The best legal singletrack in Contra Costa County.”
— Mike Anciaux
You really are out in the middle of nowhere. Bring enough water, first aid and repair equipment to handle anything. Also, the trail can be quite rutted some years.
This is a challenging singletrack, especially considering how much work it is to get there. But it's totally worth the effort!
The first 2/3 of the trail is mostly climbing on the side of a steep hill that parallels a creek. It's curvy, narrow and exposed.
The last 1/3 if continuous flowy downhill. Again, it is narrow, curvy and exposed as it traverses steeply down into Jackass Canyon.
The trail ends at Finley Rd. To return on paved roads, turn right on Finley Rd. It starts as dirt but turns paved at the park entrance. Continue down Finley Rd to Camino Tassaraja Rd.