“A fire road from the town of Clayton to the Black Diamond Mines Preserve.
— Bob Gardner
The old Black Diamond Way road that connected the town of Clayton with the mining area of Nortonville and Pittsburg is now part of a regional trail system. This section is a steady climb up a canyon to a ridge top at the boundary of the Black Diamond Mines Regional Preserve. It's a smooth fire road that gets steeper as it approaches the ridge top, then joins the Cumberland Trail inside the preserve. The trail can be done as a short out-and-back or it can be used as an alternate starting point for the Nortonville & Black Diamond Trail Loop