About this Project

This project involves the replacement of two adjacent highway structures that span Bushkill Creek in Northampton County, PA. The project is in a karst environment susceptible to sinkholes and surface depression formation. The existing bridges have experienced structural stresses and exhibit the potential for failure due to the dynamic subsurface karst activity. The karst features and complex hydrogeologic settings have led to recurring instability. AEG was a part of the design team tasked to tackle these challenging conditions for a permanent and effective replacement solution. The selected replacement structure design consists of an arch culvert supported on a large, open-grid mat foundation.  AEG was responsible for the geotechnical aspects of the foundation replacement analysis, including completion of the Subsurface Exploration Planning Submission (SEPS), administering the subsurface drilling investigation, and overseeing and directing the drilling inspectors and drilling operations.  Upon completing the drilling program, AEG prepared the project’s roadway geotechnical engineering and structure foundation reports.  AEG will provide construction consultation services once construction begins.