I-76 Viaducts

Construction Update: Spring 2021

Construction on Center City Viaduct Substantially Completed

Construction to rehabilitate the Interstate 76 viaduct between University Avenue and 30th Street has been substantially completed with structural repairs finished, a new riding surface placed, and a new median barrier installed on the mile-long Center City structure.

Rebars in place prior to placing concrete for the new median barrier.

Off-peak and weekend lane restrictions and full closures in one direction will take place periodically through the spring as the contractor completes pavement grinding, installs rumble strips, plowable lane markers and new pavement markings, and finishes other post-construction “punch list” items to wrap up the two-plus years of construction on the $39.8 million project.

The new median barrier in place near the South Street exit.

Since starting repairs in spring 2019, PennDOT has rehabilitated the support columns beneath the viaduct, cleaned and refurbished the viaduct’s stormwater drainage system, repaired the concrete deck’s expansion dams and parapets, milled and repaved the viaduct’s riding surface, and installed a new concrete median barrier.

For the new riding surface, PennDOT used a fast-curing synthetic polyester polymer concrete (PPC) (see right) that allowed the viaduct’s surface to be rehabilitated while minimizing the need for long-term lane closures normally required for conventional concrete paving materials.

In addition, PennDOT’s contractor rehabilitated the bridge that carries the Schuylkill Expressway over Route 23 and Arrowmink Creek in West Conshohocken Borough, Montgomery County, and completed similar repairs to several other I-76 bridges in Montgomery County.