There are a few painted white dots on the ground to get you started, but there’s no trail at Bartlett Wash. Once you’re on the rock, it’s a free-for-all. Lean way back, trust in friction, and ride whatever you can. Climb, coast, jump, and swoop yourself silly. Just don’t get in over your head out there. This playground is for big kids; it’s full of increasingly steeper slopes that quickly turn into high cliffs. And the more you ride, the more tempted you’ll be to go bigger.
(Also, try not to skid your tire on the downhills so the next riders can enjoy the scenery as much as you did.)
To get to the trailhead, zero your trip-o-meter as you turn off of Highway 191 to go west on Blue Hills Road (a dirt road at the south boundary of the airport). Turn left at 2.3 miles, veer left at 3.1 miles, and turn right at 3.8 miles. There’s parking and walk-in camping around mile 4.8.
Ride west from the parking lot along the road into the sandy, usually wet, wash for 0.2 miles. Access to the rock is on the right. It's a bit hidden, so look for bike tracks and the typical brown fiberglass pole marking the trail.