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 ridden up, the trail climbs 2000' over 29 switchbacks - expect to be in the granny gear for awhile. A few of the switchbacks are a little washed out, but none are too tight to ride.