The Illinois Department of Corrections says the planned closure of a central Illinois prison could mean 1,500 inmates would be housed in prison gyms.

The department detailed the scenario involving the medium-security Logan Correctional Center near Lincoln in a required report to the Commission on Government Forecasting and Accountability. The closure also could mean crowding-related lawsuits.

Illinois Gov. Pat Quinn has called the closure unavoidable given budget cuts by lawmakers. The union representing many of the affected prison workers says the move could endanger corrections workers and inmates.

Meanwhile, plans to close a maximum-security state mental-health center in Chester could require hundreds of thousands of dollars in upgrades at sites elsewhere to accommodate patients.