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99-612: The Big Dig was a megaproject in Boston that rerouted the then elevated Central Artery of Interstate 93 that cut across Boston into the O'Neill Tunnel and built the Ted Williams Tunnel to extend Interstate 90 to Logan International Airport . Those two projects were the origin of the official name, the Central Artery/Tunnel Project ( CA/T Project ). Additionally, the project constructed

198-559: A beltway roughly 15 miles (24 km) outside of Boston . While earlier plans called for I-95 to run northeastward through Boston along the Southwest Corridor and a more northerly portion of Route 1 known as the Northeast Expressway , these plans were squashed due to fierce community opposition. As such, Boston is one of only two major east coast cities that I-95 bypasses (the other, Washington DC , for

297-654: A Third Harbor Tunnel plan that was hugely controversial in its own right, because it would have disrupted the Maverick Square area of East Boston . It was never built. A major reason for the all-day congestion was that the Central Artery carried not only north–south traffic, but it also carried east–west traffic. Boston's Logan Airport lies across Boston Harbor in East Boston; and before the Big Dig,

396-650: A bust of shipbuilder Donald McKay in East Boston ; blue interior lighting of the Zakim Bridge; and the Miller's River Littoral Way walkway and lighting under the loop ramps north of the Charles River . Extensive landscape planting, as well as a maintenance program to support the plantings, was requested by many community members during public meetings. The Big Dig separated the co-mingled traffic from

495-472: A combined sum of approximately $ 51 million. This project was developed in response to traffic congestion on Boston's historically tangled streets which were laid out centuries before the advent of the automobile . As early as 1930, the city's Planning Board recommended a raised express highway running north–south through the downtown district in order to draw through traffic off the city streets. Commissioner of Public Works William Callahan promoted plans for

594-619: A fourth lane in each direction along Route 128/I-95 from the I-93 interchange in Canton to the Route ;9 interchange in Wellesley, where the rush-hour traffic has been for some time permitted to use the breakdown lanes on the highway shoulder. The section south of Route 9 was completed by late 2015, and the last section, from Needham to Wellesley, where construction started in 2015,

693-634: A high level of innovation and complexity, and are affected by a number of techno-socio-economic and organizational challenges. The OFCCP Mega Construction Project (Megaproject) Program involves projects valued at over $ 35 million. Megaprojects are often affected by corruption, leading to higher cost and lower benefit. According to the European Cooperation in Science and Technology (COST), megaprojects are characterized both by "extreme complexity (both in technical and human terms) and by

792-708: A long record of poor delivery". Megaprojects attract significant public attention because of substantial impacts on communities , environment , and budgets , and the high costs involved. Megaprojects can also be defined as "initiatives that are physical, very expensive, and public". Megaprojects include special economic zones , public buildings , power plants , dams , airports , hospitals , seaports , bridges , highways , tunnels , railways , wastewater projects, oil and natural gas extraction projects, aerospace projects, weapons systems , information technology systems, large-scale sporting events and, more recently, mixed use waterfront redevelopments; however,

891-595: A new interchange at Kendrick Street in Needham, designated as exit 35A (old exit 19A) with the ramps to Highland Avenue as exits 35B–C (old exits 19B–C). During the initial construction of I-95, a provision had already been made for a fourth lane within the widely spaced median along the 1.5-mile (2.4 km) length of I-95 running from just north of the US ;1 interchange in Dedham northwestward to

990-399: A number of state-of-the-art construction techniques. Because the old elevated highway (which remained in operation throughout the construction process) rested on pylons located throughout the designated dig area, engineers first utilized slurry wall techniques to create 120-foot-deep (37 m) concrete walls upon which the highway could rest. These concrete walls also stabilized the sides of

1089-401: A short portion of I-93, but additional lanes and direct connections are provided for this traffic. The result was a 62% reduction in vehicle hours of travel on I-93, the airport tunnels, and the connection from Storrow Drive, from an average 38,200 hours per day before construction (1994–1995) to 14,800 hours per day in 2004–2005, after the project was largely complete. The savings for travelers

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1188-509: A traditional cut-and-cover method had been applied. Other challenges included existing subway tunnels crossing the path of the underground highway. To build slurry walls past these tunnels, it was necessary to dig beneath the tunnels and to build an underground concrete bridge to support the tunnels' weight, without interrupting rail service. The project was managed by the Massachusetts Turnpike Authority, with

1287-471: A year by increasing economic productivity and decreasing motor vehicle operating costs. That study did not look at highways outside the Big Dig construction area and did not take into account new congestion elsewhere. Towards the end of the Big Dig in 2003, it was estimated that the demolition of the Central Artery highway would cause a $ 732 million increase in property value in Boston's financial district, with

