Colorado's 'Prison Alley' Home to Notorious Supermax Facility

The small town of Florence contains multiple correctional facilities, including the high-security ADX Florence prison.

Apr. 7, 2026 at 2:41pm

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An extreme close-up photograph of a set of metal prison bars lit by a harsh, direct camera flash against a pitch-black background, creating a stark, gritty, investigative aesthetic.The harsh, unforgiving lighting and close-up perspective on the prison bars evoke the severe, restrictive nature of Colorado's high-security correctional facilities.Delta Today

Colorado is home to a surprising number of prisons scattered across the state, with a concentration in the small town of Florence, which has become known as 'Prison Alley.' The most notorious facility in the area is the ADX Florence, also known as the Supermax, which houses some of the country's most dangerous criminals in a high-security setting.

Why it matters

The presence of so many prisons, especially the high-profile Supermax facility, highlights Colorado's role in the U.S. criminal justice system and raises questions about the state's approach to incarceration and rehabilitation. The concentration of prisons in Florence also impacts the local economy and community.

The details

Florence, a small town just west of Pueblo, is home to multiple correctional facilities, including the ADX Florence, also known as the Supermax. This federal prison is operated by the U.S. Department of Justice and is considered one of the most secure and restrictive prisons in the country, housing some of the nation's most dangerous criminals. The town's collection of prisons has earned it the nickname 'Prison Alley.'

  • The ADX Florence, or Supermax, prison opened in 1994.
  • Colorado has had a significant prison population for decades, with the first state prison opening in Cañon City in the late 1800s.

The players

ADX Florence

Also known as the Supermax, this is a high-security federal prison operated by the U.S. Department of Justice that houses some of the country's most dangerous criminals.

Florence, Colorado

A small town in Colorado that has become known as 'Prison Alley' due to the concentration of correctional facilities in the area, including the notorious ADX Florence Supermax prison.

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The takeaway

The presence of so many prisons, especially the high-profile Supermax facility, in the small town of Florence highlights Colorado's significant role in the U.S. criminal justice system and raises important questions about the state's approach to incarceration and rehabilitation, as well as the impact on local communities.