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Central Artery/Tunnel Project

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This Mass Moment occurred in the Greater Boston region of Massachusetts.
 

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Central Artery Project Announced
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On This Day...
      ...in 1954, The Boston Globe announced the opening of the first elevated expressway in the United States. Hailed as an engineering marvel and a model of urban planning, the Central Artery incorporated the latest technology, including on and off ramps that could melt snow. Reporters predicted that a 25-minute commute would be reduced to a mere two minutes. But rave reviews soon turned to frustration, as the number of traffic jams and accidents skyrocketed. After years of mounting complaints, in 1983 Governor Michael Dukakis announced that the Central Artery would be disassembled and replaced with the country's first underground and underwater urban expressway. Twenty years and $15 billion later, the "Big Dig" nears completion.

The "Big Dig" — two little words that describe the largest urban construction project in the history of the modern world: to move the John Fitzgerald Expressway underground as it runs through the heart of Boston. Nearly eight miles long and as wide as 12 lanes under the center of the city, the Big Dig is a larger undertaking than the Panama Canal or the Hoover Dam. Remarkably, this is the second time the same stretch of road has made history.

At the turn of the twentieth century, traffic in Boston seemed hopelessly tangled. City officials tried to alleviate the problem by constructing the country's first subway, along with a state-of-the-art elevated railway system. The situation improved for pedestrians, but Boston's narrow, twisting streets were a nightmare for the growing number of automobiles. Drivers from outlying neighborhoods and the booming suburbs had to navigate a maze of local streets just to reach downtown, and business leaders worried that the center city would decline if workers — and, perhaps even more important, shoppers — could not access it easily by car.

As early as 1909 a commission recommended building a 100-foot wide road between South and North Stations. That proposal came to naught, but in the 1930s urban planners began to think about creating an elevated highway through the heart of Boston. The Depression and WW II put those plans on hold, but in 1949 William Callahan, the powerful Commissioner of Public Works, was determined to move forward. In 1951 construction began on the Central Artery.

When the elevated section of the road was completed in the summer of 1954, Mayor John B. Hynes exulted, "For 20 years we have dreamed and hoped for something like this."

The dream had a dark side. In its enthusiasm for the Artery, the city razed vibrant neighborhoods in the North End and Chinatown, displacing thousands of families. The completed roadway was not the graceful skyway that had been promised, but an ugly mass of green-painted steel and concrete that cut the city off from the waterfront. (Bostonians eventually labeled it the town's other "Green Monster.") Worst of all, too many on-and-off ramps, combined with higher than expected traffic, made the road one of the most accident-prone in the nation. Midway through construction, the plans were changed: the remainder of the highway would be built underground.

The full length of the artery finally opened to the public in 1959. Almost immediately people began to discuss depressing the whole road, but the cost and engineering challenges seemed insurmountable. When in 1956 the federal government agreed to fund 90% of highway projects, the issue moved to the front burner. It took nearly 30 years for all of the city's various interest groups to reach consensus. In September of 1983, Governor Dukakis announced plans for what came to be called the "Big Dig."

There were rough spots from the very beginning. While Fred Salvucci, the visionary state Secretary of Transportation, focused on resolving technical issues and local political conflicts, Senator Edward Kennedy orchestrated a one-vote override of President Reagan's veto of funding for the project. Once construction got underway in September 1991, the Big Dig team constantly had to devise innovative solutions to novel problems. For example, concerned that fish might be harmed by the use of explosives under the harbor, engineers designed a "fish startling system" that emitted sound waves to chase fish and lobsters away from blast zones.

The Big Dig was an engineering marvel. Its many triumphs included the world's largest slurry walls (concrete walls built from the surface to the bedrock to allow a discrete area to be excavated); transferring the weight of the elevated highway onto new supports while construction continued; tunneling 120 feet under the existing subway tracks; sinking and connecting pre-constructed sections of an underwater tunnel; and, perhaps most remarkable of all, keeping cars, trains, subways, pedestrians, and utilities running while completing the world's largest urban construction project.

The Big Dig will improve the flow of traffic through Boston, but there are other benefits as well. The project provided high wage jobs for over 15,000 people. Archaeology yielded fresh insight into prehistoric and early Boston. Utilities that had to be relocated were updated and now reside in streamlined, easy-to-maintain ducts. Spectacle Island, which received much of the fill from the project, was capped and developed into a 121-acre park. Nearly 30 acres of former Artery land has been designated the Rose Kennedy Greenway.

In 2003 the submerged Central Artery finally opened. It was years behind schedule and billions of dollars over budget, but Boston, the city that pioneered the elevated expressway, could now claim the nation's largest underground and underwater limited-access highway. However, even as the ribbons were being cut, controversy persisted about leaking tunnels, faulty design, poor management oversight, and cost overruns. In July 2006, tragedy struck when a section of tunnel ceiling collapsed, killing a Jamaica Plain resident.

Over the next few weeks, whole sections of the Central Artery were closed while workers tested and in many cases reinforced ceiling panels. Both state and federal agencies launched criminal investigations. As the Boston Globe reported,"with a Big Dig flaw now responsible for a death, . . . an unprecedented crisis of public confidence in the project" replaced the pride Bostonians had taken in the city's engineering miracle.

Sources

The Big Dig, by Dan McNichol (Silver Lining Books, 2002).

Highway to the Past: The Archaeology of Boston's Big Dig, ed. by Ann-Eliza H. Lewis (Secretary of the Commonwealth of Massachusetts, 2001).

The Boston Globe, "The Old Artery Got Job Done -- for a While," by Raphael Lewis, March 28, 2003.

The Boston Globe, Special Coverage, July 12 - August 2, 2006.


 
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