The Mill Street Viaduct Improvement Project focused on renovating the viaduct area spanning three city blocks on the west edge of downtown Jackson, near the restored Union Depot. The Mill Street Viaduct Improvement Project not only enhanced the physical aesthetics and functionality of the area but also reinforced the historic charm of downtown Jackson. By preserving and transforming this vital transportation infrastructure, the project contributes to the city’s overall vibrancy, fostering a renewed sense of community and connectivity. The key element is the Union Market building beneath the existing railroad bridge on the south side of Capitol Street. The Union Market features a new slab, ventilation, roll-up doors, metal ceiling, lighting, fountains, and a clock tower. Cosmetic enhancements, including brick veneer, metal ceilings, and lighting, are applied to the four viaducts. The east railroad embankment between Pascagoula and Pearl Streets is reinforced and landscaped, creating a sculpture plaza with modular retaining walls. Sidewalks are upgraded with precast pavers or concrete, accompanied by street lighting, landscaping, and storm drainage improvements.