1386-610: Is 65 mph (105 km/h). After leaving Route 128, I-95 expands to eight lanes and heads north through the less densely populated northeastern portion of the state hence why the speed limit increases to 65 mph from Peabody to the New Hampshire border crossing through more rural areas in northeastern Massachusetts, including Georgetown, Massachusetts , Rowley, Massachusetts , Newbury, Massachusetts and others in Salisbury. The sharp transition curve from I-95 north onto

1485-536: Is a southbound-only exit connecting to US 1 south into Rhode Island). Exits 4–7 (old exits 3–5) also serve the Attleboro area, with exit 6 (old exit 4) at the northern terminus of I-295 . Exits 12A and 12B (old exits 6A and 6B) in Mansfield provide access to I-495 , the "outer circumferential" beltway around Greater Boston . I-495 provides northbound connections to Worcester ,

1584-542: Is collective benefits; for example electricity for everybody (who can pay), road access (for those that have cars), etc. They may also serve as a means to open frontiers. Megaprojects have been criticised for their top-down planning processes and their ill effects on certain communities. Large scale projects often advantage one group of people while disadvantaging another, for instance, the Three Gorges Dam in China,

1683-787: Is often expressed by critics of megaprojects during the planning phase. If the megaproject is delivered in a country with relevant corruption the likelihood and magnitude of having overbudgets increases. One of the most challenging aspects of megaprojects is obtaining sufficient funding. Alan Altshuler and David Luberoff have found that creative and politically adept political leadership is required to secure resources as well as generate public support, mollify critics, and manage conflict through many years of planning, authorization and implementation. Other challenges faced by those planning megaprojects include laws and regulations that empower community groups, contested information and methodologies, high levels of uncertainty, avoiding impacts on neighborhoods and

1782-602: Is supported by two forked towers connected to the span by cables and girders. It was the first bridge in the country to employ this method and it was, at the time, the widest cable-stayed bridge in the world, having since been surpassed by the Eastern span replacement of the San Francisco–Oakland Bay Bridge . Meanwhile, construction continued on the Tobin Bridge approach. By the time all parties agreed on

1881-1025: Is the third-longest Interstate Highway in Massachusetts , behind I-90 (the Massachusetts Turnpike ) and I-495 , while I-95 in full is the longest north–south Interstate and sixth-longest Interstate Highway in the US . Its southern terminus within the state is located in Attleboro , where I-95 enters from Pawtucket, Rhode Island . It intersects with US Route 1 (US 1) and the northern terminus of I-295 within Attleboro, I-495 in Mansfield , and US 1 in Sharon before arriving at an interchange with I-93 , US 1, and Route 128 in Canton . At this interchange, I-95 begins running concurrently with US 1 and Route 128 along

1980-751: The American Recovery and Reinvestment Act of 2009 . Nashua Street Park on the Boston side was completed in 2003, by McCourt Construction with $ 7.9 million in funding from MassDOT. As of 2017, $ 30.5 million had been transferred to the Massachusetts Department of Conservation and Recreation to complete five projects. Another incomplete but required project is the South Bank Bridge over the MBTA Commuter Rail tracks at North Station (connecting Nashua Street Park to

2079-540: The Charles River crossing had been a source of major controversy throughout the design phase of the project. Many environmental advocates preferred a river crossing entirely in tunnels, but this, along with 27 other plans, was rejected as too costly. Finally, with a deadline looming to begin construction on a separate project that would connect the Tobin Bridge to the Charles River crossing, Salvucci overrode

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2178-790: The Charles River Dam and lock, a maintenance facility, and a planned pedestrian walkway across the Charles River next to the MBTA Commuter Rail drawbridge at North Station (connecting Nashua Street Park and North Point Park). MassDOT is funding the South Bank Park, and replacement of the North Washington Street Bridge (construction Aug 2018–23). EF Education is funding public greenspace improvements as part of its three-phase expansion at North Point. Remaining funding may be used to construct

2277-634: The Lowell – Nashua, New Hampshire , metro area. Access to the Middlesex Turnpike and Burlington retail district is facilitated at this interchange as well. US 3 south briefly joins the freeway in another wrong-way multiplex in order to connect with its old alignment, leaving at exit 51A (old exit 33A). I-95 and Route 128 continue northeast through the city of Woburn and into Reading . In Reading, I-95 and Route 128 once again have an interchange with I-93. After crossing I-93,

2376-746: The Massachusetts Department of Transportation (MassDOT) was the segment from Saugus to the Massachusetts Avenue Connector in Roxbury. The Southwest Expressway and the Inner Belt highways were among the Sargent-canceled highways. Between 1972 and 1974, plans were to extend I-95 along a northerly extension of the Northeast Expressway to Route 128 in northwestern Danvers . During this time, I-95

