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I usually get to this one from the 4th of July Trailhead by Buckingham Campground. From there you need to go to Upper Diamond Lake by following the Diamond Lake Trail. It's a bushwack above treeline to where the routes start.
This picture was taken in late Oct, after an unusually warm Fall. I recently (mid July, 2011) climbed Jasper Peak again, and took new pictures as it was in excellent condition. Those are available here.