Nellie Creek Road has 4 downed trees stretched over a 1/4 mile span about 3 miles up from the 2WD parking, you will need a chainsaw to take them out. There is only room for 1 or 2 vehicles at this point, so some backing may be required if you don't secure one of those spots. Below that, there are some patchy snowbanks along the road after the second set of switchbacks above the lower creek crossing, they have tire ruts through them and should not pose a problem for anyone who was able to drive that far. There is also one really rocky sections that appears to be from a rock slide around the 2.5 mile mark, lower clearance SUVs may hit some of them.
I drove my 2012 Outback to the lower creek crossing (about halfway up the road) before deciding I didn't want to push it, I had to back down the road a short bit to get a parking space. The road walk for the last 2 miles is pleasant enough and goes quick.