Naches is fine for that trail. But after that the Manastash Ridge (as a generic name) about covers everything else up that way. Rimrock works (as a generic name). Liberty too. But what about Van Epps, Gallagher, Clover Springs, Glass creek, and the whole slew of others not covered by a generic name. I think perhaps covering an area by the FS or DNR district is a somewhat better way. Still there would be problems.
I use the Wash Dot Mountain Pass website for info. They have a map that list the pass's. http://www.wsdot.wa.gov/traffic/passes/
Click on the pass you desire and it links you to info about that pass. Perhaps someone knows how to set up such a feature for here. You get info and access threads about areas just by clicking on the maplink you desire.