South Bay Interchange

South Bay Interchange
Location
South Bay, Boston, Massachusetts
Roads at junction:	I-90 I-93 US 1 Route 3
Construction
Opened:	1997–2003
Maintained by:	Massachusetts Department of Transportation
Map

The South Bay Interchange is a massive interchange in the South Bay region of Boston, Massachusetts, USA. The interchange consists of Interstate 90, the Mass Pike Extension, and the Interstate 93 concurrency with US 1 and MA 3 south of the Thomas P. O'Neill Jr. Tunnel.^[1]

The interchange was constructed beginning in the late 1990s as a major feature of the Big Dig 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 avoid major interruption of existing traffic flows. The name South Bay originates from the state of the area prior to nineteenth century land reclamation efforts which filled an area of marshes and brackish water that was an estuary of Boston Harbor with dirt from nearby high ground.^[2]

References

^ "Land transfer agreement with the United States Postal Service". Federal Highway Administration. 1997. p. 2. http://www.fhwa.dot.gov/realestate/fltmanual/fltappend14.pdf. Retrieved 10 December 2009.
^ Parker, Dave (January 8, 1998). "Boston tangler". London: New Civil Engineer. http://www.nce.co.uk/boston-tangler-a-mass-of-tunnels-and-viaducts-is-being-constructed-to-make-a-crucial-interchange-in-the-middle-of-boston-without-interfering-with-the-smooth-flow-of-traffic/839849.article. Retrieved 10 December 2009.

External links

Design and Construction of Driven Pile Foundations: Lessons Learned on the Central Artery/Tunnel Project Federal Highway Administration

Road transportation infrastructure of Boston

Interstate Highways	Massachusetts Turnpike (I-90) I-93 I-95

U.S. Routes	US 1 US 3 US 20

State Routes	Route 1A Route 2 Route 2A Route 3 Route 9 Route 28 Route 30 Route 99 Route 128 Route 145 Route 203

Parkways	Arborway Blue Hills Parkway Day Boulevard Fenway Jamaicaway Memorial Drive Morrissey Boulevard Morton Street Park Drive Riverway Stony Brook Reservation Parkways Soldiers Field Road Storrow Drive Truman Parkway VFW Parkway West Roxbury Parkway

Major streets	Beacon Street Bennington Street Boylston Street Commonwealth Avenue Dorchester Avenue Huntington Avenue Massachusetts Avenue Newbury Street State Street Tremont Street Washington Street

Bridges	Anderson Memorial Bridge Boston University Bridge Bowker Overpass Charlestown Bridge Eliot Bridge Harvard Bridge Leverett Circle Connector Bridge Longfellow Bridge North Beacon Street Bridge Tobin Bridge Leonard P. Zakim Bunker Hill Memorial Bridge

Tunnels	Callahan Tunnel Dewey Square Tunnel Sumner Tunnel Thomas P. O'Neill Jr. Tunnel Ted Williams Tunnel

Expressways	East Boston Expressway John F. Fitzgerald Expressway (Central Artery) Northeast Expressway Northern Expressway Northwest Expressway Southeast Expressway Southwest Expressway (Southwest Corridor) Western Expressway

See also	Big Dig Boston Post Road Braintree Split Emerald Necklace Inner belt List of crossings of the Charles River List of numbered routes in Massachusetts South Bay Interchange Streets in Boston, Massachusetts