USP Atwater (high-security)

Male

Gender

High

Security Level

1,187 (September 2023)

Population

United States Penitentiary, Atwater
1 Federal Way, Atwater, CA 95301
RDAP: No

United States Penitentiary, Atwater (USP Atwater) is a high-security federal prison for male inmates in Atwater, California. The site sits in Merced County, in the San Joaquin Valley, on land that was once part of Castle Air Force Base. The penitentiary opened in 2001. It is run by the Federal Bureau of Prisons. A minimum-security satellite camp shares the grounds and holds a separate, smaller inmate population. As of September 2023, the penitentiary held about 1,187 inmates.

Overview

USP Atwater is one of the federal system's high-security penitentiaries. It houses men who carry longer sentences, more serious disciplinary histories, or a need for closer supervision than a medium or low facility provides. The compound has a reinforced perimeter, controlled inmate movement, and separate housing for prisoners who cannot be kept in general population.

The mailing address is 1 Federal Way, Atwater, CA 95301. The adjoining camp operates at the minimum-security level. Camp inmates are typically nearing the end of their terms and live under far looser controls than the men inside the main penitentiary. The two facilities run as one institution under a single warden but keep their populations apart.

The site has a military past. Before the prison, the land belonged to Castle Air Force Base, which closed in the early 1990s. The penitentiary was built as part of a federal expansion of high-security capacity during that decade.

History

The Bureau of Prisons activated USP Atwater in 2001 and began taking inmates that year. It came online during a stretch when the federal government added several new high-security penitentiaries to keep pace with a rising prison population.

The institution has drawn attention for violence. On June 20, 2008, Correctional Officer Jose V. Rivera was stabbed to death inside a housing unit. Rivera was 22. He was trying to return two inmates, Joseph Cabrera Sablan and James Ninete Leon Guerrero, to their cell when Sablan attacked him with a homemade shank and Guerrero held him down. Rivera was stabbed more than twenty times. Both men were charged with the murder. Guerrero pleaded guilty in March 2014 and received life without parole. Sablan was sentenced to life without parole in September 2015 under a plea agreement that took the death penalty off the table. Rivera's death became a touchstone in debates over staffing and officer safety at federal penitentiaries.

Violence has not been confined to inmates and staff. In August 2006, inmate Juwan Ferguson beat his cellmate, Domosanies Slaughter, at the penitentiary. Slaughter died days later.

The facility has stayed in the news through later staffing and safety problems. The American Federation of Government Employees, the union representing federal correctional officers, has flagged drug-exposure incidents at federal prisons, including airborne and contact exposure to synthetic substances that put staff at risk. The union has cited those hazards in its push for better protections at institutions of this type.

Notable Inmates and Incidents

In November 2023, correctional officer Sandra Munagay assaulted an inmate at USP Atwater and then tried to hide it. She pleaded guilty in 2024 to federal charges of deprivation of rights under color of law and falsification of a record in a federal investigation. Court records showed she struck the inmate and then filed a false report to justify the force. The Department of Justice Office of the Inspector General investigated the case, and the U.S. Attorney's Office for the Eastern District of California prosecuted it.

The penitentiary has also figured in major gang prosecutions. The Aryan Brotherhood ran a racketeering operation that reached into California prisons, directing drug trafficking and murders through smuggled cellphones. Members were tried and sentenced over conduct tied to that conspiracy. In May 2025, the Eastern District of California secured life sentences against members convicted of racketeering and murder in aid of racketeering.

Several inmates serving long federal terms have been held at USP Atwater. Jerry Whitworth, convicted in the Walker spy ring espionage case, received a 365-year sentence and has been designated here. Khalid Ali-M Aldawsari, convicted of attempting to use a weapon of mass destruction, is serving a life sentence.

Location and Visitation

USP Atwater is at 1 Federal Way, Atwater, CA 95301, in Merced County.

Visiting a high-security penitentiary takes advance approval. The Bureau of Prisons requires each visitor to be placed on an inmate's approved visiting list, which involves a background check before the first visit. Visitors pass through search procedures on arrival. Visits take place in a controlled visiting room under staff supervision. Rules on dates, times, dress, and what visitors may bring are specific and can change. For full and current visiting information, check the institution's official page on the Bureau of Prisons website: Official BOP Page. See also our Visitation Guide.

Daily life and programs

Situated in unincorporated Merced County, California, USP Atwater is a high-security United States Penitentiary just outside the city of Atwater and roughly 130 miles southeast of San Francisco. Activated in 2001 on former Castle Air Force Base land, the facility is managed by the Federal Bureau of Prisons as part of the agency's Western Region. The site pairs the high-security main institution, which confines adult men, with an adjacent minimum-security satellite camp. Bureau figures from 2023 put the combined population at roughly 1,180 to 1,280, with the large majority held inside the penitentiary itself. As at other USPs, the main institution is enclosed by a double perimeter fence equipped with electronic detection and armed patrol. Furthermore, inmate movement among housing units, work sites, education, and the yard is controlled and repeatedly halted for formal counts.

