PennDOT Completes Route 320 Improvement Project, Reopens Highway at Hanging Rock in Upper Merion Township


UPPER MERION TWP, PA — The Pennsylvania Department of Transportation (PennDOT) reopened Route 320 (South Gulph Road) today following the completion of a $9.2 million transportation improvement project to reconstruct, improve and realign the roadway away from the historic Hanging Rock in Upper Merion Township, Montgomery County.

“This project reinforces and improves our network and enhances safety on a heavily-traveled section of Route 320 (South Gulph Road), while also preserving the historical importance of Hanging Rock,” said Acting District 6 Executive Louis Belmonte.

Route 320 (South Gulph Road) had been closed to through traffic between Upper Gulph Road and Arden Road since construction began on this contract in January 2020. Under this improvement project, PennDOT’s contractor:

  • Realigned Route 320 (South Gulph Road) away from Hanging Rock, which had protruded into the roadway resulting in limited site distances;
  • Raised the profile of Route 320 (South Gulph Road) to meet the requirements for the 100-year flood elevation;
  • Reconstructed the cantilevered structure that carries Route 320 (South Gulph Road) over Gulph Creek;
  • Reconstructed the wall separating Route 320 (South Gulph Road) and Gulph Creek;
  • Added a southbound right-turn lane at the intersection with Upper Gulph Road;
  • Installed ADA curb ramps and traffic signal upgrades; and
  • Performed various drainage upgrades.
READ:  Suburban Philadelphia Seven Tower Bridge Property Awarded LEED Silver Certification

Allan Myers, LP of Worcester, Montgomery County was the general contractor on the project, which was financed with 100% state funds.

Motorists can check current road conditions by visiting the MyChesCo Traffic Center.

Follow MyChesCo on Twitter at and like us on Facebook at

Thanks for visiting! MyChesCo brings reliable information and resources to Chester County, Pennsylvania. Please consider supporting us in our efforts. Your generous donation will help us continue this work and keep it free of charge. Show your support today by clicking here and becoming a patron.