Just wanted to update that it was the same as described before. Went up with Forester. This photo I've included is representative of some water bars on the road beyond the typical stopping point. A truck did get up higher, but I couldn't tell make/model.

Didn't drive this section at all but have hiked it a few times, including recently. A capable high clearance 4x4 could make it but would involve quite a bit of effort. We decided just to leave our Xterra Pro4x at the trailhead and walk it. Some recent evidence of alder clearing in the first few hundred m but someone must have stopped. No major turnaround areas until you get to around 2000m just before the pass opens up.

As others reported, heavy pinstriping and at least one challenging washout section requiring high clearance 4x4. Passable in a stock Jeep Wrangler. Almost no pullouts so hopefully you don't meet anyone going the other way.

The lower section is extremely grown in and you are all but certain to get pin striping here. There are only a handful of spots where you can pull over/park until you reach the clearing at ~1970m of elevation. There is one crux section that I found quite challenging in a Tacoma and had to resort to locking my diffs to get through it. After that is another narrow off-camber section but you can drive slow. Overall, not super worth it to drive in my opinion as it's not a far walk from the normal trail head. After the road opens up again, the condition improves drastically and one could easily drive all the way to the pass.