Built for 434.
Housing more than 600.
Learn about the Yellowstone County Detention Facility and the proposed expansion on the November 3, 2026 ballot.
Why This Matters
Yellowstone County's detention facility was built in 1986. After multiple expansions, current rated capacity is 434 inmates. Today it regularly holds more than 600, about 50% over its rated capacity. To address current conditions and plan for the next 20 years, the county is proposing an expansion and renovation of the facility, funded by a bond and operations levy on the November 3, 2026 ballot.
Inside the Current Facility
The Yellowstone County Detention Facility operates about 50% above capacity. On most days, more than 600 people are housed in a facility built for 434 inmates. This affects daily operations, the working environment for staff, and how the facility meets the needs of Yellowstone County.
How the Facility Has Changed Over Time
The Yellowstone County Detention Facility has undergone several renovations and expansions throughout its history. These projects were completed to address operational needs, support detention services, and improve facility functions.
The Yellowstone County Detention Facility has undergone several renovations and expansions since it opened in 1986. Each project was completed to address operational needs, support detention services, and improve facility functions, including the women's housing wing, and the 72-hour short-term holding facility. Explore the full timeline to see how the facility has changed alongside Yellowstone County.
Hear from the people who work inside the Yellowstone County Detention Facility every day.
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Frequently Asked Questions
We know this is a significant investment. Find answers to common questions about the bond, the design, and what this means for Yellowstone County residents.