This route starts from the Hannegan Pass Trailhead. From the trailhead, hike four easy uphill miles up Ruth Creek Valley through open avalanche terrain on good trail to Hannegan Pass gaining about 1900ft. Then follow the trail straight over the pass and down into the Chilliwack Valley losing about 2400ft. Once at Copper Creek Camp in the bottom of the valley, hike about two mostly flat miles to where you can first actually see the Chilliwack River about five miles from Hannegan. Somewhere around here, an obvious though unsigned trail departs to the right and leads down to the river. One must ford the river (ankle deep in late season, no easy task early). Pick up the abandoned Easy Ridge Trail directly on the other side. For about half a mile, the trail is very brushy with annoying blowdown. After that though, things improve somewhat, although brush and blowdown are present all the way up. Climb up the trail to a saddle in Easy Ridge 2500ft. and three miles up. Camping here, ponds for water.
From here, a climber's trail departs right up the ridge. It is fairly easy to follow until right before Easy Peak. A class two scramble with cairnes leads to the top of this peak. From here, follow the ridge across point 6553 and to the notch on its far side. From here, descend diagonally south mostly on talus (no climber's trail anymore) aiming for the bottom of a prominent buttress descending from Whatcom Peak. Cross underneath this at about 5200ft. and immediately come to the Imperfect Impass, a hellish gully/canyon. One possible crossing is to ascend about 150ft. and cross up there. That's what we tried and we got very scetched on cold, slabby, loose rock with terrifying exposure. I'm not sure what this is rated but it feels hard. If one really tried, they might be able to set up a belay here but we were freaked out and turned around.
Supposedly, there is a better crossing, about 1000 feet further down. Please anyone who has found a workable way across this thing leave an addition. It will be greatly appreciated.
From the opposite side of the Imperfect Impass, scramble back up 1000 feet to Perfect Pass at the edge of Challeger Glacier. Camping here.
From Perfect Pass, make a rising traverse across the relatively gentle Challenger Glacier avoiding crevasses to the northeast ridge (on snow). Ascend up this to the rock (possible bergschrund). A short pitch to 5.7 on reasonably good rock completes the climb. This pitch has some fixed pins and/or bolts.
GOOD RAIN GEAR!! crampons, ice axe, glacier equipment, very small rack (maybe four pieces), a few slings for rappels. A helmet is suggested but not really required (use your judgement).
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