Close 
Menu 
White Papers
Project Clear: Efficient Hard Rock Tunneling below St. Louis, Missouri
The Metropolitan St. Louis Water District’s Project Clear is a 28-year program targeting water quality and wastewater capacity throughout St. Louis, MO. The extensive program involves multiple tunnels, including Deer Creek, a 6.3 km long tunnel being bored with the largest TBM ever used in the St. Louis area (6.5 m in diameter). Another tunnel, Jefferson Barracks, is using TBM components that have bored over 40 km of tunnel since 1981.
Recent Posts
- Rock Tunnels at High Water Pressure: Non-Continuous Pressurized TBMs vs. Slurry
- Hybrid TBM Excavation in Challenging Mixed Ground Conditions at the Mumbai Metro
- TBM Excavation in Himalayan Geology: Over 1,200 Meters per Month at the Bheri Babai Diversion Multipurpose Project
- Tunneling through 48 Fault Zones and High Water Pressures on Turkey’s Gerede Water Transmission Tunnel
- Overcoming Multiple Caverns: Successful TBM Tunneling in Karst Geology at Galerie des Janots