AECOM Technical Services, Inc.

Peirce Island Bridge Inspection & Rating

Portsmouth, NH

Project Summary

The Peirce Island Road Bridge was constructed in 1958 and provides the only roadway connection to facilities on Peirce Island, including the State Fish Pier, Portsmouth Boat Ramp, Four Tree Island Recreation Area, Portsmouth City Pool, a public off-leash dog park, and the Peirce Island Wastewater Treatment Facility (WWTF). The structure is a 273’ long, four-span steel girder bridge with concrete deck. With construction of planned upgrades to the WWTF approaching, the City of Portsmouth initiated an inspection and evaluation of the bridge to assess its remaining service life, carrying capacity, and to plan for any needed repairs ahead of the WWTF upgrade project. Hoyle Tanner performed a hands-on inspection of the bridge, prepared load rating calculations, evaluated remaining service life of the structure, and compared the lifecycle costs of repairs to the bridge versus complete replacement.  A Summary Report was prepared documenting Hoyle Tanner’s findings. Hoyle Tanner provided services to the City of Portsmouth through a subcontract with AECOM as part of the engineering services contract for the WWTF upgrade project. 


  • Load Rating Analysis 
  • Conceptual Design 
  • Condition Assessment 
  • Report Preparation 
  • Subconsultant Coordination 
  • Alternatives Development & Analysis 

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