Just wanted to add the (missing) road, don't have any opinions on road types etc. I changed the road type and added some other details; hopefully someone can map this area properly, one day.

There is space for a few cars at the end of this dirt road, and there is a "Discover Pass Required" sign. This site is also listed as a boat launch at https://www.fs.usda.gov/Internet/FSE_DOCUMENTS/stelprdb5162686.pdf and https://www.fs.usda.gov/detail/mbs/landmanagement/resourcemanagement/?cid=stelprdb5162500, though there is no ramp or even space for trailers.

I just made the entire length of the road "unclassified". Hadn't realized that this road was split into several parts when I updated the road ending at the trailhead. Glad that someone is paying attention!

"suitable" = "most passenger cars can make it to the trailhead (with a bit of care)", or "any passenger car can make it"?

Should it be highway=track? But that shows as "unmaintained track road" in iD, which doesn't seem quite right as this road, while a bit rough, is a maintained road...

I'd do some more improvements, if I were able to overlay the map from http://parks.state.wa.us/DocumentCenter/Home/View/1938 in the iD editor...