Blackjack Mtn Ridgeline from Black Mtn Ruins 4515; The 4x4 route on unsigned FR986 runs south to north at the lower ridgeline base for 2.9mls ending at Upper Hess Canyon drainage at 3560ft; There are 4-5 summits along this Blackjack Mtns Ridgeline; Yankee Joe Canyon to the Salt River parallels the far side of this Blackjack Mtns Ridgeline;