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The Roach guide mentions two gulleys to take up the western side. The depicted route went up the leftmost black gulley with loose fridge and car sized boulder maneuvering. A key observation is that the more stable rock had lots of lichen on it, from years of stability. The loose rock was all uniform light grey colored and could be nasty in places. STay on the larger lichen encrusted rock.
The best way up and down from lake Siberia is actualy the furthest ridge west which you have easy access to from Lake Siberia. The Roach routes are from Geneva Lake. It involves more actual climbing but is much more solid.
Fantastic views and exposure on the other side and surely a more direct route to Lake Siberia. If you take the center gullies be advised there is lots of loose rock and a helmet would be a good idea.
The route less taken for sure up Snowmass. Would be epic in the winter.
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