I believe it's called Pitchess Detention Center. They have a North, South and East Facility off of The Old Road off of the 5 freeway. Then there's the North County Correctional Facility that is in Saugus which is close to Castaic.
There isn't anything special known of the place other than kinda in the middle of nowhere, old lookin' and the only crazy thing I've heard on the news about the place is like any other jail, the blacks and hispanics rioting. A few injured, a few critically hurt and always one who gets the worse beating out of the rest.
Maybe one day they should let them all have at each other, kill a few and maybe we won't have such a huge issue with over populated jails for a while.