NB-751 Bridge Replacement at MP A-130.23

The NB-751 bridge lies at the very northern end of the Pennsylvania Turnpike’s Northeast Extension in Lackawanna County. Originally projected to be part of a ramp of a never-completed interchange with I-81, the bridge carries the Northern Extension over SR 4019 (Edella Road) on a skew of 30 degrees.  Gibson-Thomas was selected by the Pennsylvania Turnpike Commission to design the replacement structure at this location.

The most critical part of the project was the Traffic Control design.  Given its location along a major toll road, there could be no detour of Northeast Extension traffic. However, the proposed structure would be up to five feet higher in elevation than the existing, which would increase the difficulty of phased construction. The resulting design included a six-stage plan using single lane crossover traffic patterns, widening of curvature to accommodate WB-50 vehicles, and coordination with the adjacent toll collection facilities.  SR 4019 was also detoured during construction.

Additional work included resurfacing of the adjacent roadway, implementation of stormwater management features, and construction of a retaining wall.

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Gibson-Thomas is a multi-discipline consulting engineering firm established in 1916 in Latrobe, Pennsylvania. Our past experience, key staff and commitment to total client satisfaction are the major factors that our clients consider when contracting with Gibson-Thomas.

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