Maximum Security Prisons in Colorado: ADMAX, Step-Down, and Reforms

Maximum security prisons in Colorado operate at two levels: the Colorado Department of Corrections runs six state facilities designated Level V, its highest security classification, and the federal Bureau of Prisons operates USP Florence ADMAX outside Cañon City, widely considered the most secure prison in the country. Which facility an inmate lands in depends on whether they were convicted of a state or federal offense, the results of a classification process, and in some cases their behavior inside the system itself.

The Six State Level V Facilities

Colorado law sets five security tiers, I through V. Level V is the top tier and can house inmates at any classification. These facilities require double perimeter fencing with razor wire and detection devices, controlled entry points, and continuous perimeter patrols.¹

Colorado State Penitentiary (CSP), in Fremont County near Cañon City, is the flagship maximum-security prison and primarily houses inmates in administrative segregation.
Centennial Correctional Facility (CCF), also in Fremont County, serves a dual role. Its north side holds a Residential Treatment Program for inmates with serious mental illness drawn from all custody levels, while its south side houses inmates in restrictive housing.²
Denver Reception and Diagnostic Center, in Denver, processes new admissions and assigns initial classifications.
San Carlos Correctional Facility, in Pueblo County, focuses on inmates with specialized needs.
Sterling Correctional Facility, in Logan County.
Denver Women’s Correctional Facility, in Denver, is the state’s maximum-security facility for women.¹

CSP draws the most attention because its design centers almost entirely on single-cell housing meant to keep inmates separated from each other. Each living unit features individual cells with control booths that let correctional officers monitor multiple wings at once. Staff manage inmates who have shown extreme aggression or repeatedly destabilized lower-security facilities. Movement outside a cell requires multiple officers and full restraints.

USP Florence ADMAX

The federal government operates its own maximum-security complex just outside Florence, Colorado. The Federal Correctional Complex at Florence includes three separate facilities: USP Florence ADMAX, USP Florence High, and FCI Florence.³ ADMAX sits at the top of the federal system’s security hierarchy and houses roughly 335 inmates convicted of federal crimes.

The physical design leaves nothing to chance. Cells are built almost entirely from poured concrete, including the bed, desk, and stool, which prevents inmates from breaking apart furniture to fashion weapons. Windows are narrow and angled toward the sky so that occupants cannot orient themselves to the surrounding landscape or communicate visually with anyone outside. Electronic monitoring and multiple perimeter barriers supplement the structural containment.

Inmates sent here tend to fall into a few categories: those convicted of terrorism, espionage, or large-scale organized crime; leaders of violent prison gangs who continued directing operations from inside other facilities; and inmates who proved they could not be safely held anywhere else, whether through escape attempts or extreme violence against staff. The population has included cartel leaders, domestic and international terrorists, and serial offenders whose crimes generated national security concerns.

Federal law gives the Bureau of Prisons broad authority to designate where a prisoner serves their sentence. Under 18 U.S.C. § 3621(b), the Bureau considers the nature of the offense, the inmate’s history and characteristics, available facility resources, and any recommendations from the sentencing court.⁴

How Inmates Are Classified and Placed

State Classification

Colorado’s classification process begins at intake. Staff evaluate criminal history, educational and employment background, offense severity, sentence length, and behavior during time in county jail. Those factors generate a custody score that determines initial facility assignment under Administrative Regulation 600-01.⁵ Inmates who score at the highest levels get placed in Level V facilities.

Gang affiliation, prior escape attempts, and a history of assaults on staff or other inmates all push the score upward. What matters is not just the original crime but how the person has behaved inside. An inmate serving a relatively short sentence can still end up in maximum security if their conduct behind bars warrants it.

