As I mentioned in my previous report from Rattler Benchmark, my Dad and I followed that activation with a trip up to Cleman Mountain. If you are coming down Game Department Rd from Rattler, you need to drive south back towards town for a while on N Wenas Rd until you reach the entrance.
Unfortunately, the map shows many roads leading up the mountain but we were only able to find one that was passable at (46.833565, -120.711814). The signs at the gate read "Closed from Dec 9th thru May 15th."