The South Bay Interchange is a massive

interchange Interchange may refer to: Transport * Interchange (road), a collection of ramps, exits, and entrances between two or more highways * Interchange (freight rail), the transfer of freight cars between railroad companies * Interchange station, a rai ...

in downtown

Boston, Massachusetts Boston is the capital and most populous city in the Commonwealth (U.S. state), Commonwealth of Massachusetts in the United States. The city serves as the cultural and Financial centre, financial center of New England, a region of the Northeas ...

, in the US. The interchange consists of

Interstate 90 Interstate 90 (I-90) is an east–west transcontinental freeway and the longest Interstate Highway in the United States at . It begins in Seattle, Washington, and travels through the Pacific Northwest, Mountain states, Mountain West, Great Pla ...

, the Mass Pike Extension, and the

Interstate 93 Interstate 93 (I-93) is an Interstate Highway in the New England states of Massachusetts, New Hampshire, and Vermont in the United States. Spanning approximately along a north–south axis, it is one of three primary Interstate Highways ...

concurrency Concurrent means happening at the same time. Concurrency, concurrent, or concurrence may refer to: Law * Concurrence, in jurisprudence, the need to prove both ''actus reus'' and ''mens rea'' * Concurring opinion (also called a "concurrence"), a ...

with

US 1 U.S. Route 1 or U.S. Highway 1 (US 1) is a major north–south United States Numbered Highway System, United States Numbered Highway that serves the East Coast of the United States. It runs from Key West, Florida, north to Fort ...

and MA 3 south of the Thomas P. O'Neill Jr. Tunnel. The interchange dominates the South Bay parcel, a 10-acre (40,000 m²) site between

Chinatown Chinatown ( zh, t=唐人街) is the catch-all name for an ethnic enclave of Chinese people located outside Greater China, most often in an urban setting. Areas known as "Chinatown" exist throughout the world, including Europe, Asia, Africa, O ...

and the Leather District. It is roughly bounded by Kneeland Street, Hudson Street, the

Massachusetts Turnpike The Massachusetts Turnpike (colloquially the "Mass Pike" or "the Pike") is a controlled-access toll road that runs concurrently with Interstate 90 (I-90) in the U.S. state of Massachusetts. It the longest Interstate Highway in Massachu ...

mainline, and the

mainline. Currently owned by the

Massachusetts Department of Transportation The Massachusetts Department of Transportation (MassDOT) oversees roads, public transit, aeronautics, and transportation licensing and registration in the US state of Massachusetts. It was created on November 1, 2009, by the 186th Sessio ...

(MassDOT), the area is taken up by a major highway interchange between 90, 93, and local streets. There were original plans to re-develop the area with a office tower, but no such project has taken place.

History of the site

The South Bay parcel, as well as the adjacent

and Leather District neighborhoods, sit on filled land. Once part of South Cove, a portion of Boston's South Bay, it was filled in 1833 by the South Cove Corporation, who built an intermodal train/sea station as part of the

Boston and Worcester Railroad The Boston and Albany Railroad was a railroad connecting Boston, Massachusetts to Albany, New York, later becoming part of the New York Central Railroad system, Conrail, and CSX Transportation. The mainline is currently used by CSX for freight a ...

. This development included residential and commercial area, and what was considered at the time to be the largest hotel in the United States. Throughout most of the 19th century and the early half of the 20th century, the district was made up of

rail yard A rail yard, railway yard, railroad yard (US) or simply yard, is a series of Track (rail transport), tracks in a rail network for storing, sorting, or loading and unloading rail vehicles and locomotives. Yards have many tracks in parallel for k ...

s serving

railroad Rail transport (also known as train transport) is a means of transport using wheeled vehicles running in railway track, tracks, which usually consist of two parallel steel railway track, rails. Rail transport is one of the two primary means of ...

s entering Boston from the south and west. The rail yards and terminus attracted leather and garment businesses, which constructed the commercial buildings in the adjacent Leather District. Similarly, the railroad served as an immigrant gateway, a role which it played beginning in the late 19th century for many Asian newcomers, particularly Chinese. In the 1950s, the Massachusetts Highway Department displaced much of the rail yards to build the John F. Fitzgerald Expressway (the Central Artery). Later the ''South Bay interchange'' connected the Central Artery to the Massachusetts Turnpike. The intersection has since been reconstructed by the Big Dig, with

tunnels A tunnel is an underground or undersea passageway. It is dug through surrounding soil, earth or rock, or laid under water, and is usually completely enclosed except for the two portals common at each end, though there may be access and ve ...

to South Boston and

Logan Airport General Edward Lawrence Logan International Airport — also known as Boston Logan International Airport — is an international airport located mostly in East Boston and partially in Winthrop, Massachusetts, United States. Covering , it has ...

Interchange construction

The interchange was constructed beginning in the late 1990s as a major feature of the

Big Dig 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 Massachusetts Turnpike, Interstate 90 to Logan I ...

project. By using a variety of methods including soil freezing and tunnel jacking to maintain adjacent subway, freight and commuter rail operations, engineers were able to avoid major interruption of existing traffic flows. The name South Bay originates from the state of the area prior to nineteenth century

land reclamation Land reclamation, often known as reclamation, and also known as land fill (not to be confused with a waste landfill), is the process of creating new Terrestrial ecoregion, land from oceans, list of seas, seas, Stream bed, riverbeds or lake ...

efforts which filled an area of marshes and brackish water that was an estuary of

Boston Harbor Boston Harbor is a natural harbor and estuary of Massachusetts Bay, located adjacent to Boston, Massachusetts. It is home to the Port of Boston, a major shipping facility in the Northeastern United States. History 17th century Since its dis ...

with dirt from nearby high ground.

Gallery

References

External links

Design and Construction of Driven Pile Foundations: Lessons Learned on the Central Artery/Tunnel Project
Federal Highway Administration {{BostonMA Transportation in Boston Interstate 90 Interstate 93 U.S. Route 1 Road interchanges in Massachusetts Neighborhoods in Boston