Longfellow Bridge Rehabilitation Project
Tetra Tech provided traffic management and environmental permitting services for the Longfellow Bridge Rehabilitation Design-Build Project in Boston and Cambridge, Massachusetts. During construction of the iconic Longfellow Bridge over the Charles River Tetra Tech’s plans helped to maintain Massachusetts Bay Transportation Authority (MBTA) Redline train service and minimize impacts to the traveling public, local businesses, and the boating community.
The Longfellow Bridge carries 90,000 train passengers, as well as 30,000 vehicles, bicyclists and pedestrians daily between Boston and Cambridge. Our team developed plans to maintain access for all users as well as emergency vehicles, with sidewalks, bike lanes and one inbound (toward Boston) vehicle travel lane on the bridge at all times. Tetra Tech is responsible for traffic management during the six major construction phases and for designing temporary traffic control and monitoring at 40 adjacent traffic signals. Extensive detour plans allow for traffic movements around the Charles River Basin between Boston and Kendall Square, including MBTA buses during the 25 approved Redline shutdown weekends. Our firm is working closely with the Cities of Boston and Cambridge, and numerous stakeholder groups, to reduce construction impacts to bridge users. This includes extensive public meetings and stakeholder briefings.
In addition to traffic management services, Tetra Tech acted as environmental monitor, overseeing compliance with federal, state, and local environmental permits. We also developed a construction-term Stormwater Pollution Prevention Plan pursuant to the U.S. Environmental Protection Agency’s National Pollutant Discharge Elimination System (NPDES) General Permit for Discharges from Construction Activities.