I did a run along the fire roads off Hwy 38 to Morton Peak and then on to Crystal Creek Heliport on Saturday. There are a couple of rough spots on the road - if you're going to drive up there you'll need a vehicle with high clearance right now, but if you use your feet you won't have any problems.
Some pictures of that area:
http://kathywing.smugmug.com/gallery/4231324#247494973