Clayton Street Transit Bridge Replacement | Boston, MA, US Founded in 1630, Dorchester is the largest and most diverse neighborhood in Boston, Massachusetts, and has 15 rapid transit and rail systems. One such system, the Ashmont Red Line, runs over Clayton Street Bridge. Challenge Originally constructed in 1911 and last repaired in 1926, the Clayton Street Bridge was a deteriorating three-span superstructure with dangerously low clearance and hazardous steel bents along the narrow sidewalks. The bridge spanned a busy street that trucks often used as a shortcut. Replacing the Clayton Street Bridge by conventional techniques could have taken months, a?ecting street and train tra?c and causing signi?cant commuters disruption and delays. Solution As the project design consultant, Louis Berger

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