard is sudden blind rock and cliff drops, and slides could carry you over them. The hazards are real enough. For comparison, it is 4.4 miles from Waterhouse Peak. Huckelberry Canyon has the same aspects and pitch, is 600 feet lower and drops 2000 vertical in two discinct segments separated by a large flat hanging valley.
FYI, this Saturday is the Echo to Kirkwood Race and Tour. It looks like starting from the top of Sierra and touring due south to Brian Meadows with a nice desent, rather than a 1300 foot climb is 3-miles shorter and all downhill. With a gentle 1000 foot ascent to Little Round Top before decending to Kirkwood, its an much easier route. I doubt I will miss a powder day to do this tour, but I've been meaning to do it some time.
A lot of participants park at Kirkwood, so expect parking to be bad at KW this Saturday http://www.ednsp.org/racetour.htm
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