The purpose of Oakhill Correctional Institution (OCI) is to maintain the safe and secure custody of minimum security offenders in a responsive, supportive, equitable and quality environment. The primary emphasis is to prepare offenders for release into the community by providing education, treatment programs, work release opportunities and pre-release programming.
OCI was originally opened as the Wisconsin School for Girls in June 1941. It is listed as a historical site in the State Historical Society Register. OCI also operates the Security Unit at UW Hospitals and Clinics. This is a maximum security 10 bed in-patient unit, where inmates for all Wisconsin correctional facilities are sent for specialized medical care.