How much concrete did the Big Dig use?

The project placed 3.8 million cubic yards of concrete. That's enough to build a sidewalk three feet wide and four inches thick from Boston to San Francisco and back three times. The project installed more than 26,000 linear feet of steel-reinforced concrete slurry walls.



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Aggregate provided 60% of the concrete used to build the Big Dig. Indicted were: former general manager Robert Prosperi; dispatch manager Marc Blais; dispatch manager John Farrar; quality control manager McNally; district operations manager Gregory Stevenson; and dispatch manager Keith Thomas.

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With interest, the project could ultimately cost around $24 billion, finally getting paid off in 2038. Besides creating a financial nightmare, the Big Dig was plagued by huge constructional flaws – which obviously added fuel to the fiscal firestorm.

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Perhaps ironically, the Blue Line takes several points of pride from its proximity to water, which gives it its name. Local historians claim the tunnel that runs under the harbor as the first underwater subway tunnel in the United States.

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The Sumner Tunnel was opened on June 30, 1934. It carried traffic in both directions until the opening of the parallel Callahan Tunnel in 1961. The Sumner Tunnel is named for William H. Sumner, the son of Governor Increase Sumner.

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The Boston's Big Dig project replaced the elevated deteriorating six-lane elevated Central Artery (I-93) with an underground expressway beneath the existing road, extended the I-90 tollway underground to the South Boston Seaport and Logan International Airport, built a new 10-lane bridge over the Charles River, and ...

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Opened to traffic June 30, 1934. It was originally a two-way road that carried traffic in both directions, until the opening of the parallel Callahan Tunnel in 1961. The tunnel is 8,448 feet long, of which approximately 3,960 feet are underwater.

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