Trail highlights:

Nice climb up to the top (beginners might want to shuttle - FS 45 up to FS 221, turn right and park where Quartz Loop starts).

Great downhills: back half of Quartz if done clockwise, last stretch of Bypass down to the road, first part of River View if done clockwise, right leg of Bear Paw, and last but no way least Thunder Rock Express.

Contour cruising: Chestnut Mountain singletrack, 12-18" wide through the dark hemlock and white pine forest. River View and Quartz, where you can hammer in the big ring if you are so inclined.

Bring spare tubes I got 2 flats the first day. Thanks to our trail angel and saturday guide Don Fox I made it out without walking. I had air and tube for only one flat. He carries two tubes all the time and rides there often.

West Fork climbs on up until you hit The Chestnut Mtn Loop. Go right. Watch for the Quartz Loop on the left right by where the trail hits another FS road (221?). This is a spur that takes you out to a loop. Stay left. You will pass two other trails. The second trail is where you will return to the spur after completing the loop. When you complete the loop, go left and make your first left. This will take you up and back down (fast!) until you hit a closed FS road that is slowly reverting to single track. Go right here and look for the River View Loop on your left. Follow it a ways and it eventually hits the same closed FS Road. Go right, Pass Chestnut Mtn and take the next left onto Bear Paw loop. As you complete the loop, you can either go straight ahead and start climbing or make a hard left and ride down to the Whitewater Center. Stay straight. Pass The Bear Paw turn off, and look for a left onto Chestnut Mtn. Follow this a couple of miles looking for T R EXP (this is how the sign is marked for the Thunder Rock Express trail. When you hit the bottom, you are basically back at Thunder Rock.