I would say that it could be done as a day trip, but you would be rushed. Saturday afternoon i took the water temp and it was 51 and they were still taking dries. I didn't take the temp sunday morning but i would imagine it was anywhere between 45-48. They still took a few dries sunday morning but they definitely seemed to be more focused on subsurface flies more.
I'll definitely remember the devil's staircase for awhile, i don't think i'll run across a trail that was worse than that one for quite some time.