Daily life at Atwater follows a regimented schedule structured around standing counts, controlled movement, and limited out-of-cell time. This routine includes set periods for meals, work, programs, and recreation. Recreation takes place in enclosed yards and typically includes a walking track, basketball and handball, cable weight machines rather than free weights, stationary bikes, table tennis, and intramural sports. The yard is closed during counts, bad weather, or lockdowns. All work assignments are carried out inside the secure perimeter under direct staff supervision. Atwater holds a reputation as one of the more violent penitentiaries in the federal system. The institution possesses a documented history of inmate-on-staff and inmate-on-inmate assaults, and it has experienced extended lockdowns tied to violence and contraband.

Educational and vocational training form the core of programming at the penitentiary. Inmates who lack a high school credential are required to attend GED classes, and the facility additionally offers adult continuing education, parenting classes, and leisure programming. Apprenticeships at the main institution have included electrician, cook, HVAC, and teacher's aide, whereas the satellite camp provides its own distinct vocational tracks, such as landscape technician, stationary engineer, and teacher's aide. Employment through UNICOR (Federal Prison Industries) offers higher-paying work compared to ordinary institution jobs that yield only cents per hour. Furthermore, engaging in qualifying work and programs allows inmates to earn First Step Act time credits. Because published inmate guides indicate that the high-security institution does not host a Residential Drug Abuse Program (RDAP) unit, specific program availability should always be confirmed against current Bureau of Prisons listings.

The facility is best known for the June 20, 2008 murder of Correctional Officer Jose Rivera. A 22-year-old Navy veteran, Rivera was stabbed more than 20 times during an evening count by inmates Joseph Cabrera Sablan and James Ninete Leon Guerrero. Both inmates were already serving life terms for earlier killings, and both later received additional life sentences. In the aftermath, Rivera was memorialized by the Bureau as a fallen hero and honored through the union's Justice for Jose campaign. Other violence has included the 2006 killing of inmate Domosanies Slaughter in the Special Housing Unit. In 2024, a staff member working as a Supervisory Correctional Systems Specialist died at the institution. Federal prosecutors later indicted three inmates in a narcotics-distribution conspiracy connected to that death, with early reporting citing possible fentanyl exposure. Additionally, a widely cited 2017 escape from Atwater involved Darren Berg, a financial fraudster, who fled the minimum-security satellite camp rather than the high-security penitentiary.

First-hand accounts

First-person accounts and reporting about life at this facility. Experiences are individual and may not reflect current conditions.

• My prayers to the staff at USP Atwater - Reddit (correctional-staff perspective, high-security USP). Bureau of Prisons officers mourn a USP Atwater colleague (named in-thread as Marc Fischer), corroborated by 2024 reporting of a staff death and a later DOJ narcotics-conspiracy indictment; a rare first-hand staff-side thread specifically about the high-security institution.
• BOP applicant Atwater/Victorville/LA - Reddit (correctional-staff perspective, high-security USP). Prospective and current officers discuss working conditions at USP Atwater, describing it as a demanding, dangerous high-security post that draws San Francisco locality pay; first-hand staff commentary on the penitentiary.
• best federal prison to transfer to!? - Reddit (correctional-staff perspective). A correctional-officer couple asks where to transfer; USP Atwater is named among the recommended options, with staff weighing workload and location.
• Self surrendering at USP Atwater satellite camp. Any tips - Reddit (SATELLITE CAMP, minimum-security, NOT the high-security USP). First-hand self-surrender preparation thread for the Atwater minimum-security camp (18-month drug sentence); commenters describe camp life as low-conflict and white-collar. Concerns the adjacent camp, a different security level from the high-security penitentiary.
• Anyone Serve time at Atwater, CA Camp? - Reddit (SATELLITE CAMP, minimum-security, NOT the high-security USP). A person facing federal time seeks first-hand accounts of the Atwater camp; the sole reply speaks generally to federal camps. Again the minimum-security camp, distinct from the high-security USP.
• DC Corrections Information Council inspection report, USP Atwater — CIC. Primary oversight document including direct inmate-response quotes.

Please remember that experiences are unique and may not reflect today's experience.

Notable inmates

Name	Sentence	Offense	Dates
Demario Atwater	Life	Federal kidnapping and firearm charges in the 2008 abduction and murder of UNC student body president Eve Carson
Cristobal Veliz	Life	Orchestrating the murders of Ben Novack Jr. and Bernice Novack
Mohamud Salad Ali	Life	Piracy; involvement in the 2011 hijacking of the yacht Quest, during which four American hostages were killed
Solomon Pena	80 years (sentenced 2025)	Orchestrated a series of shootings at the homes of New Mexico Democratic officials after losing a 2022 state legislative race

References

USP Atwater. Public domain photograph, via Wikimedia Commons.