Finishing the Big Dig / Photo gallery
Finishing the Big Dig As final designs for the Central Artery / Tunnel Project were coming together in the late 1980s, engineers were faced with a daunting problem: How to get the new highway across the Charles River without disturbing the existing double-deck I-93 bridge or the MBTA's underwater Orange Line subway tunnel. Charlestown residents had already rejected a complex, 18-lane ramp design known as "Scheme Z" because they believed it would blight their neighborhood.

Globe Staff Photo / David L. Ryan

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