2475-710: The Massachusetts Turnpike , and the western part of the state, and southbound connections to Cape Cod . Mansfield is home to the Xfinity Center , a Live Nation Entertainment -owned amphitheater that hosts numerous concert events, and TPC Boston , a PGA Tour player's club that hosted the Dell Technologies Championship yearly. The two venues are located near I-95's interchanges with Route 140 . I-95 continues northward into Foxborough , home of Gillette Stadium , located on US 1 and accessible from exit 19 (old exit 9). As

2574-519: The Massachusetts Turnpike /I-90, and connecting with the Northeast Expressway at the Charlestown banks of the Charles River . However, due to pressure from local residents, all proposed Interstate Highways within Route ;128 were canceled in 1972 by Governor Francis Sargent with the exception of I-93 to Boston. The only section of I-95 completed within the Route 128 beltway by

2673-708: The New Hampshire state line, a Y interchange that merges I-495 onto I-95. Northbound access to I-495 south is possible via exit 58 for Route 110 westbound, which leads to I-495's exit 119 (old exit 55) (I-495's last northbound exit before I-95). The northernmost exit in Massachusetts is exit 90 (old exit 60), providing access to Main Street toward Amesbury and Route 286 toward Salisbury Beach and Hampton Beach (the southbound ramp starts in New Hampshire). After crossing underneath

2772-599: The North-South Rail Link , which would have connected North and South Stations (the major passenger train stations in Boston), but this aspect of the project was ultimately dropped by the state transportation administration early in the Dukakis administration. Negotiations with the federal government had led to an agreement to widen some of the lanes in the new harbor tunnel, and accommodating these would require

2871-623: The Red and Blue subway lines, and to restore the Green Line streetcar service to the Arborway in Jamaica Plain have not been completed. The Red and Blue subway line connection underwent initial design, but no funding has been designated for the project. The Arborway Line restoration has been abandoned, following a final court decision in 2011. The original Big Dig plan also included

2970-574: The Zakim Bunker Hill Bridge over the Charles River , created the Rose Kennedy Greenway in the space vacated by the previous I-93 elevated roadway, and funded more than a dozen projects to improve the region's public transportation system. Planning for the project began in 1982; the construction work was carried out between 1991 and 2006; and the project concluded on December 31, 2007. The project's general contractor

3069-497: The 14.3-mile (23.0 km), six-lane section of highway to eight lanes from north of Route 9 in Wellesley to Route 24 in Randolph. The project consisted of adding a lane on the inside of each carriageway, complete with a 10-foot (3.0 m) inside shoulder. The existing 1950s bridges, 22 in total, were replaced. The project included construction of a new two-lane ramp from Route 128 to I-95 in Canton and installation of

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3168-480: The Artery Arts Program was seen as a potential liability, even though there was support and interest from the public and professional arts organizations in the area. At the beginning of the highway design process, a temporary arts program was initiated, and over 50 proposals were selected. However, development began on only a few projects before funding for the program was cut. Permanent public art that

3267-535: The Big Dig and the Turnpike's Boston Extension from the 1960s being financially and legally joined by the legislature as the Metropolitan Highway System . Design and construction was supervised by a joint venture of Bechtel Corporation and Parsons Brinckerhoff . Because of the enormous size of the project—too large for any company to undertake alone—the design and construction of the Big Dig

3366-647: The Big Dig was passed by the US Congress , but it was vetoed by President Ronald Reagan for being too expensive. When Congress overrode the veto, the project had its green light and ground was first broken in 1991. In 1997, the state legislature created the Metropolitan Highway System and transferred responsibility for the Central Artery and Tunnel "CA/T" Project from the Massachusetts Highway Department and

3465-642: The Big Dig. The most expensive was the building of the Phase II Silver Line tunnel under Fort Point Channel , done in coordination with Big Dig construction. Silver Line buses now use this tunnel and the Ted Williams Tunnel to link South Station and Logan Airport. Construction of the MBTA Green Line extension beyond Lechmere to Medford/Tufts station opened on December 12, 2022. As of 2023, promised projects to connect

3564-552: The Central Artery became chronically gridlocked. The Sargent moratorium led to the rerouting of I-95 away from Boston around the Route 128 beltway and the conversion of the cleared land in the southern part of the city into the Southwest Corridor linear park , as well as a new right-of-way for the Orange Line subway and Amtrak . Parts of the planned I-695 right-of-way remain unused and under consideration for future mass-transit projects. The original 1948 Master Plan included

3663-484: The Central Artery, an elevated expressway which eventually was constructed between the downtown area and the waterfront. Governor John Volpe interceded in the 1950s to change the design of the last section of the Central Artery, putting it underground through the Dewey Square Tunnel . While traffic moved somewhat better, the other problems remained. There was chronic congestion on the Central Artery (I-93),

