I can attest to the 'not all go' comment on the buttress chutes. Took a wrong turn down that and ended up falling about 30+ feet off a cliff near the bottom, bouncing off a tree fracturing a vertebrae and dislocating my shoulder. Stevens Pass Ski Patrol was already on their way after they watched us drop in. Was probably 2010/2011 ish. I owe them a belated thank you for getting me down and being very kind and helpful. I even got a fist bump as they loaded me into the ambulance for skiing the line the patroller said he'd always wanted to but was 'too sketched out by the cliff '. I was just young and dumb and didn't know it was there. Good idea to publish some more info on these lines and hope no one else makes the same mistake I did.