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.