Federal Classification

The Bureau of Prisons uses its own Security Designation and Custody Classification Manual to assign inmates. An inmate’s first custody classification is scored at the first program review, roughly seven months after arrival. Custody reviews then happen at least every 12 months, though they can be conducted earlier to facilitate progress toward less restrictive housing.⁶

Federal regulations also require a general program review at least once every 180 days. When an inmate is within twelve months of their projected release date, that frequency increases to every 90 days.⁷ Inmates must be notified at least 48 hours before a scheduled classification appearance and are expected to attend. Refusals are documented.

Daily Life Inside

The routine is deliberately monotonous. Inmates in the most restrictive housing at both state and federal maximum-security prisons typically spend 23 hours per day locked in their cells. The remaining hour is spent alone in a concrete exercise area that provides fresh air but maintains total physical separation from other inmates. Movement outside the cell always involves two or more officers and full restraints.

Meals arrive at the cell rather than in a communal dining hall. Food is prepared in a central kitchen, portioned onto trays, and delivered to each housing unit in insulated or heated carts. Inmates eat alone.

Social interaction is limited to brief exchanges with staff or professional visitors, usually through barriers or electronic intercoms. At ADMAX, many of those interactions happen through a slot in the cell door. The sensory environment is defined by artificial lighting and the mechanical sounds of automated doors. Every aspect of the day follows a rigid schedule that minimizes the chance of coordinated disruption.

Step-Down Programs and Reclassification

Maximum security is not necessarily permanent. Both the state and federal systems have built structured programs that let inmates earn their way to less restrictive housing. These programs are the primary mechanism for getting out of solitary-style confinement.

Colorado’s State Step-Down Process

The Colorado Department of Corrections uses a progressive step-down process to transition inmates out of maximum-security restrictive housing. The first stage is a Close Custody Management Control Unit, operated at both CSP and Sterling. Inmates in these units are allowed out of their cells for a minimum of four hours per day, seven days per week, with up to seven other inmates. Activities include group recreation, programming, and structured social interaction. Mental health and case management staff review each inmate’s progress every 30 days.⁸

The next stage is the Close Custody Transition Unit at CSP, which runs for roughly six months. Here, inmates spend at least six hours per day outside their cells with up to 16 other inmates. The program includes “Thinking for a Change,” a cognitive behavioral curriculum designed to address criminal thinking patterns, improve peer interactions, and develop problem-solving skills. Successful completion prepares inmates for transfer to general population or community reentry.⁸

Federal Step-Down at ADMAX

USP Florence ADMAX runs its own step-down program with four phases: General Population Units, then Intermediate, Transitional, and Pre-Transfer Units. As inmates advance, they move to less restrictive housing and gain greater privileges. The standard timeline for completing the full program is about 36 months, though there is no fixed minimum or maximum.⁹

To advance from one phase to the next, an inmate must demonstrate at least six months of clear conduct, actively participate in and complete all recommended programs, show respectful behavior toward staff and other inmates, and maintain acceptable personal hygiene and cell conditions. A Step-Down Review Committee evaluates each candidate, and the central question is whether the inmate can function safely in a less restrictive setting without threatening institutional security. Inmates who complete the Pre-Transfer phase may be moved out of ADMAX entirely to a lower-security federal facility.⁹

Mental Health and Medical Services

Extended time in maximum security takes a severe psychological toll. The isolation, lack of meaningful human contact, and sensory deprivation can trigger or worsen mental illness, and both systems have been pushed to respond.

The Bureau of Prisons’ current mental health policy requires screening at intake and again upon arrival at each institution to assess for mental illness and suicide risk. Psychology treatment programs must use evidence-based practices, and a Care Coordination and Reentry Team coordinates treatment between psychology and medical staff. For inmates in restrictive housing specifically, the Bureau uses enhanced screening, evaluation, and mental health intervention procedures. A “mental health companion” peer support program provides additional assistance to inmates with mental illness.¹⁰

At the complex outside Florence, the Bureau operates dedicated mental health treatment units developed as part of a 2016 settlement in Cunningham v. Federal Bureau of Prisons, a class action alleging that ADMAX failed to adequately screen for, diagnose, and treat mental illness. The settlement required screening of all ADMAX inmates, group therapy facilities, private counseling areas, enhanced recreation for at-risk inmates, and a court-appointed monitor to oversee compliance.