3762-658: The I-93 design, construction of the Tobin connector (today known as the "City Square Tunnel" for a Charlestown area it bypasses) was far along, significantly adding to the cost of constructing the US Route 1 interchange and retrofitting the tunnel. Boston blue clay and other soils extracted from the path of the tunnel were used to cap many local landfills , fill in the Granite Rail Quarry in Quincy , and restore

3861-471: The Inner Belt, was subsequently renamed Interstate 695 . (The law establishing the Interstate highway system was enacted in 1956.) The Inner Belt District was to pass to the west of the downtown core, through the neighborhood of Roxbury and the cities of Brookline , Cambridge , and Somerville . Earlier controversies over impact of the Boston extension of the Massachusetts Turnpike , particularly on

3960-505: The Interstate continues through Sharon , it then enters Greater Boston and the towns of Walpole , and Norwood , before entering Canton , where it meets I-93 at its southern terminus, and I-93 continues as exit 26 (old exit 12) to the right of I-95, while I-95 traffic is routed in a single lane to a sharp clockwise curve where it meets US 1 in a wrong-way concurrency . Upon interchanging with I-93, I-95 loops around to

4059-453: The MTA's representative. Eventually, MTA combined some of its employees with joint venture employees in an integrated project organization. This was intended to make management more efficient, but it hindered MTA's ability to independently oversee project activities because MTA and the joint venture had effectively become partners in the project. In addition to political and financial difficulties,

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4158-543: The Massachusetts Governor's Office to the Massachusetts Turnpike Authority (MTA). The MTA, which had little experience in managing an undertaking of the scope and magnitude of the CA/T Project, hired a joint venture to provide preliminary designs, manage design consultants and construction contractors, track the project's cost and schedule, advise MTA on project decisions, and (in some instances) act as

4257-673: The Massachusetts Turnpike and the Sumner and Callahan tunnels. While only one net lane in each direction was added to the north–south I-93, several new east–west lanes became available. East–west traffic on the Massachusetts Turnpike/I-90 now proceeds directly through the Ted Williams Tunnel to Logan Airport and Route 1A beyond. Traffic between Storrow Drive and the Callahan and Sumner Tunnels still uses

4356-729: The New Hampshire border in Salisbury, Massachusetts . The original plans called for I-95 to run through downtown Boston . The highway would have progressed from Route 128 and Readville , followed the Southwest Corridor , ran along Melnea Cass Boulevard in Roxbury , heading east, and joining the Southeast Expressway at South Bay, then north to the Central Artery at the South Station interchange with

4455-522: The North Point Inlet pedestrian bridge, and a pedestrian walkway over Leverett Circle . Before being replaced with surface access during the reconstruction of the Science Park MBTA Green Line station, Leverett Circle had pedestrian bridges with stairs that provided elevated access between the station, the Charles River Parks, and the sidewalk to the Boston Museum of Science . The replacement ramps would comply with Americans with Disabilities Act requirements and allow easy travel by wheelchair or bicycle over

4554-487: The Route 109 interchange, and this will finally be used for the Add-A-Lane project. Construction on phase 1 was officially completed in October 2009. Construction of phase 2 of the project began in mid-2006. This phase of the project consisted of the replacement of the US 1 and Route 1A bridges over I-95 in Dedham along with the road widening between exits 27, 29A, and 29B (old exits 13, 15A, and 15B). Construction of four sound barriers between

4653-419: The Route 128 beltway in Canton is posted for 25 mph (40 km/h). Along the beltway, the speed limit is 55 mph (89 km/h), and the speed limit on the transition ramps at exit 64 (old exit 45) at the I-95/Route 128 split in Peabody is 45 mph (72 km/h) northbound and 50 mph (80 km/h) southbound before increasing to 65 mph from that point on until it reaches

4752-420: The United States and Germany prevented developments due to environmental and social concerns. More recently, new types of megaprojects have been identified that no longer follow the old models of being singular and monolithic in their purposes, but have become quite flexible and diverse, such as waterfront redevelopment schemes that seem to offer something to everybody. However, just like the old megaprojects,

4851-459: The busy intersection. While not a legally mandated requirement, public art was part of the urban design planning process (and later design development work) through the Artery Arts Program. The intent of the program was to integrate public art into highway infrastructure (retaining walls, fences, and lighting) and the essential elements of the pedestrian environment (walkways, park landscape elements, and bridges). As overall project costs increased,

4950-409: The circle. All southbound lanes of I-93 opened to traffic on March 5, 2005, including the left lane of the Zakim Bridge, and all of the refurbished Dewey Square Tunnel . By the end of December 2004, 95% of the Big Dig was completed. Major construction remained on the surface, including construction of final ramp configurations in the North End and in the South Bay interchange, and reconstruction of

