Wharton is not a WMA it is a state park. I still say the established roadway could have been fought. There is not one single dedicated map out there of established roadways.
WMA's are regulated by the Div of Fish and Game, not the Div of Parks. They have separate conservation officers, not park police, who are much more aggressive and successful in policing their properties and blocking their trails.
Its a wonder that the Div of Parks does not ask for their help and experience with this issue