If you decide to go, be sure to have a "plan B" ready. We went up a couple of years ago after the Ranger station rep said it was open. When we got there, the fawking gate was locked <IMG SRC="smilies/pissed.gif" border="0"> We ended cutting across and doing the 'Con that weekend.
I have heard that this has also happened to others in this BB.
Good luck!