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Updated:Apr 23, 2026
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Boston's Central Artery/Tunnel Project (Big Dig) timeline (1982–2007)

Boston's Central Artery/Tunnel Project (Big Dig) timeline (1982–2007)

  1. Environmental review begins for Central Artery plan

    Labels: Central Artery, FEIS R

  2. Final Environmental Impact Statement filed

    Labels: Final EIS, Federal Review

  3. Bechtel/Parsons Brinckerhoff hired as manager

    Labels: Bechtel, Parsons Brinckerhoff

  4. Congress approves federal funding and project scope

    Labels: United States, Federal Funding

  5. Final design advances and archaeology work begins

    Labels: Final Design, Archaeology

  6. FHWA issues Record of Decision for construction

    Labels: FHWA, Record of

  7. Construction begins on haul road and Ted Williams Tunnel

    Labels: Haul Road, Ted Williams

  8. Ted Williams Tunnel opens (commercial traffic)

    Labels: Ted Williams, Commercial Traffic

  9. I-90 extension opens to Logan Airport connection

    Labels: I-90 Extension, Logan Airport

  10. Northbound I-93 O’Neill Tunnel opens to traffic

    Labels: O'Neill Tunnel, I-93 Northbound

  11. Zakim Bridge opens (northbound lanes)

    Labels: Zakim Bridge, Leonard P

  12. Southbound I-93 O’Neill Tunnel opens to traffic

    Labels: O'Neill Tunnel, I-93 Southbound

  13. Old elevated Central Artery dismantling begins

    Labels: Elevated Central, Demolition

  14. Final downtown I-93 southbound ramp opens

    Labels: Downtown Ramp, I-93 Southbound

  15. I-90 connector tunnel ceiling collapse kills motorist

    Labels: I-90 Connector, Ceiling Collapse

  16. Project closeout concludes the Big Dig

    Labels: Project Closeout, Central Artery