On Monday, PennDOT reopened Interstate 376, known in Pittsburgh as the Parkway East, a week ahead of schedule following the successful replacement of the Commercial Street Bridge. The accelerated bridge construction (ABC) was one of Western Pennsylvania's most closely watched transportation projects. 

The highway reopened to traffic on the evening of July 27 after crews completed the intensive 25-day closure that allowed the existing Commercial Street Bridge to be demolished and a newly constructed bridge to be moved into place using ABC methods. The reopening came well ahead of the original Aug. 3 deadline, and it restored a critical commuter route that carries roughly 100,000 vehicles each day. 

The early completion represents a significant achievement for PennDOT and its contracting partners.  

Pennsylvania Gov. Josh Shapiro joined PennDOT Secretary Mike Carroll and local officials to celebrate the reopening, highlighting the project's early delivery as an example of using accelerated construction methods to reduce impacts on motorists while modernizing aging infrastructure, according to reports from KDKA.  

The Commercial Street Bridge replacement is part of a broader $95 million project located between the Edgewood/Swissvale interchange and the Squirrel Hill Tunnel, according to PennDOT.  

The original bridge, which was approximately 75 years old, was replaced with a prefabricated structure built adjacent to the existing bridge before being slid into its final position during the full highway closure. This ABC approach condensed what would traditionally require months—or even years—of traffic restrictions into a single 25-day closure.  

The project required a carefully sequenced operation. Following the July 10 Parkway East closure, crews demolished the original bridge, cleared the site, and moved the approximately 22-million-pound replacement bridge into place. Then they completed paving, utility work, barrier installation and final roadway tie-ins.  

The reopening also introduces new traffic patterns designed to improve safety and traffic flow through the corridor, according to a WTAE report. PennDOT has urged motorists to remain alert as they become accustomed to the updated roadway configuration.  

Although traffic is flowing on I-376, construction is not complete. PennDOT will continue work on the overall Commercial Street Bridge Replacement Project through 2027, with additional activities occurring outside of the full Parkway closure.  

For transportation agencies across the country, the project serves as another high-profile example of ABC’s ability to reduce user impacts. PennDOT restored one of Pittsburgh's busiest transportation corridors well ahead of schedule while advancing a long-term infrastructure investment designed to improve safety and mobility for decades to come.  

Sources: PennDOT, KDKA, WTAE