Pittsburgh, PA – PennDOT District 11 is announcing the long-term closure of Commercial Street/Forward Avenue and Nine Mile Run Trail in the City of Pittsburgh, Allegheny County, will begin Monday, June 29 weather permitting.
Starting at approximately 7:00 AM on Monday, June 29, Commercial Street/Forward Avenue will close to traffic between Whipple Street and Summerset Drive continuously around-the-clock through early August. During this time, Nine Mile Run Trail will close continuously around-the-clock to all bicycle and pedestrian traffic between the Nine Mile Run parking lot in Swisshelm Park and the Frick Park Commercial Street Parking lot in Squirrel Hill. Motor vehicle traffic will be detoured:
Posted Detour
From Commercial Street on the Swisshelm Park side
· From Commercial Street, turn onto Whipple Street
· Turn left onto Monongahela Avenue
· Turn left onto S Braddock Avenue
· Turn left onto Forbes Avenue
· Turn left onto Beechwood Boulevard
· Continue to Forward Avenue
· End Detour
From Forward Avenue on the Squirrel Hill side
· Same detour in the opposite direction
Crews will perform preparatory work leading to the upcoming demolition of the existing I-376 Commercial Street Bridge followed by the newly built bridge being slid into place. For the safety of the public, the road and trail must be clear of vehicle, bicycle, and pedestrian traffic through the work zone as these operations occur. Following the reopening of I-376, once cleanup is complete and it has been determined Commercial Street and Nine Mile Run Trail is safe for use, both the road and trail will reopen to traffic.
The Commercial Street Bridge replacement project will utilize Accelerated Bridge Construction Techniques to laterally slide the new bridge onto the existing alignment of I-376 (Parkway East), which would be one of the largest lateral slide projects performed in Pennsylvania. The $95 million project located between the Edgewood/Swissvale (Exit 77) interchange and Squirrel Hill Tunnel in Edgewood and Swissvale boroughs, and the City of Pittsburgh began in June of 2024 with the reconstruction of the westbound I-376 off-ramp to Forest Hills/Wilkinsburg (Exit 78B). Tentatively, from July 10 through August 3, 2026, drivers can expect a 25-day full closure and detour of I-376. The overall project is anticipated to conclude in the summer of 2027.
To help keep travelers informed as work progresses, PennDOT has created an email distribution list for Parkway East traffic advisories and construction updates. Enroll by clicking on the Parkway East online sign-up form link and entering your email address.
Updates can also be found on the Commercial Street Bridge webpage, by following PennDOT’s regional X page @511PAPittsburgh or joining the Greater Pittsburgh Area PennDOT Facebook group.
Travelers can check conditions on major roads by visiting www.511PA.com. 511PA, which is free and available 24 hours a day, provides traffic delay warnings, weather forecasts, traffic speed information and access to more than 1,200 traffic cameras. 511PA is also available through a smartphone application for iPhone and Android devices, by calling 5-1-1, or by following regional X alerts.
Find PennDOT’s planned and active construction projects at www.pa.gov/DOTprojects. Subscribe to PennDOT news and find transportation results in Allegheny, Beaver, and Lawrence counties at www.pa.gov/DOTdistrict11.
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MEDIA CONTACT: Yasmeen Manyisha, 412-429-5044 or ymanyisha@pa.gov
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