Paul, you may already know this since you linked to the wilderness.net map but I believe that you can find fairly reliable acreage totals for the Pasayten here:
think I saw at least 2 TR's from that area (Cathedral Peak region) on cc.com this season! In fashion eh? (maby 'cause N. Cascades seemed wetter this season).
Get yourself over there before it's too late this year. Or are you wanted in Canada?
"Or are you wanted in Canada?"
wish we could - out of vacation time & can't pull it in a weekend (even from Canada I think it's too long)...hopefully next year. Amazing area - looks like the Wind Rivers a bit I think.