Dana couloir was a snow climb when I climbed it on 7-22-17. The couloir is about 40 degrees and only eases off near the top. It is approx. 1,200 feet long. There was snow all the way to the saddle at about 12,200'. Another 800' to summit and you can descend the hikers trail on the west side. Supposed to be one of the best snow/ice climbs in the Sierras. One of the best I've done.
Park at the South end of Tioga Lake. There is a drainage from Dana Lake and Glacier Canyon that flows into the East side of Tioga Lake. Follow this drainage all the way back to Dana Lake and Dana Glacier. The route is obvious. Cross the glacier and climb the couloir.
Crampons and axe early season. I understand this route turns to ice later in the year.