I’ve read that the first ascent of Milestone Mountain was to ascend to the Southwest Ridge from Milestone Bowl, but I can’t find anything on doing the entire traverse from Centennial Peak. Has anybody done it? Does anybody even have an opinion on how difficult, time-consuming, or unpleasant it might be? We’ll be in the area this August, and I want to know whether we should even consider this traverse. Thanks!

Looks really hard. This is Centennial from the east. The ridgeline you covet is on the right. And then there's the portion going up to Milestone, unfortunately I don't have a good photo of that.

I think this picture shows the last bit of the ridge (Lake 3512 and Whaleback in background), from near the summit of Milestone on the Norman Clyde route. Does not look too bad, but I don't have a picture of Bob's portion of the ridge from above; the west side could be easier.

https://photos.app.goo.gl/WdFSf4Z7AtC36L619

Correction - here is the whole thing:

https://photos.app.goo.gl/q36Du7K9YCqbFxJ48

Old picture - but I believe this is from the summit (or very near the summit) of Centennial looking toward Milestone:

https://photos.app.goo.gl/N9XrJtxcou9jRa3g7

Thank you, Bob, Romain, and Chris. Those photos add up to a big help. This Map https://caltopo.com/map.html#ll=36.63123,-118.48897&z=16&b=t&o=f16a%2Cr&n=1,0.25&a=sf seems to show that it’s not too bad except for about 200’ of climbing out of the notch. I would love to see a photo from the west.

We’ll probably study it on the way in, really study what looks like the 200’ crux from the summit of Centennial, and then descend with our tails between our legs.