Idaho Maximum Security Institution (IMSI)

View of IMSI from the front drive
IMSI entrance
Mailing Address:
PO Box 51
Boise, ID 83707
Physical Address:
13400 S. Pleasant Valley Rd
Kuna, ID 83634

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. 

Warden: Keith Yordy, IMSI email address:; Phone: 208-338-1635


Visiting schedules are subject to change based on emergency situations.

Please read and be familiar with the Visiting Rules for Offenders and Visitors and complete the visiting application process before visiting the facility. 

Note: The use of tobacco products on IDOC property is not allowed, to include parking areas. No tobacco can be brought into any facility. All tobacco products must be stored in a locked vehicle.

Visiting Schedule for IMSI

Print this pagePrint this page