Southland Holdings highlights Dallas Mill Creek Drainage Relief Tunnel build with 170,000 cubic yards of concrete liner

Southland Holdings highlighted work on the Mill Creek Drainage Relief Tunnel, a five-mile stormwater tunnel project in Dallas, Texas.

• The project is described as North America’s largest stormwater relief effort, driven by long-standing flooding risks along the corridor.
• The main tunnel includes a 15-inch unreinforced concrete liner totaling 130,000 cubic yards, or roughly 170,000 cubic yards across the full job.
• Concrete deliveries travel up to five miles underground, with production aimed at faster strength gain to accelerate form stripping.
• The work scope includes eight shafts, 100 to 180 feet deep, supporting tunnel excavation through the Austin Chalk limestone formation.