CONTACT & LOCATIONS NEWS MARKETS SERVICES PROJECTS ABOUT CAREERS SERVICES Tunneling / Underground Innovative tunneling solutions to fit specific challenges Our excellent reputation in tunnel design is earned through experience, including the world’s largest diameter soft-ground tunnel; the world’s first and only vertical, continuously spiral-lined shaft; the largest deep-transit station in soils in the United States; and instrumentation for major tunnel installations. Our staff is experienced in designing and managing construction for tunnels that involve a wide range of excavation techniques, including drill and blast, roadheader, tunnel-boring machine, earth-pressure-balance machine, slurry machine, sequential excavation method, micro-tunneling, pipe-jacking, and directional drilling. SERVICES INCLUDE: Subsurface exploration and route selection Design recommendations for soil and rock Tunnel and liner method selection Ground improvement Dewatering Plans, specifications, and engineering construction estimates Construction monitoring Tunnel condition assessment and rehabilitation recommendations TUNNELING/UNDERGROUND PROJECTS Alaskan Way Viaduct Replacement Program MORE Beacon Hill Link Light Rail Project MORE Henderson Combined Sewer Overflow Reduction Project Water MORE Oregon Rail Tunnel Assessment & Double-Stack Clearance Study Transportation MORE Lake Fort Smith Dam Water MORE Columbia Water Supply Project Water MORE Argo Tunnel Flow Structure Water MORE Florida Interceptor Project Water MORE Colsman Tunnel Sanitary Sewer Rehabilitation Water MORE PAR 1232 Second Creek Interceptor Project Water MORE SEE ALL PROJECTS Let's Talk About Your Project GET IN TOUCH MARKETS Transportation Water Property Development Industrial Federal SERVICES Geotechnical Engineering Contamination / Remediation Geologic Hazards Natural Resources Water Resources Design-Build Tunneling / Underground Arctic Engineering Construction Management Specialty Services ABOUT The Company People Corporate Responsibility/Scholarships CONTACT & LOCATIONS Seattle Anchorage Chicago Denver Fairbanks Jacksonville Los Angeles Madison Portland Sacramento Salt Lake City St. Louis Tri-Cities PROJECTS Explore CAREERS Working At Shannon & Wilson CONTACT & LOCATIONS NEWS CLIENT PORTAL © 2021 SHANNON & WILSON, INC. SEATTLE WEBSITE DESIGN