Existing roadways, limitations established by nine sets of commuter rail tracks and an existing concrete plant required that the viaducts form a large loop in order to move traffic efficiently in and out of Boston. Horizontal curvature as tight as 212’ was required on the I-93 ramps and viaducts north of Boston, the tightest curves of any concrete segmental bridge in America. A savings of more than $27 million was achieved when this precast concrete segmental design was bid against a steel design with a total bid of $79 million.

The American Segmental Bridge Institute recognized this bridge with a 2003 Bridge Award of Excellence. It has received two additional awards.

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