Wis. Stat. § 301.055: Prisoner population limits.

The department shall promulgate rules providing limits on the number of prisoners at all state prisons, but excluding those prisoners confined in the institution authorized under s. 301.046 (1) or in a Type 2 prison. The rules shall provide systemwide limits and limits for each state prison, except the department may provide a single limit for the Wisconsin correctional center system. The rules may provide procedures allowing the department to exceed any systemwide, institution or center system limit in an emergency situation.