> Is it possible to do it on a snowboard, or would you end up walking for a lot of it?
If you choose to go by snowboard, it is very important that you always keep the snowboard on your feet, no matter what (and same goes for skis). I went with a very good snowboarder down various Vallee Blanche routes often, but he always brought a ski pole for this purpose. You basically need to be roped together the minute you take off your skis/board, as this greatly increases crevass fall potential (dramatically less surface area and more pressure on the snow bridges.
> (In reply to Gouldie) I did it 2n dweek in march ... The day before a boarder who thought he knew best went off-route and died falling into a crevase.
That would probably be this unfortunate fellow:
http://www.ukclimbing.com/forums/t.php?t=122543
He took his snowboard off to walk a flat bit and promptly fell into a hidden crevass.
> The real danger is the 'objective' danger and in the main this means crevasses. I doubt anyone would be up there if there was a high avalanch risk and do keep an eye on the weather as it could be pretty nasty if a storm comes in.
I've been trying to work out myself the real deal on crevass danger when skiing. As near as I can figure, your biggest dangers with crevasses are: 1) walking instead of skiing/boarding and breaking through something totally unseen 2) skiing over areas that are obviously covered crevasses with potential to break (best to ski around them) 3) getting yourself commited into a zone mentioned in point 2 by bad routefinding, and forced to ski through it due to inability/unwilling to hike back up. 4) skiing out of control, falling, getting caught by an avalanche, or otherwise skiing staight into a gaping hole or over an obvious weak bridge.
If you are very mindful of routefinding (basically avoid anything that looks crevass-like), very mindful of avalanche danger and exposure on a micro-level, and ski well in control, there is very little objective danger IMO... but if somebody could back this up with some more authoritative information please do so!
In reply to Gouldie: I would say then go for it and good for you! But you should probably take a guide, as from what you wrote I would say your skiing ability is not really high enough to go on your own... having a guide along with mitigate the risk. In an extreme case, if you really have a lot of trouble he could put you on a short-rope during the exposed parts, for example.