PA 403 13.5 Mile Corridor Rehabilitation

In northern Somerset County, SR 0403 connects the communities in the Stonycreek River valley with the city of Johnstown. This highway was largely constructed in the late 1920s and early 1930s and has received periodic updates over the previous decades. PennDOT District 9-0 determined that a 13.5 mile corridor from Wilbur Road, south of Hooversville, to the Cambria County line was in need of a restoration, resurfacing, and rehabilitation (3R) project to improve safety and mobility performance.  The Gibson-Thomas team was selected to design this project.

The combined corridor project will include:

  • Resurfacing of 13.5 miles of roadway, with associated improvements to guide rail, highway drainage, signing, and pavement markings
  • Cracking, seating, and asphalt overlay of the exposed concrete pavement at the US 219 interchange south of Davidsville
  • Replacement of two structures and removal of a bridge carrying the highway over an abandoned coal mine tramway
  • Minor rehabilitation and preservation work on five structures throughout the corridor
  • Mitigation of two slope failures
  • Safety improvements at several horizontal curves
  • Upgrading two sets of traffic signals

Ultimately, a series of funding, permitting, and right-of-way constraints led to the division of the project into two separate construction projects.  The first portion, consisting primarily of 3R activities on the southern 8.3 miles of the corridor, was let in February 2020 and will be constructed through the Fall of 2020.  The second project includes all of the structure, signal, and geotechnical work and will be let in the fall of 2022.


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Gibson-Thomas is a multi-discipline consulting engineering firm established in 1916 in Latrobe, Pennsylvania. Our past experience, key staff and commitment to total client satisfaction are the major factors that our clients consider when contracting with Gibson-Thomas.

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