5049-451: The city, not reduced or eliminated (although some trips are now faster). The report states, "Ultimately, many motorists going to and from the suburbs at peak rush hours are spending more time stuck in traffic, not less." The Globe also asserted that their analysis provides a fuller picture of the traffic situation than a state-commissioned study done two years earlier, in which the Big Dig was credited with helping to save at least $ 167 million

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5148-411: The connecting roads, I-95 crosses the state line into Seabrook, New Hampshire . This is a list of rest areas on I-95 in Massachusetts: Weigh stations are located on the northbound and southbound sides of the highway at the following locations: Between the Rhode Island state line and I-93 in Canton, and again between the northern end of the beltway and the New Hampshire state line, the speed limit

5247-590: The decades passed and other planned expressways were cancelled, continually escalating vehicular traffic that was well beyond its design capacity. Local businesses again wanted relief, city leaders sought a reuniting of the waterfront with the city, and nearby residents desired removal of the matte green-painted elevated road which mayor Thomas Menino called Boston's "other Green Monster " (as an unfavorable comparison to Fenway Park 's famed left-field wall). MIT engineers Bill Reynolds and (eventual state Secretary of Transportation) Frederick P. Salvucci envisioned moving

5346-400: The eastbound lanes on January 19. The next phase, moving the elevated Interstate 93 underground, was completed in two stages: northbound lanes opened on March 29, 2003, and southbound lanes (in a temporary configuration) on December 20, 2003. A tunnel underneath Leverett Circle connecting eastbound Storrow Drive to I-93 North and the Tobin Bridge opened December 19, 2004, easing congestion at

5445-522: The elevated six-lane highway through the center of downtown Boston, which was, in the words of Pete Sigmund, "like a funnel full of slowly-moving, or stopped, cars (and swearing motorists)." In 1959, the 1.5-mile-long (2.4 km) road section carried approximately 75,000 vehicles a day, but by the 1990s, this had grown to 190,000 vehicles a day. Traffic jams of 16 hours were predicted for 2010. The expressway had tight turns, an excessive number of entrances and exits, entrance ramps without merge lanes, and as

5544-401: The environment, and attempting to solve a wicked problem . Interstate 95 in Massachusetts Interstate 95 ( I-95 ) is a part of the Interstate Highway System that parallels the East Coast of the United States from Miami, Florida , in the south to Houlton, Maine , in the north. In the US state of Massachusetts, it spans 92 miles (148 km) along a north–south axis. It

5643-433: The excavation and the possibility of disrupting the homes of millions of rats , causing them to roam the streets of Boston in search of new housing. By the time the federal environmental clearances were delivered in 1994, the process had taken some seven years, during which time inflation greatly increased the project's original cost estimates. Reworking such a busy corridor without seriously restricting traffic flow required

5742-450: The excavation to take place below. Construction crews also used ground freezing (an artificial induction of permafrost ) to help stabilize surrounding ground as they excavated the tunnel. This was the largest tunneling project undertaken beneath railroad lines anywhere in the world. The ground freezing enabled safer, more efficient excavation , and also assisted in environmental issues, as less contaminated fill needed to be exported than if

5841-471: The freeway has an interchange with Route 9 , and the freeway widens to eight lanes. Then, the highway passes through Newton , then enters Weston and has a large interchange with the Massachusetts Turnpike (I-90) that provides connections to nearby Route 30 . With the exception of between the I-90 on- and offramps, this portion of I-95 is four lanes in each direction. I-95 and Route 128 are due west of Boston at this point and begin to turn to

5940-457: The general economy has been a popular policy measure since the economic crisis of the 1930s. Recent examples are the 2008–2009 Chinese economic stimulus program , the 2008 European Union stimulus plan , and the American Recovery and Reinvestment Act of 2009 . Megaprojects often raise capital based on expected returns—though projects often go overbudget and over time, and market conditions like commodity prices can change. Concern at cost overruns

6039-513: The heavily populated neighborhood of Brighton , and the additional large amount of housing that would have had to be destroyed led to massive community opposition to both the Inner Belt and the Boston section of I-95. By 1970, building demolition and land clearances had been completed along the I-95 right of way through the neighborhoods of Roxbury, Jamaica Plain , the South End and Roslindale , which led to secession threats by Hyde Park , Boston's youngest and southernmost neighborhood (which I-95

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6138-526: The impact of the Central Artery/Tunnel Project on the community, representing the neighborhoods to government agencies, keeping the community informed, developing a list of priorities of immediate neighborhood concerns, and promoting responsible and appropriate development of the post-construction artery corridor in the North End and Waterfront neighborhoods. The political, financial and residential obstacles were magnified when several environmental and engineering obstacles occurred. The downtown area through which

6237-436: The largest hydroelectric project in the world, required the displacement of 1.2 million farmers. In the 1970s, the highway revolts in some Western nations saw urban activists opposing government plans to demolish buildings for freeway route construction, on the basis that such demolitions would unfairly disadvantage the urban working class and benefit commuters. Anti-nuclear protests against proposed nuclear power plants in

