PA ROUTE 51 TO I-376 of the Mon Fayette Expressway



The PA Route 51 to I-376 Project is the final and the largest of the four Mon/Fayette Expressway (Turnpike 43) projects. The first three Mon/Fayette projects which have been built connect I-68 in West Virginia to PA Route 51 in Jefferson Hills, Allegheny County.

The funding availability for the PA Route 51 to I-376 Project required it to be divided into two sections; north of the Monongahela River and south of the Monongahela River. The first to be constructed will be south of the Monongahela River, which is an eight-mile stretch between PA Route 51 and PA Route 837, and includes the areas of Jefferson Hills, West Mifflin, Dravosburg, the City of Duquesne and the City of Clairton.

Currently, on the Southern Section only, the PA Turnpike Commission (PTC) is acquiring the property necessary for construction to begin. The properties being acquired now are “total takes,” which means the entire property is needed for the construction of the roadway. Once the “total takes” are acquired, the PTC will move on to the “partial takes,” which means only a portion of the landowners’ properties are needed for construction.

This is a lengthy process that will take multiple years. This Right-of-Way acquisition process must be complete before construction can begin. Due to the size and scope of the Project, construction of the Southern Section has been broken into multiple sections. It is anticipated that construction of the first section could begin in 2021. Construction costs for the entire Southern Section Project are estimated to be approximately $900 million.

The Mon/Fayette PA Route 51 to I-376 Project began in 1993 when the environmental decision, the Record of Decision (ROD) was issued by the Federal Highway Administration (FHWA) in December 2004. Design then started in 2004 but was halted in 2009 due to lack of funding. In 2013, Act 89 provided funding which allowed the project to restart. In 2015, the PTC performed studies to identify how the originally designed project could be modified and completed with the funding available through Act 89.

The studies showed a substantial reduction in the project cost would be to eliminate the west leg of the original project that led into Pittsburgh. This also reduced residential and business displacements. The Re-evaluation of the Final Environmental Impact Statement (FEIS) was approved in 2019 with the changes that were recommended to reduce the scope of the original PA Route 51 to I-376 project. Final design of the roadway is now moving ahead.

When construction of the entire 14-mile PA Route 51 to I-376 Project is complete, the Mon/Fayette Expressway will stretch 68 miles from I-68 near Morgantown, West Virginia to I-376 in Monroeville, Allegheny County.