PROJECT TYPE: Federal/State Agency PROJECT REGION: Pennsylvania

PennDOT District 5 Willowbrook Road Culvert

Allen Township, Lehigh County, PA

Colliers Engineering & Design provided structural and geotechnical engineering services for the design of a skewed precast 84-foot long, 24-foot x 8.5-foot single cell culvert with a concrete overlay carrying four lanes of traffic over Catasauqua Creek. The culvert is underlain by Karst geology and is part of the larger Willowbrook Road improvements project associated with a proposed Fed Ex Ground hub in Allentown.

The design process was accelerated and took only six weeks. Design also included four 20-foot long cast-in-place wingwalls and associated cast-in-place concrete aprons at the inlets. The design utilized PennDOT LRFD design software, and our professionals prepared all construction plans, design calculations, quantities, and submittal forms for PennDOT approval.


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  • Geotechnical
  • Structural Engineering