6336-454: The mainline roadway. The Connector ultimately used a pair of ramps that had been constructed for Interstate 695 , enabling the mainline I-93 to carry more traffic that would have used I-695 under the original Master Plan. When construction began, the project cost, including the Charles River crossing, was estimated at $ 5.8 billion. Eventual cost overruns were so high that the chairman of the Massachusetts Turnpike Authority, James Kerasiotes ,

6435-428: The most common megaprojects are in the categories of hydroelectric facilities, nuclear power plants, and large public transportation projects. Megaprojects can also include large-scale high-cost initiatives in scientific research and infrastructure, such as the sequencing of the human genome , a significant global advance in genetics and biotechnology . The logic on which many of the typical megaprojects are built

6534-594: The new ones also foreclose "upon a wide variety of social practices, reproducing rather than resolving urban inequality and disenfranchisement". Because of their plethora of land uses "these mega-projects inhibit the growth of oppositional and contestational practices". The collective benefits that are often the underlying logic of a mega-project, are here reduced to an individualized form of public benefit. Proponents of infrastructure-based development advocate for funding large-scale projects to create long-term economic benefits. Investing in megaprojects in order to stimulate

6633-414: The northeast, serving the city of Waltham and the town of Lexington along the way. The freeway has an interchange with Route 2 (Concord Turnpike) at exit 45 (old exit 29). Upon entering the town of Burlington , I-95 and Route 128 have an interchange with US 3 , the Northwestern Expressway, at exit 50A (old exit 32A). US 3 provides a direct freeway connection with

6732-411: The northern terminus of I-495 and arrives at its own northern terminus, where I-95 continues into Seabrook, New Hampshire , as the Blue Star Turnpike . I-95 crosses the state border from Pawtucket, Rhode Island , into Attleboro as a six-lane highway, with the first northbound exits, 2A and 2B, providing access to Route 1A and nearby US 1 near the border. (There is an exit 1, but it

6831-507: The now six-lane highway continues to the northeast, serving the towns of Wakefield , Lynnfield , and Lynn before crossing into Peabody , where Route 128 leaves I-95 at exit 64 (old exit 45) via the three left-most lanes as its own freeway toward Gloucester , while I-95 continues as the two right-most lanes in a somewhat sharp counterclockwise (albeit the fact that it contains two lanes) loop. After leaving Route 128, I-95 expands back to six lanes and then to eight lanes at

6930-435: The objections and chose a variant of the plan known as "Scheme Z". This plan was considered to be reasonably cost-effective, but had the drawback of requiring highway ramps stacked up as high as 100 feet (30 m) immediately adjacent to the Charles River. The city of Cambridge objected to the visual impact of the chosen Charles River crossing design. The city sued to revoke the project's environmental certificate and forced

7029-502: The only access to the airport from downtown was through the paired Callahan and Sumner tunnels. Traffic on the major highways from west of Boston—the Massachusetts Turnpike and Storrow Drive —mostly traveled on portions of the Central Artery to reach these tunnels. Getting between the Central Artery and the tunnels involved short diversions onto city streets, increasing local congestion. A number of public transportation projects were included as part of an environmental mitigation for

7128-474: The opening ceremony was held for the I-90 Connector Tunnel, extending the Massachusetts Turnpike (Interstate 90) east into the Ted Williams Tunnel , and onwards to Boston Logan International Airport . The Ted Williams tunnel had been completed and was in limited use for commercial traffic and high-occupancy vehicles since late 1995. The westbound lanes opened on the afternoon of January 18 and

7227-597: The original project plan were dropped due to the massive cost overruns on the highway portion of the project. $ 99.1 million was allocated for mitigating improvements to the Charles River Basin , including the construction of North Point Park in Cambridge and Paul Revere Park in Charlestown. The North Bank Bridge, providing pedestrian and bicycle connectivity between the parks, was not funded until

7326-548: The partial interchange with US 1 (exit 66, old exit 46) about one mile (1.6 km) north of Route 128 and heads north through the less densely populated northeastern portion of the state. The freeway serves the communities of Danvers , Boxford , Topsfield , Georgetown , Rowley , Newbury , West Newbury , Newburyport , Amesbury , and Salisbury . Traffic density is generally low on this 25-mile (40 km) stretch of freeway. I-495 has its northern terminus at I-95 exit 89 (old exit 59) just south of

7425-624: The perimeter highway (Route 128), and I-93 was extended to meet I-95 in Canton. For several decades, plans for the abandoned roadways could still be seen going from the end of the Northeast Expressway to the Saugus River in Saugus in the form of a graded but unpaved roadbed. Much of this was removed during the early 2000s. At the US 1/Route 60 interchange, one can still see unused bridges and ghost ramps that were originally intended to carry I-95. MassDOT's Add-A-Lane project added

