Engineering Project Case Studies | Erdman Anthony

New Expressway and Interchange

Take a quick flyover of PennDOT District 2-0’s new interchange for US Route 322 at PA 144 in Centre County.

The Potters Mills Gap project in central Pennsylvania involved replacing an existing two-lane section of US Route 322 with 3.75 miles off our-lane expressway on new alignment. The highway is an important link between southeastern Pennsylvania and State College, home of Penn State University, that has been widened into a four-lane expressway from the southeast over the years. This project provided an extension of the expressway that improves safety and mobility along the corridor. The overall design effort included two new interchanges, five bridges, and 5,000 to 6,000 feet of retaining walls.

As a major subconsultant on the project team, Erdman Anthony provided design services for the westernmost interchange, which connects to Route 144 and the local roadway network. This $35 million section of construction included a diamond interchange with a 135-foot-long single-span bridge carrying the US 322 expressway, a 1,700-foot-long median retaining wall, 1.5 miles of new or reconstructed local roadways, and a new roundabout at the westbound ramp intersection.

Erdman Anthony also provided field survey and right-of-way plan development for the entire corridor.

Robert Leonard, PE
Robert Leonard, PE
 717-766-1741 x 5006