Idaho Maximum Security Institution (IMSI)

IMSI opened in November 1989 to confine Idaho's most disruptive male inmates. It has a capacity of 549 inmates and located within a double perimeter fence reinforced with razor wire and an electronic detection system.  The population is primarily comprised of close custody and administrative segregation inmates. IMSI also operates the state Secure Mental Health Facility, houses inmates under the sentence of death, and inmates who are civil commitments.