Walnut Grove Correctional Facility Walnut Grove, Mississippi Correctional Contract amount: $4,433,700 Start date: December 1999 Completion date: January 2001 The Walnut Grove Correctional Facility built at Walnut Grove, Mississippi is a 376,000 square foot juvenile detention center. Ivey Mechanical services installed 43 units in the attic. The project completed in 13 months.