State Street Bridge

City of Harrisburg | Dauphin County

The State Street Bridge is a concrete deck arch bridge that spans Pennsylvania Route 230 and Paxton Creek in the City of Harrisburg, Pennsylvania. The bridge was completed in 1930 and was renovated in 1955 and the road deck and sidewalks were replaced in 1957.

Through its years of service, the bridge lost its capacity to effectively transport storm water to the proper facilities. When this project was initiated, the bridge was allowing rain water to seep from the road surface down through the bridge onto the ground surface below. The purpose of this project was to restore the proper function of stormwater facilities to extend the lifespan of the structure, improve conditions beneath the bridge, and maintain the safety of the travelers on the bridge; which is heavily traveled by cars and pedestrians.

To meet the project goals, the design called for replacement of storm water pipes and inlets beneath the existing sidewalks and road surface, along with subsequent replacement of the sidewalks and asphalt that were disturbed to provide access for the utility installations. An adjacent gravel parking area was also renovated and regraded then topped with asphalt to add parking capacity to the area. This project was unique since the bridge is owned by the Department of General Services, who implemented the design and managed the construction of the project, in conjunction with the project professional. The project required third party Quality Assurance and Inspection Services to oversee the contractor’s Quality Control methods during the construction phase of the project, and AEG was an obvious choice for this work.

AEG provided on-site personnel for Quality Assurance and Inspections along with laboratory testing services at its in-house AASHTO Materials Reference Laboratory (ARML), located within a few miles of the project site.

The Quality Assurance and Inspection tasks included field inspection of construction procedures; collecting of bituminous samples and determining bulk specific gravity and thickness of the compacted asphalt; monitoring of earthwork lifts, materials, and QC test results; inspecting and approving bearing soil before structural fill or pouring concrete; and reviewing contractors’ design mixes, certificates of compliance, and material test reports.