7524-492: The project planners to redesign the river crossing again. Swiss engineer Christian Menn took over the design of the bridge. He suggested a cradle cable-stayed bridge that would carry ten lanes of traffic. The plan was accepted and construction began on the Leonard P. Zakim Bunker Hill Memorial Bridge . The bridge employed an asymmetrical design and a hybrid of steel and concrete was used to construct it. The distinctive bridge

7623-615: The project received resistance from residents of Boston's historic North End, who in the 1950s had seen 20% of the neighborhood's businesses displaced by development of the Central Artery. In 1993, the North End Waterfront Central Artery Committee (NEWCAC) created, co-founded by Nancy Caruso, representing residents, businesses, and institutions in the North End and Waterfront neighborhoods of Boston. The NEWCAC Committee's goal included lessening

7722-595: The proposed South Bank Park, which is currently a parking lot under the Zakim Bridge at the Charles River locks). Improvements in the lower Charles River Basin include the new walkway at Lovejoy Wharf (constructed by the developer of 160 North Washington Street, the new headquarters of Converse ), the Lynch Family Skate Park (constructed in 2015 by the Charles River Conservancy), rehabilitation of historic operations buildings for

7821-602: The replacement parks providing an additional $ 252 million in value. Additionally, as a result of the Big Dig, a large amount of waterfront space was opened up, which is now a high-rent residential and commercial area called the Seaport District . The development of Seaport alone was estimated to create $ 7 billion in private investment and 43,000 jobs. Megaproject Megaprojects refer not only to construction projects but also decommissioning projects, which are projects that can reach multi-billion budgets, and have

7920-1073: The same reason). While its concurrency with US 1 ends in Dedham , its concurrency with Route 128 continues as it meets with expressways including the Massachusetts Turnpike in Weston , US 20 in Waltham , Route 2 in Lexington , US 3 in Burlington (with which it runs concurrently within the town), and I-93 and US 1 in Reading and Lynnfield , respectively. I-95 and Route 128 split in Peabody , as Route 128 travels northeast toward its northern terminus in Gloucester , I-95 continues north and crosses US 1 in Peabody and Danvers . Within Salisbury , it intersects

8019-422: The site, preventing cave-ins during the continued excavation process. The multi-lane Interstate highway also had to pass under South Station 's seven railroad tracks, which carried over 40,000 commuters and 400 trains per day. To avoid multiple relocations of train lines while the tunneling advanced, as had been initially planned, a specially designed jack was constructed to support the ground and tracks to allow

8118-681: The surface of Spectacle Island in the Boston Harbor Islands National Recreation Area . The Storrow Drive Connector , a companion bridge to the Zakim, began carrying traffic from I-93 to Storrow Drive in 1999. The project had been under consideration for years, but was opposed by the wealthy residents of the Beacon Hill neighborhood. However, it finally was accepted because it would funnel traffic bound for Storrow Drive and downtown Boston away from

8217-522: The surface streets. The final ramp downtown—exit 16A (formerly 20B) from I-93 south to Albany Street —opened January 13, 2006. In 2006, the two Interstate 93 tunnels were dedicated as the Thomas P. O'Neill Jr. Tunnel , after the former Democratic speaker of the House of Representatives from Massachusetts who pushed to have the Big Dig funded by the federal government. The Commonwealth of Massachusetts

8316-501: The tunnel to be deeper and mechanically vented; this left no room for the rail lines, and having diesel trains (then in use) passing through the tunnel would have substantially increased the cost of the ventilation system. The project was conceived in the 1970s by the Boston Transportation Planning Review to replace the rusting elevated six-lane Central Artery. The expressway separated downtown from

8415-515: The tunnel without endangering the existing elevated highway above. Eventually, they created horizontal braces as wide as the tunnel, then cut away the elevated highway's struts, and lowered it onto the new braces. Three alternative construction methods were studied with their corresponding structural design to address existing conditions, safety measures, and constructability. In addition to codified loads, construction loads were computed to support final design and field execution . On January 18, 2003,

8514-542: The tunnels were to be dug was largely land fill , and included existing Red Line and Blue Line subway tunnels as well as innumerable pipes and utility lines that would have to be replaced or moved. Tunnel workers encountered many unexpected geological and archaeological barriers, ranging from glacial debris to foundations of buried houses and a number of sunken ships lying within the reclaimed land. The project received approval from state environmental agencies in 1991, after satisfying concerns including release of toxins by

8613-415: The waterfront, and was increasingly choked with bumper-to-bumper traffic. Business leaders were more concerned about access to Logan Airport , and pushed instead for a third harbor tunnel. Planning for the Big Dig as a project officially began in 1982, with environmental impact studies starting in 1983. After years of extensive lobbying for federal dollars, a 1987 public works bill appropriating funding for

