Boston Bridge

This bridge project near Pittsburgh involves the rehabilitation of an existing steel cantilever through-truss and twin girder approach spans, built in 1931. The girders have 5 approach spans, 60 feet to 107 feet long, and three long main spans, measuring 150 feet, 420 feet and 150 feet, totaling 1,182 feet.

The bridge carries S.R. 48 over the Youghiogheny River in Versailles Borough and Elizabeth Townships in Allegheny County, Pennsylvania. S.R. 48 is a two-lane roadway with a sidewalk on each side of the bridge.

ms consultants planned the replacement of the deck, including stringers and expansion dams, the drainage system and bearings. The existing decorative bridge railing was reused. Approximately 200 feet of roadway on each side of the bridge was also upgraded.

Because of the necessary long detour vehicles would have to endure during construction, ms developed an innovative concept to minimize impacts to the public and the adjacent town of Boston. The bridge was closed only on weekends to work on the deck, which was replaced using precast concrete-filled grid panels attached to new steel stringers. The prefabricated sections of the deck and stringers were used so sections of the existing deck could be removed and replaced during weekends. Pedestrian traffic has been maintained on the bridge through most of the construction schedule.

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