Built: Started construction in 1999, completed in 2001.

Cost: $140 million

Capacity: 1,600 maximum-security inmates, 200 minimum-security inmates.

Size: 15 buildings totaling 625,000 square feet, sitting on 146 acres of land just north of Thomson, Ill.

Security features: One-mile loop of two parallel fences, 25 feet apart. Interior fence is a 15-foot-high, dual-sided electric stun fence that carries a 7,000-volt current. Exterior fence is 12 feet high, stacked top to bottom with razor wire. A network of 305 digital surveillance cameras is in operation. Federal officials have said new security measures would be added if the federal government buys the prison.

Source: Illinois Department of  Corrections