Southland Holdings highlights Dallas Mill Creek Drainage Relief Tunnel build with 170,000 cubic yards of concrete liner
SLND•Mill Creek Drainage Relief Tunnel project in Dallas
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.




