United States Penitentiaries: Design, ADX Florence, and Locations

United States Penitentiaries are the highest-security tier of the federal prison system, and the Bureau of Prisons currently runs 16 of them across the country. Placement is driven by a point-based scoring system: a male inmate whose total reaches 24 or more points is designated to a USP, where he will live behind reinforced perimeters, in a single or two-person cell, under the tightest staff-to-inmate ratios and movement controls the federal system uses.

Who Gets Sent to a USP

The Bureau of Prisons uses an automated system called SENTRY to score every federal inmate on a handful of weighted factors.¹ Offense severity runs from 0 to 7 points. Criminal history runs from 0 to 10. A history of violence adds points scaled to how serious and how recent that violence was. Voluntary surrender subtracts three.

The cutoffs are fixed. Minimum security is 0 to 11 points, low is 12 to 15, medium is 16 to 23, and high — meaning a USP — is 24 and above.¹

Two overrides can push someone into a USP no matter what the point total says. The first is a Public Safety Factor. Inmates with more than 30 years remaining on their sentence, including those serving non-parolable life terms, go to a high-security institution automatically unless the factor is specifically waived.² Large-scale drug trafficking above certain weight thresholds triggers a “Greatest Severity” offense classification that can drive placement upward as well.

The second is a Management Variable, which lets staff bump an inmate up when their judgment says the risk doesn’t match the raw score. The classification team documents its reasoning when it deviates from what the number suggests.¹

How the Facilities Are Built

USPs have the most fortified perimeters in the federal system. The BOP describes them as featuring walls or reinforced fences with close control of inmate movement throughout.³ Many use double fencing lined with electronic detection systems that trigger alerts when anything contacts the wire. Older institutions, like the one at Terre Haute, rely on masonry walls instead. Armed officers staff observation points around the boundary.

Inside, housing is single-occupant or two-person cells rather than the open dormitories used at camps and some low-security facilities. Cells are built with heavy steel doors and reinforced concrete walls designed to hold up under force and contain disruptions during lockdowns. Staffing is denser here than anywhere else in the system. FY 2022 data showed high-security facilities running roughly 3 to 7 inmates per correctional officer, well below the 10-to-15 range typical at medium and low-security institutions.⁴

Daily Life Inside

Everything runs on a tight, enforced schedule. Inmates move through the facility in small groups or under direct escort, with structured windows for meals, recreation, and law library access. Recreation happens in fenced or enclosed outdoor areas. Movements are staggered so different housing units don’t overlap in common areas.

Staff run multiple formal counts throughout the day and night. Cell searches happen frequently and without notice; the point is to make concealment consistently difficult, not to react to specific tips.

Visitation follows stricter protocols than at lower-security institutions, but contact visits are generally allowed. BOP policy permits a handshake, embrace, and kiss at the beginning and end of a visit unless staff have clear evidence that contact would create a security risk.⁵ Non-contact visits behind glass are not the default at most USPs; that level of restriction typically applies at ADX Florence or where specific circumstances warrant it.

Monthly commissary spending is capped at $360 across the federal system. Individual wardens can set a lower ceiling but cannot go above the national one.⁶

Contact With the Outside

Phone and electronic messaging are the two channels, both monitored. Inmates who participate in First Step Act evidence-based recidivism reduction programs get 300 free phone minutes per month; inmates who decline programming pay for their own minutes.⁷

The electronic messaging system, TRULINCS, lets inmates exchange text-only messages with pre-approved contacts. It is not internet access. Inmates cannot browse websites, receive attachments, or write to anyone outside their approved list. Every message in and out is monitored and retained, and both the inmate and the outside contact consent to that monitoring as a condition of using the system.⁸ Attorney communications sent through TRULINCS are not treated as privileged. Access can be revoked entirely for inmates in the Special Housing Unit, and inmates under investigation for misusing the system face restrictions in 30-day increments, renewable by the warden.

When a USP Isn’t Enough: SMUs and ADX Florence

Some inmates prove too dangerous or disruptive even for general population at a USP. For them, the BOP maintains Special Management Units. Referral to an SMU can be triggered by gang-related activity, leadership in disruptive groups, a pattern of serious disciplinary infractions, or organizing group misconduct that destabilized a facility. An inmate must have at least 24 months remaining on their sentence to be designated to one.⁹

At the top of the hierarchy sits the Administrative Maximum facility in Florence, Colorado, the only federal supermax. ADX Florence confines inmates to solitary cells for approximately 23 hours per day. There is virtually no social interaction with other inmates: no group recreation, no shared meals, no common-area activities. Each cell measures roughly 7 by 12 feet.³ The population includes inmates with chronic disciplinary problems at other facilities, those who have killed other inmates or staff, gang leaders, high-profile criminals, and individuals who pose national security threats, including convicted terrorists and spies.

