NF-1250 where they were stuck is indeed a section Summit Rd. That said, something tells me they probably weren't aired down, and probably didn't have a half dozen vehicles with winches with them...
I'll be the optimist and say I think we'll be fine through the Ochocos =p
I found where NF-1250 and NF-38 come together. Good news is that they made it a long ways up there from Paulina before getting stuck. So if all else fails we can drop south a little and keep heading East.