I just saw this post.  You might already have the answer, but thre is no trail to the PCT from the Whitechuck road anymore.  Massive washouts, one after the other - and tons of old growth across what little trail is left. 
  
Not worth taking a bike down the road, at least it wasn't for me last summer (Fire Mtn HR trip).  Lots of trees on the road,  too,  but mostly smaller logs - alder and maple. Except for that huge, huge, huge cedar near the end of the road - it finally gave up the ghost and is laying across the road.  You can walk under it though.   
  
You'd have to carry the bike around the first 3 massive washouts - not too bad, but a hassle.  The rest - I chose to walk it rather than ride (tried riding earlier last summer, but too much of a hassle) 
  
If ATV's got back there in the last couple of months (in via Prairie Mt back roads to Rat Trap and down), they may have cleaned up the road a bit for biking.   
  
But like I said, there's no trail left.  Gone.  Vamoose.  Nada, zip. OK, I take back the zip.  There is some tread here and there. Impressive washout just after Fire Creek - a joy to get around.  Funny - that Fire Creek bridge survived, but beyond - looks like armaggeddon.