That chunk of rock caught my eye a few years ago. I did a little research back then and found that the approach was on private logging land (can't remember if it was Stimson of Weyer) so I left it be.
There are a number of TR's on OregonHikers.org from folks hiking up that way in recent years and at cursory glance there is nothing about "No Trespassing" signs.
shapp, I would be curious to check it out if you get the go. I have been told the view is quite nice.