ADX Florence
| Location | 5880 Highway 67 South, Florence, Colorado (part of the Federal Correctional Complex) |
|---|---|
| Status | Active |
| Classification | Administrative Maximum (supermax) |
| Capacity | approximately 474 (design) |
| Population | approximately 405–408 (spring 2026) |
| Opened | January 10, 1995 |
| Managed by | Federal Bureau of Prisons |
ADX Florence (the United States Penitentiary, Florence ADMAX) is the federal supermax prison in Florence, Colorado — the highest-security facility in the Federal Bureau of Prisons system, built to hold prisoners who cannot be managed at any other penitentiary. Opened January 10, 1995, in the aftermath of the 1983 murder of two guards at USP Marion, it was designed for one purpose: no escapes, no contact with the outside world, no ability to direct criminal activity from inside.
Inmates — all male — spend approximately 23 hours a day in single cells. The population has actually declined in recent years (roughly 405 in spring 2026 against a design capacity near 474, with two housing units closed by 2021), as the BOP has explored step-down alternatives for aging supermax prisoners.
Unit Structure
General-population units are named Delta, Echo, Fox, and Golf. Beyond them sit the layered control apparatus: the Special Housing Unit (SHU); H Unit (the Special Security Unit, holding terrorists and inmates under Special Administrative Measures); the Control Unit (the worst conduct violations and gang leadership); step-down units Kilo and Joker for gradual de-escalation; and Range 13 — the four-cell tightest-control wing, whose publicly known occupants have included Ramzi Yousef, Thomas Silverstein, and Joaquín 'El Chapo' Guzmán.
How Someone Gets Designated to ADX
There is no sentence to ADX — designation is administrative. The BOP sends prisoners whose conduct or profile makes every lesser facility unworkable: terrorists under Special Administrative Measures, cartel leadership, spies, high-profile escape risks, and inmates who have committed violent acts inside other prisons. The stated goal is step-down transfer back to lesser custody, in principle within about three years, though in practice many spend far longer.
Daily Life
Cells are concrete, sound-proofed toward the corridor, with a shower and a slit window facing a concrete wall. Meals arrive through a slot. Recreation is solo, indoors or in single outdoor pens. Communications are restricted, and for SAMs inmates, monitored and pre-approved. Former inmates describe the defining feature as isolation — from other prisoners, from staff, and from time itself.
The 2025–2026 News Cycle
Rafael Caro Quintero — the Guadalajara cartel founder extradited from Mexico in February 2025 — was housed at ADX pending trial. Ismael 'El Mayo' Zambada was sentenced to life in July 2026; his lawyers asked the court to spare him El Chapo's supermax fate. In December 2025, inmate Timothy Sowinski, 57, was found unresponsive and died — one of the facility's rare publicized deaths. In April 2025, the Attorney General directed prosecutors to seek the death penalty for ADX inmate Ishmael Petty for a 2020 in-custody strangling — reported as the first capital case under the expanded policy.
In the News
- Mexican drug lord Rafael Caro Quintero extradited to US — Caro Quintero in the 29-prisoner transfer, housed at ADX. AP (February 2025). [1]
- 'El Mayo' Zambada sentenced to life in US prison — Zambada held at ADX; lawyers sought to avoid supermax. CBS News (July 20, 2026). [2]
- Inmate dies at ADX Florence supermax — Timothy Sowinski, 57, found unresponsive. Denver Post (December 8, 2025). [3]
- Caro Quintero due in US court after mass extradition — the February 2025 extradition flight. Reuters (February 28, 2025). [4]
Community Discussions
First-person threads from Reddit (r/prison and similar communities) — useful for what the official sources don't say:
- r/AMA — I was at the ADX Federal Supermax prison — firsthand AMA on long-term isolation
- r/Prison — what is daily life at ADX Florence like? — 23-hour lockdown mechanics
- r/Prison — video on my time in ADX — ex-inmate account
Notable Detainees and Residents
- Joaquín 'El Chapo' Guzmán — Sinaloa cartel leader, life sentence, Range 13
- Dzhokhar Tsarnaev — Boston Marathon bomber, death row
- Ramzi Yousef — 1993 World Trade Center bombing, Range 13
- Terry Nichols — Oklahoma City bombing, 161 life terms
- Richard Reid — the shoe bomber
- Zacarias Moussaoui — 9/11 conspirator
- Eric Rudolph — Atlanta Olympics bomber
- Rafael Caro Quintero — Guadalajara cartel founder, extradited February 2025
- Ismael 'El Mayo' Zambada — Sinaloa cartel co-founder, life sentence July 2026
- Michael Swango — serial-killer physician
- Timothy McVeigh (historical) — Oklahoma City bomber, executed 2001
- Ted Kaczynski (historical) — the Unabomber, died 2023 after transfer
See Also
References
- ↑ "Mexican drug lord Rafael Caro Quintero extradited to US". AP. Retrieved November 10, 2026.
- ↑ "'El Mayo' Zambada sentenced to life in US prison". CBS News. Retrieved November 10, 2026.
- ↑ "Inmate dies at ADX Florence supermax". Denver Post. Retrieved November 10, 2026.
- ↑ "Caro Quintero due in US court after mass extradition". Reuters. Retrieved November 10, 2026.