A report into HMP Nottingham after an unannounced visit has found that there are significant concerns, that it was not safe enough and conditions were poor.
The Chief Inspector of Prisons, Nick Hardwick, said that the prison was bleak and there were high levels of violence.
The report said that almost 40% of prisoners reported victimisation by other prisoners.
The inspector did say that vulnerable prisoners were being kept safe at the prison and that work to reduce drug supply seemed to be making a difference.