8712-413: The west, taking over the roadbed from I-93 (now four lanes) and joining US 1 southbound in a wrong-way concurrency. Route 128 begins here as well. The highway enters Westwood next, with US 1 leaving the freeway near the Dedham town line to parallel I-95 back to the south. I-95 and Route 128 makes its way around Greater Boston, passing through Dedham, Needham , and Wellesley , where

8811-484: The whole expressway underground. Another important motivation for the final form of the Big Dig was the abandonment of the Massachusetts Department of Public Works' intended expressway system through and around Boston. The Central Artery, as part of Mass. DPW's Master Plan of 1948, was originally planned to be the downtown Boston stretch of Interstate 95 , and was signed as such; a bypass road called

8910-572: Was Bechtel and Parsons Brinckerhoff was the engineer, who worked as a consortium, both overseen by the Massachusetts Highway Department . The Big Dig was the most expensive highway project in the United States, and was plagued by cost overruns , delays, leaks, design flaws, accusations of poor execution and use of substandard materials, criminal charges and arrests, and the death of one motorist. The project

9009-518: Was also slated to go through). By 1972, with relatively little work done on the Southwest Corridor portion of I-95 and none on the potentially massively disruptive Inner Belt, Governor Francis Sargent put a moratorium on highway construction within the Route 128 corridor, except for the final short stretch of Interstate 93. In 1974, the remainder of the Master Plan was canceled. With ever-increasing traffic volumes funneled onto I-93 alone,

9108-515: Was broken up into dozens of smaller subprojects with well-defined interfaces between contractors. Major heavy-construction contractors on the project included Jay Cashman , Modern Continental , Obayashi Corporation , Perini Corporation , Peter Kiewit Sons' Incorporated , J. F. White , and the Slattery division of Skanska USA. (Of those, Modern Continental was awarded the greatest gross value of contracts, joint ventures included.) The nature of

9207-655: Was completed in 2019. Outside of Route 128, the state began a $ 285-million (equivalent to $ 341 million in 2023 ) project in 2012 to replace the John Greenleaf Whittier Bridge over the Merrimack River which included widening the highway to eight lanes (four in each direction) from the bridge to I-495. This project was substantially completed, and the full eight lanes opened in mid-2018. The $ 315-million (equivalent to $ 421 million in 2023 ) MassDOT Highway Division project widened

9306-441: Was estimated at $ 166 million annually in the same 2004–2005 time frame. Travel times on the Central Artery northbound during the afternoon peak hour were reduced 85.6%. A 2008 Boston Globe report asserted that waiting time for the majority of trips actually increased as a result of demand induced by the increased road capacity. Because more drivers were opting to use the new roads, traffic bottlenecks were only pushed outward from

9405-403: Was fired in 2000. His replacement had to commit to an $ 8.55 billion cap on federal contributions. The total expenses eventually passed $ 15 billion. Interest brought this cost to $ 21.93 billion. Several unusual engineering challenges arose during the project, requiring unusual solutions and methods to address them. At the beginning of the project, engineers had to figure out the safest way to build

9504-407: Was funded includes: super graphic text and facades of former West End houses cast into the concrete elevated highway abutment support walls near North Station by artist Sheila Levrant de Bretteville ; Harbor Fog, a sensor-activated mist, light and sound sculptural environment by artist Ross Miller in parcel 17; a historical sculpture celebrating the 18th and 19th century shipbuilding industry and

9603-430: Was officially routed along Route 128 from Canton to Braintree and north along the Southeast Expressway (also designated Route 3 ), from Braintree to Boston, then following the Central Artery, and continuing along the Northeast Expressway in Boston, Chelsea, and Revere. When the Northeast Expressway extension (between Saugus and Danvers) was canceled in 1974, I-95's route shifted to its current routing along

9702-625: Was originally scheduled to be completed in 1998 at an estimated cost of $ 2.8 billion (US$ 7.4 billion adjusted for inflation as of 2020). However, the project was completed in December 2007 at a cost of over $ 8.08 billion (in 1982 dollars, $ 21.5 billion adjusted for inflation), a cost overrun of about 190%. As a result of a death, leaks, and other design flaws, the Parsons Brinckerhoff and Bechtel consortium agreed to pay $ 407 million in restitution and several smaller companies agreed to pay

9801-613: Was required under the Federal Clean Air Act to mitigate air pollution generated by the highway improvements. Secretary of Transportation Fred Salvucci signed an agreement with the Conservation Law Foundation in 1990 enumerating 14 specific projects the state agreed to build. This list was affirmed in a 1992 lawsuit settlement. Projects which have been completed include: However, some projects were removed: Some surface treatments that were part of

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