Pockets of elk and from what I know, the elk don't move much in there. At least the ones I kept track of didn't. If you're bull hunting, you will need to work harder. If you want to tag a cow in 666, you shouldn't have too much trouble as long as you find an area where they are but that could be the trouble.
It's not like farther south where they seem to be spread out everywhere. I think I would go further south if you don't have a good spot yet in 666/667. Mossyrock isn't that far unless 666 is already a long drive for you, in which case you probably live closer to some decent elk spots.