When I was in high school I used to spend a bunch of time up there. Used to take the western Elma exit and head out across the river and up into the hills. Sounds like it would be the entrance you are looking for. I think the Weyerhaeuser Twin Harbors North tree farm map would cover the area, though I don't have it handy right now to check.
I never had a hard time finding does. Bucks were a bit tougher to come by, as in most units, but you shouldn't have any trouble filling those tags. It should be fun!