ICE Detention

Cascade County Adult Detention Center

Cascade County Adult Detention Center: the county roster excludes federal inmates; personal mail is scanned to tablets and originals are discarded.

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ICE detainee locator notice (checked October 7, 2026): since September 15, 2026, ICE's Online Detainee Locator no longer shows people who have a final order of removal, and ICE staff have reportedly been told not to give their location to family or lawyers, according to the Associated Press and the American Immigration Council. AP reports the change affects more than 16,000 of the nearly 69,000 people in ICE detention. ICE has not announced or confirmed the change; DHS said all detainees have opportunities to communicate with their family members and lawyers. Per the AP, the practice does not apply to detainees held at the Adelanto, California facility or at temporary holding facilities in Minneapolis, New York City or suburban Chicago, where judges have ordered ICE to list them in the locator.

If the locator shows no result for someone you know is detained, that does not mean they were released. Contact their attorney, the detention facility, or the ICE field office.

The Cascade County Adult Detention Center in Great Falls, Montana is operated by the Cascade County Sheriff’s Office. ICE’s fiscal year 2026 detention statistics list it as “CASCADE COUNTY JAIL, MT”.

Facility quick reference

Item	Detail
Facility name	Cascade County Adult Detention Center
Operator	Cascade County Sheriff’s Office
Street address	3800 Ulm North Frontage Road
City, State, ZIP	Great Falls, MT. 59404
Main phone	406-454-6820 (the roster page’s contact for errors)
Inmate roster	County roster; excludes federal inmates
How ICE uses it	ICE uses this facility through a U.S. Marshals Service intergovernmental agreement — the jail’s agreement is with the Marshals, and ICE houses people there under it.
ERO field office	Salt Lake City Field Office
ICE detainee locator	locator.ice.gov
Last verified	2026-10-23

ICE detention statistics — fiscal year 2026

average daily population (FY2026)

4.7

average days length of stay (FY2026)

ADP = average daily population; ALOS = average length of stay, both FY2026 averages (not a same-day count). Source: ICE Detention Management, FY2026 (released 2026-07-20).

How to find someone held here

ICE’s Online Detainee Locator System is the ICE locator. The Sheriff’s roster page explicitly says: “The roster does NOT include Federal inmates per Federal law.” It directs questions about roster errors to the Cascade County Detention Center at 406-454-6820.

Visiting

The county’s Adult Detention Center visitation rules publish the following schedule, with “1/45 minute visits per weekend”:

Saturday: 0830 – 1645 hrs.
Sunday: 0830 - 1645 hrs.
G/H units: 08:30-12:15; J/K units: 12:30-1645.

The rules say not to arrive more than 15 minutes before the scheduled visit. No more than four (4) people, including children, may attend a non-contact visit. Visitors must bring current, non-expired state or federal picture identification; the rules list identification with picture as “(no wallets or purses)”.

Money, phone calls and mail

Money. The Sheriff’s page lists a kiosk in the CCSO lobby and Accesscorrections.com for deposits. It also allows a mailed money order addressed with the inmate’s first and last name at 3800 Ulm North Frontage Road, Great Falls, MT 59404.

Phone calls. The same page names Securus Technologies as the inmate telephone provider. Its billing and access contact is 800-844-6591, 24-hours a day.

Personal mail. The Sheriff’s Office says all personal mail is opened, inspected, scanned through its Digital Mailing Center (DMC), and distributed to the inmate’s tablet. Originals are discarded after scanning. Mail must include the inmate’s full name, the sender’s full name and address, and be 10 pages or less per envelope. The published format is:

Cascade County Detention Facility
John Doe
3800 Ulm North Frontage Road
Great Falls, MT. 59404

Oversight and inspections

ODO special review, October 24 to 26, 2023. ICE’s report naming Cascade County Jail assessed the facility against NDS 2019; ODO says its assigned rating is for ERO’s information purposes only. ODO found 24 deficiencies in 6 standards. Its Medical Care findings included initial medical, dental and mental-health screenings, in some of the files reviewed, between 16 and 122 hours after arrival, instead of within the required 12 hours. ODO recommended increased ERO Salt Lake City oversight and work to resolve deficiencies under contractual obligations.

Separate PREA audit in 2026. The county’s final PREA report gives on-site dates of 2026-02-09 through 2026-02-10 and a final submission date of September 11, 2026. Its final summary lists 0 standards exceeded, 45 met and 0 not met. It describes missing specialized training for some medical and mental-health staff; training documentation supplied before the interim report resolved that corrective action. It also found that reassessments were not occurring in practice and lacked reliable tracking. The facility developed an alert after 20 days in custody; the auditor reviewed eleven screenings, and documentation supplied in May and on August 4, 2026 resolved that corrective action.

Last verified: 2026-10-23

General information, not legal advice. Deposit, visiting, phone and mail arrangements are set by the Cascade County Sheriff’s Office and its vendors and can change at any time; details above were checked against the operator’s own pages and ICE’s published documents on October 23, 2026. The jail’s own current instructions take precedence over this page. For a specific case, contact a licensed immigration attorney or a BIA-accredited representative.

Frequently asked questions

Does the Cascade County roster include federal inmates?

No. The Sheriff’s roster page explicitly says the roster does NOT include Federal inmates per Federal law.

What happens to personal mail at Cascade County?

The Sheriff’s Office says personal mail is opened, inspected and scanned to the inmate’s tablet through the Digital Mailing Center. Original mailings are discarded after scanning. Each envelope must contain 10 pages or less.

Who provides inmate telephone service?

The Sheriff’s Office names Securus Technologies and publishes 800-844-6591, 24-hours a day, for billing and access questions.

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General information, not legal advice. MigrantUSA is an independent publisher and is not a law firm; using this site does not create an attorney-client relationship, and this content is not a substitute for advice from a licensed attorney about your specific situation. US federal, state, and local government procedures, fees, and forms change. Always verify current details directly with the relevant agency before acting. For immigration, tax, or other legal matters specific to your situation, consult a licensed attorney or BIA-accredited representative.