Sawyer River Rd. is a snomo trail, so I doubt you'll have any problems there.
Maybe...but also maybe not. It was packed out by snow machines when Greg and I did it. But I do remember occasionally in the past where people have found no snowmobiles had been out there since any given snowfall and people had to break it. I think that is the rare occasion, but just be aware. Of course since it has been a couple weeks since any heavy snowfall I would not worry about that.