PennDOT has announced that construction is scheduled to begin on Monday, May 10th on a project to rehabilitate the 232-year-old bridge carrying Trinity Lane (Route 320) over Gulph Mills Creek in Upper Merion Township (just outside West Conshohocken). The work will close the portion of Trinity Lane between Holstein Road and Balligomingo Road through early August.

Known as the Trinity Lane Bridge, the bridge is the fifth oldest bridge in use in the United States and is listed on the National Register of Historic Places.The bridge was built in 1789 and reconstructed in 1980. The structure is 22-feet-long, 34-feet-wide and carries just over 7,000 vehicles per day.

During the three-month rehabilitation project, PennDOT’s contractor will utilize original salvaged stone to perform various masonry repairs, cleaning and repointing; install new guiderail and resurface the roadway and approaches. The original plaque on the structure will also be preserved.

During the closure, Trinity Lane (Route 320) motorists will be directed to use Holstein Road, Swedeland Road, and South Gulph Road. Local access will be maintained up to the construction zone.