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115-kV Transmission Line 115-kV Transmission Line
Siem Reap, Cambodia
Asian Development Bank and Cambodia Power Transmission LinesPower/Energy, Transmission & Distribution
14th Street Corridor - The Ambassador 14th Street Corridor - The Ambassador
Denver, Colorado, United States
City and County of Denver, Downtown Denver PartnershipVisualization, Design Visualization
50 Connaught Road Central 50 Connaught Road Central
Hong Kong
Apollo Global Real EstateProgram Management/Construction Management
63rd Street Connector 63rd Street Connector
Queens, New York, United States
Metropolitan Transportation Authority - New York City TransitRail, Tunneling & Geotechnical
796 Huai Hai Road Restoration 796 Huai Hai Road Restoration
Shanghai, China
Richemont GroupBuilding Engineering, Commercial & Retail
AC Transit State of Good Repair AC Transit State of Good Repair
California, United States
Alameda-Contra Costa TransitStrategic Consulting, Asset Management Strategy
Active Traffic Management Feasibility Studies Active Traffic Management Feasibility Studies
Seattle, Washington, United States
Washington State Department of TransportationIntelligent Transportation Systems
African Burial Ground Memorial African Burial Ground Memorial
New York, New York, United States
General Services Administration Government
Air Liquide Hydrogen Storage Cavern Air Liquide Hydrogen Storage Cavern
Spindletop, Texas, United States
Air Liquide Large Industries U.S., LPPower/Energy, Underground Storage, Program Management/Construction Management
Airport Link, Northern Busway (Windsor to Kedron) and Airport Roundabout Upgrade project Airport Link, Northern Busway (Windsor to Kedron) and Airport Roundabout Upgrade project
Brisbane, Queensland, Australia
Queensland GovernmentTransportation, Highways, Mass Transit, Bus, Mechanical/Electrical, Tunneling & Geotechnical

title

Boston Harbor Outfall Tunnel

Boston, Massachusetts, United States

Client: Massachusetts Water Resources Authority

Parsons Brinckerhoff Role: Design

Boston Harbor Outfall Tunnel
The Boston Harbor Effluent Outfall Tunnel was a key part of the Boston Harbor Project, a $4 billion effort to clean up Boston Harbor by providing new wastewater infrastructure including a new sewage treatment plant at Deer Island in Boston Harbor and an associated 9.5-mile (15.2-kilometer) outfall tunnel.

Parsons Brinckerhoff, as a subconsultant, designed the 25-foot-diameter (7.6-meter) tunnel on behalf of the Massachusetts Water Resources Authority (MWRA). One of the longest and largest outfalls in the world, the tunnel was a key part of the MWRA’s Boston Harbor Project, a court-ordered program to improve the water quality of Boston Harbor, making it swimmable and fishable. As part of its services, Parsons Brinckerhoff provided extensive geotechnical exploration and geophysical exploration prior to construction of the tunnel.

The outfall includes a 400-foot-deep (121-meter) onshore shaft at Deer Island and 55 riser shafts that connect the final section of the tunnel to diffuser caps in the deep waters of Massachusetts Bay.

In September 2000, the outfall began discharging twice-treated wastewater nine miles (15 kilometers) into Massachusetts Bay. “This is a major step in our effort to clean up Boston Harbor and to provide first-class recreational opportunities for our citizens and unpolluted habitat for our wildlife,” said the Massachusetts Secretary of Environmental Affairs.