Just got back from doing this route last weekend with my buddy kyle. There is only about 50 ft of road that is unpassable but we met someone who went up there on his motorcycle. The trail is in decent shape with only one kinda sketchy creek crossing and then there is a significant section of avy blowdown at around 4500 ft. Here is a link to our trip report on TGR, it was 48 miles rd trip.