Gaiters for snow:
http://www.outdoorresearch.com/en/accessories/gaiters/mens-crocodiles-b76dbcdb50233a9ac2503749fd0037a5.html
And I mean SNOW. Good for postholing in a little more than a foot of snow. The bad part is that they don't breathe well. I wear synthetics under them and am okay. I have worn jeans (an impromptu after-work romp) and the jeans were wet at the end - no surprise there. These gaiters cover my shoes almost completely.
I'm not sure how deep the snow on Roan is - I would guess these would be overkill. But hey, they rock!
If you are carrying snowshoes, gaiters are less of an issue. I find that since the snow is farther away from my foot, less of it gets into my shoes.
My addition to the thread probably didn't help much :P.