[Chriffer]

Glad you had fun out there. I'll post up the map link that I updated a week or two ago, so we are on the same page when I explain things. Now that I think about it, going up NFS isn't as obvious as it is going down. It's certainly not the popular direction to do it. That downhill/jump line you saw I'm not quite sure on it's condition (so it's not on the map). It was decommissioned at some point last year, so may not really exist. NFS is meant for going down, but is possible to go up as well. It has no real jumps or drops on it.

Getting from 5858 to NFS you follow the Flume (Reservoir outlet) using it's access "road." It follows the concrete waterway to a pond area, and goes right and there is a rock lined section, and a couple go arounds that are fairly obvious. I'd call most of this smooth doubletrack. Eventually there will be a trail that goes off to the right and fairly sharply uphill. It hooks left after it gets about 30 feet up and runs generally sidehill for a little while. Then climbs up to where NFS meets TTS and Plan B on the map. When you run out of single track, going straight will take you on an old very degraded logging road for a short time, and the single track cuts left off of this again. This should take you all the way up to the parks highest point at the water tower.

I'm guessing you went up the first section of NFS, but then didn't go straight onto Plan B to connect to the upper half. I can't figure out how you found down trees you couldn't pass. The start of NFS from the water tower near the T-Rexs is your best bet to see how it really is. This thread has a good recent video of NFS from the top. I don't think it has quite all the bottom end of it though.