Mental Health Carve-Outs

The BOP classifies inmates into four mental health care levels. CARE1 means no significant needs, CARE2 covers routine outpatient or crisis care, CARE3 involves enhanced outpatient or residential treatment, and CARE4 requires inpatient psychiatric care available only at designated Medical Referral Centers.¹⁰

CARE3 inmates are generally diverted away from SMU or ADX placement. CARE4 inmates are not placed in those settings at all. The only exception is when “extraordinary security needs” exist that cannot be managed elsewhere, and even then the BOP must develop an individualized treatment plan.¹⁰ Advocates have long argued that isolation conditions at ADX are themselves harmful to mental health, regardless of what treatment plans exist on paper.

Inmates in extended restrictive housing get mandatory mental health evaluations on a schedule tied to their setting: every 6 months in a Special Housing Unit, every 12 months at ADX, and every 18 months in a Special Management Unit. A multidisciplinary team reviews CARE4 inmates at least quarterly and CARE3 inmates at least twice a year.¹⁰

Getting Reclassified or Transferred Out

The BOP reviews every inmate’s custody classification at least once every 12 months. The first review comes roughly 7 months after arrival at the designated institution. Reviews outside the normal cycle can be triggered by new disciplinary charges, a new sentence, or a sentence reduction.²

The key benchmark for stepping down to a lower-security facility is 18 consecutive months of clear conduct in general population. Meeting it makes an inmate eligible for consideration but does not guarantee a move.¹

An inmate who disagrees with a classification decision can use the Administrative Remedy Program, a formal three-level appeals process:¹¹

Informal resolution (BP-8) with staff, which can be waived with an acceptable reason.
Institutional request (BP-9) to the warden within 20 calendar days of the triggering event.
Regional appeal (BP-10) to the Regional Director within 20 calendar days of the warden’s response.
Central Office appeal (BP-11) to the BOP General Counsel within 30 calendar days of the regional response, the final step inside the BOP.

Deadlines can be extended for valid reasons, including time in transit or physical incapacity. An inmate who believes filing at the institutional level would endanger their safety can submit directly to the Regional Director by marking the request “Sensitive.”¹¹

Where the 16 USPs Are

The BOP currently operates 16 active USP-designated facilities:¹²

Allenwood USP, White Deer, Pennsylvania
Atwater USP, Atwater, California
Beaumont USP, Beaumont, Texas
Big Sandy USP, Inez, Kentucky
Canaan USP, Waymart, Pennsylvania
Coleman I USP, Coleman, Florida
Coleman II USP, Coleman, Florida
Florence ADMAX USP, Florence, Colorado
Florence High USP, Florence, Colorado
Hazelton USP, Bruceton Mills, West Virginia
Lee USP, Pennington Gap, Virginia
McCreary USP, Pine Knot, Kentucky
Pollock USP, Pollock, Louisiana
Terre Haute USP, Terre Haute, Indiana
Tucson USP, Tucson, Arizona
Victorville USP, Victorville, California

Some historically well-known federal penitentiaries no longer carry the USP designation. Leavenworth now houses medium-security inmates, and both Marion, which pioneered the supermax model in the 1980s before ADX Florence opened, and Lewisburg operate today as medium-security Federal Correctional Institutions.³

1
Federal Bureau of Prisons. Program Statement 5100.08 – Inmate Security Designation and Custody Classification
2
Federal Bureau of Prisons. Program Statement 5100.08 CN-2 – Inmate Security Designation and Custody Classification
3
Federal Bureau of Prisons. Federal Prisons
4
Federal Bureau of Prisons. Inmate to Correctional Officer Ratio FY 2022 Fourth Quarter Report
5
Federal Bureau of Prisons. Visiting Regulations
6
Federal Bureau of Prisons. Program Statement 4500.12 – Trust Fund/Deposit Fund Manual
7
Federal Bureau of Prisons. FBOP Updates to Phone Call Policies and Time Credit System
8
Federal Bureau of Prisons. Trust Fund Limited Inmate Computer System (TRULINCS) – Electronic Messaging
9
Federal Bureau of Prisons. Program Statement 5217.02 – Special Management Units
10
Federal Bureau of Prisons. Program Statement 5310.16 CN-1 – Treatment and Care of Inmates with Mental Illness
11
Federal Bureau of Prisons. Administrative Remedy Program
12
Federal Bureau of Prisons. List of Our Facilities