Dewey Square Tunnel
Encyclopedia
The Dewey Square Tunnel in Boston, Massachusetts, is part of Interstate 93
Interstate 93
Interstate 93 is an Interstate Highway in the New England section of the United States. Its southern terminus is in Canton, Massachusetts, in the Boston metropolitan area, at Interstate 95; its northern terminus is near St. Johnsbury, Vermont, at Interstate 91...

 (concurrent with US 1
U.S. Route 1
U.S. Route 1 is a major north–south U.S. Highway that serves the East Coast of the United States. It runs 2,377 miles from Fort Kent, Maine at the Canadian border south to Key West, Florida. U.S. 1 generally parallels Interstate 95, though it is significantly farther west between...

 and Route 3), running under the heart of the city's financial district, including Dewey Square
Dewey Square
Dewey Square is a square in downtown Boston, Massachusetts, USA. It lies at the intersection of Atlantic Avenue, Summer Street, Federal Street, Purchase Street and Surface Artery, with the Central Artery passing underneath in the Dewey Square Tunnel and Big Dig...

. Built in 1959, it was part of Boston's Central Artery
Central Artery
The John F. Fitzgerald Expressway, known locally as the Central Artery, is a section of freeway in downtown Boston, Massachusetts, designated as Interstate 93, U.S. Route 1 and Route 3. It was initially constructed in the 1950s as a partly elevated and partly tunneled divided highway...

 freeway construction project of the 1950s.

Known to locals as the South Station Tunnel (due to its proximity to the city's main train station), the Dewey Square Tunnel is of cut-and-cover design, and originally was six lanes wide (three in each direction), with no breakdown lanes. The Central Artery, elevated for most of its length, was so reviled because it cut off views of and access to Boston's historic waterfront. In later years, it was derisively called "the other Green Monster" by Mayor Thomas M. Menino (after the famous left-field wall
Green Monster
The Green Monster is a popular nickname for the thirty-seven foot , two-inch high left field wall at Fenway Park, home to the Boston Red Sox baseball team...

 at Fenway Park
Fenway Park
Fenway Park is a baseball park near Kenmore Square in Boston, Massachusetts. Located at 4 Yawkey Way, it has served as the home ballpark of the Boston Red Sox baseball club since it opened in 1912, and is the oldest Major League Baseball stadium currently in use. It is one of two "classic"...

 with the same nickname). Because of public outcry during construction in the late 1950s, it was decided by then-Governor John A. Volpe
John A. Volpe
John Anthony Volpe was the 61st and 63rd Governor of Massachusetts and a U.S. Secretary of Transportation.-Early life and education:Volpe was born in 1908 in Wakefield, Massachusetts. He was the son of Italian immigrants Vito and Filomena , who had come from Abruzzo to Boston's North End in 1905;...

 that the final section of the artery was to be put underground from just south of Congress Street to Kneeland Street near Boston's Chinatown section. At the time of its construction, it was the widest vehicular tunnel in the world.

At one time, a bus terminal serving Peter Pan
Peter Pan Bus Lines
Peter Pan Bus Lines is a long-distance bus carrier headquartered in Springfield, Massachusetts. It operates in the northeastern United States. Over four million passengers per year travel on Peter Pan's bus routes....

, Bonanza, and other regional bus lines sat atop the tunnel near its northern portal. That bus station has since been relocated to the major intermodal transportation hub at South Station
South Station
South Station, New England's second-largest transportation center , located at the intersection of Atlantic Avenue and Summer Street in Dewey Square, Boston, Massachusetts, is the largest train station and intercity bus terminal in Greater Boston, a prominent train station in the northeastern...

.

The lack of breakdown lanes, the limited number of travel lanes, and the myriad access ramps to and from the Artery and the tunnel caused massive traffic jams and gridlock, forcing transportation officials to consider rebuilding the Artery and putting it totally underground. The Dewey Square Tunnel received new life as part of the massive Big Dig project of the late 1990s and early 2000s. The tunnel was rehabilitated and now serves as exclusive southbound lanes of Interstate 93
Interstate 93
Interstate 93 is an Interstate Highway in the New England section of the United States. Its southern terminus is in Canton, Massachusetts, in the Boston metropolitan area, at Interstate 95; its northern terminus is near St. Johnsbury, Vermont, at Interstate 91...

, complete with a new ventilation system and gently banked corners consistent with appropriate superelevation. Its old northern portal at Congress Street was connected to the underground southbound lanes of the new artery in 2005.

A long-closed northbound off-ramp to Chinatown was rebuilt and reopened as a southbound on-ramp from Surface Road. The refurbished tunnel, with 6 lanes at its widest point, was fully opened on March 5, 2005. The Dewey Square Tunnel is the only remaining section of the original Central Artery still in use. Since the completion of the Big Dig project, the name "Dewey Square (South Station) Tunnel" has fallen into general disuse; instead, it is considered to be part of the Thomas P. O'Neill Jr. Tunnel
Thomas P. O'Neill Jr. Tunnel
The Thomas P. "Tip" O'Neill, Jr. Tunnel is a highway tunnel built as part of the Big Dig in Boston, Massachusetts. It carries the Central Artery underneath downtown Boston, and is numbered as Interstate 93, U.S. Route 1, and Route 3. It roughly follows the route of the old elevated Central Artery,...

, a name used for the entire length of the north-south tunnel system.
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