Porcupine Creek Trail is excellent singletrack along its entire length.
This trail can be used to loop Warm Springs Ridge and Warm Springs Creek Trails.
The lower section from Warm Springs Creek Trail is gravelly at times and accesses Twogood Cabin.
If done west to east, the trail climbs 2000' over 29 switchbacks. A few of the switchbacks are a little washed out, but nothing to worry about, just watch your footing.