The Riverbend Maximum Security Institution (RMSI) is a prison in Nashville, Tennessee, United States, operated by the Tennessee Department of Correction. The prison opened in 1989 and replaced its 100-year-old neighbor, the Tennessee State Penitentiary. RMSI, which is made up by 20 different buildings, sits on 132 acres (0.53 km2) located off Cockrill Bend Boulevard in Nashville. Riverbend's designated capacity is 786 offenders. Of that number, 480 are classified as high risk.