Central Artery/Third Harbor Tunnel Project

Central Artery/Third Harbor Tunnel Project
Name	Central Artery/Third Harbor Tunnel Project
Alternate names	Big Dig
Location	Boston, Massachusetts
Status	Completed (2007)
Started	1982 (planning), 1991 (major construction)
Completed	2007
Cost	~$15 billion (2007 dollars)
Owner	Massachusetts Department of Transportation

Central Artery/Third Harbor Tunnel Project The Central Artery/Third Harbor Tunnel Project was a major urban infrastructure program in Boston and Massachusetts that rerouted the elevated Interstate 93 through a tunnel beneath the city and constructed the Ted Williams Tunnel under Boston Harbor. It connected multiple transportation corridors including the Massachusetts Turnpike and reshaped downtown Boston urban fabric while involving federal and state agencies such as the Federal Highway Administration and the Massachusetts Turnpike Authority. The program influenced numerous engineering, legal, environmental, and political fields through collaborations with institutions like MIT, Harvard University, and private firms.

Background and Planning

Initial concepts emerged from mid-20th-century urban highway proposals including plans by the Massachusetts Department of Public Works and studies linked to the Interstate Highway System under the Federal-Aid Highway Act of 1956. Early advocacy involved municipal leaders such as John F. Collins and Kevin H. White, and transportation planners from Boston Redevelopment Authority and Harvard Graduate School of Design. Environmental review processes invoked statutes administered by the Environmental Protection Agency and the National Environmental Policy Act while consultations included entities like the U.S. Army Corps of Engineers, Massachusetts Audubon Society, and Conservation Law Foundation. Planning workshops engaged civic groups including the Boston Society of Architects, Greater Boston Chamber of Commerce, and neighborhood organizations from South Boston, North End, and Charlestown.

Design and Construction

Design and construction were led by a consortium of engineering and construction firms such as Bechtel Corporation, Parsons Brinckerhoff, Fluor Corporation, Moses S. Sprecher Company, and Suffolk Construction. Structural designs referenced standards from the American Society of Civil Engineers and collaboration with academic research at Massachusetts Institute of Technology and Northeastern University. Key components included the buried Central Artery, the O'Neill Tunnel, the Zakim Bunker Hill Bridge (officially Leonard P. Zakim Bunker Hill Memorial Bridge), and the Ted Williams Tunnel. Techniques used drew from precedents like the Channel Tunnel and Big Dig-era tunneling practices: slurry walls, cut-and-cover, and tunnel-boring considerations similar to Boston Harbor Project dredging projects. Construction interacted with rail infrastructure including MBTA commuter rail and Amtrak operations at South Station and interfaces with Logan International Airport via the Massport authority.

Tolling, Operations, and Maintenance

Tolling strategies for the Ted Williams Tunnel and connections involved agencies such as the Massachusetts Port Authority (Massport) and the Massachusetts Department of Transportation. Toll collection evolved from cash booths to electronic systems influenced by technology providers and models used by E-ZPass and the New York State Thruway Authority. Operations relied on traffic management coordination with Metropolitan Boston Transportation Planning Organization and emergency services including the Boston Fire Department and Boston Police Department. Maintenance regimes referenced manuals from the American Association of State Highway and Transportation Officials and contractor performance tied to entities like Turner Construction Company and private maintenance contractors, with oversight from the Office of the Inspector General (Massachusetts).

Environmental and Community Impact

Environmental assessment considered impacts on Boston Harbor, air quality standards enforced by the Clean Air Act and EPA, noise affecting neighborhoods such as South Boston and West End, and water management in coordination with the U.S. Environmental Protection Agency and Massachusetts Department of Environmental Protection. Community mitigation involved land reuse plans with the Boston Redevelopment Authority producing parks like the Rose Fitzgerald Kennedy Greenway. Cultural institutions including the Museum of Science, Institute of Contemporary Art, and neighborhood historical societies engaged in mitigation and memorialization. Public health studies referenced work from Harvard School of Public Health and community organizations such as the Boston Neighborhood Health Center.

Cost, Funding, and Economic Effects

Funding blended federal contributions from the Federal Highway Administration, state bonds issued by the Commonwealth of Massachusetts, and revenue mechanisms involving the Massachusetts Turnpike Authority. Economic analyses referenced studies by University of Massachusetts, Harvard Kennedy School, and consulting firms addressing cost overruns and regional economic impacts on Greater Boston and sectors like logistics and tourism. Private litigation and settlements affected financial outcomes involving insurers such as Aetna and law firms including Ropes & Gray. Construction procurement and bond issuance involved financial institutions like Bank of America and Goldman Sachs.

Controversies and Legal Issues

The program generated legal challenges, criminal investigations, and public controversy involving figures such as William F. Weld (as governor during parts of the project era) and scrutiny from the U.S. Department of Transportation Inspector General. High-profile incidents included corruption probes, cost overruns, and structural failures that led to litigation in state and federal courts, with cases argued by firms like Goodwin Procter and oversight by the Massachusetts Attorney General and Office of Inspector General (U.S. Department of Transportation). Safety incidents prompted reforms in construction oversight and contract management, invoking legislative attention from the Massachusetts General Court and audits by the Government Accountability Office.

Legacy and Long-term Outcomes

The project reshaped Boston urban form, catalyzed redevelopment in neighborhoods including Seaport District and Bulfinch Triangle, and influenced transportation policy at institutions such as the Federal Highway Administration and Regional Plan Association. Engineering and governance lessons informed later projects like the Big Dig-inspired tunnel and bridge programs nationwide and academic curricula at MIT, Tufts University, and Boston University. Cultural memory includes mentions in works by authors associated with Beacon Press and coverage in media outlets such as The Boston Globe and The New York Times. The corridor remains managed by Massachusetts Department of Transportation with ongoing maintenance, monitoring, and community stewardship coordinated with local institutions including Boston Parks and Recreation Department and civic groups.

Category:Infrastructure in Boston