As of March 2014 the Clear Creek Management Area is open to the public but access to the the central area, the Serpentine ACEC, where San Benito Mountain is, is through a locked gate.
The road from Clear Creek (form the Hollister/Coalinga Road on the west side) is quite good now, though with a couple of stream crossings on concrete fords.
You have to get permits online (one for your car, one for each person). Then you have to telephone the BLM office in Hollister for the gate key combination
details at BLM site
and to buy permits at recreation,gov ::
Awesome news David, thanks for posting. A permit system for this area is a really good idea, IMO, the CC Mangmt Area had been "closed" for far too long. I will update the page once I get a few minutes.