On the state side, Colorado addressed the mental health gap by repurposing part of Centennial Correctional Facility. CCF-North operates a Residential Treatment Program specifically for inmates with serious mental illness drawn from all custody levels across the state system.² Inmates needing intensive psychiatric care are not simply left in standard maximum-security cells where treatment access is minimal.

Visitation and Communication

Visiting an inmate in maximum security requires advance planning and a formal approval process. The Colorado Department of Corrections requires every potential visitor to apply and undergo a background check before being placed on an inmate’s approved visitor list. Visitors with active felony or misdemeanor warrants are denied. Background checks are repeated annually for all active visitors.¹¹¹²

For inmates in restrictive housing, visits are non-contact, conducted through a barrier, with communication handled via a phone handset or intercom. Video visitation exists but currently supplements rather than replaces in-person visits. Colorado passed legislation in 2025 (HB25-1023) establishing visitation as a protected right and limiting the state’s ability to deny contact visits for more than 30 days or phone access for more than five days. How that applies in the most restrictive maximum-security settings is still being worked out through administrative regulations.

Mail and phone calls are continuously monitored. At several facilities, including the Colorado State Penitentiary, all incoming mail is photocopied, the copy is delivered to the inmate, and the original is destroyed. This policy, implemented under an Office of Inspector General directive, prevents the introduction of prohibited substances through paper mail.¹³ Outgoing phone calls are limited in duration and restricted to pre-approved numbers.

Restrictive Housing Reforms Shaping the System

Colorado has been at the forefront of reducing reliance on solitary confinement. The state banned long-term solitary confinement exceeding 15 days in state prisons in 2017, and subsequent legislation extended restrictions to local jails. HB 21-1211, effective July 2022, specifically prohibits jails with more than 400 beds from involuntarily placing certain vulnerable individuals in restrictive housing. Protected categories include people diagnosed with serious mental illness, pregnant individuals, those under 18, and people with significant cognitive or developmental disabilities.¹⁴

When a vulnerable individual must be placed in restrictive housing because no alternative exists and they pose an immediate danger, the jail must document the circumstances, notify medical or mental health staff within 12 hours, and contact the individual’s legal representative or emergency contact. Staff must check on the individual at least twice per hour, and a mental health professional must reassess continued placement every 48 hours. Holding someone beyond 15 days in a single month requires a court order.¹⁴

Combined with the step-down programs, these reforms reflect a broader shift. The state moved from a system that relied heavily on indefinite isolation toward one that treats maximum-security restrictive housing as a temporary status with structured pathways out. An inmate placed in a Level V facility today faces a fundamentally different trajectory than one placed there a decade ago, with the expectation of movement toward less restrictive conditions rather than indefinite confinement.

1
Justia. Colorado Code 17-1-104.3 – Correctional Facilities – Locations – Security Level – Report
2
Colorado Department of Corrections. Centennial Correctional Facility
3
Federal Bureau of Prisons. FCC Florence
4
Office of the Law Revision Counsel. 18 USC 3621 – Imprisonment of a Convicted Person
5
Colorado Department of Corrections. Classifications
6
Federal Bureau of Prisons. Inmate Security Designation and Custody Classification
7
eCFR. 28 CFR Part 524 – Classification of Inmates
8
Colorado Department of Corrections. Open the Door – Segregation Reforms in Colorado
9
U.S. Department of State. Case No. 13.956 – Inmates of ADX – U.S. Further Observations
10
Federal Bureau of Prisons. Treatment and Care of Inmates with Mental Illness
11
Colorado Department of Corrections. General Information and Approval Process
12
Colorado Department of Corrections. Visiting Applications
13
Colorado Department of Corrections. Contact an Inmate
14
Colorado General Assembly. HB21-1211 Regulation of Restrictive Housing in Jails