[2] This maximum-security prison has a capacity of 916 adult male inmates with an average daily population of 900.

The 1923 prison was very modern for the time and most things were performed by technology, like the locking and unlocking of doors.

The Maine state prison housed few females, who worked sewing and patching clothing.

Some residents in Thomaston objected to the relocation of the prison out of their town, because it was a part of their history and local economy.

They receive two hours a day exercise in a recreation yard and most services, such as meals and medication, are brought to them in their cells.

The ACU has a level system that is based on behavior and programming and allows the resident to earn privileges.