ISP jointly occupies with Chuckawalla Valley State Prison (CVSP) approximately 1,700 acres of State-owned property, of which ISP encompasses approximately 640 acres. The prison complex occupies an estimated 350 acres with the remaining acreage used for erosion control, drainage ditches, and catch basins.
ISP was activated February 1, 1994. ISP has four semi-autonomous Level III facilities and an outside Level I facility. Each of the facilities contains five 270 designed housing units with a 100 designed bed capacity. Facilities A and B have been converted to house inmates with Sensitive Needs (SNY). One of the Level III 270 designed housing units in Facility A also has been converted to house the Administrative Segregation Unit. The Level I facility has two 100-bed housing units. The institution does not have a firehouse; fire protection is provided by shared services with CVSP.
ISP’s designed capacity is approximately 2,200 inmates. Currently there are 3,280 inmates housed at ISP.