South Avenue over Shields Brook Bridge Replacement

Derry, New Hampshire

Client: Town of Derry, New Hampshire


  • Bid Administration
  • Construction Administration
  • Construction Observation
  • Design
  • Engineering Study
  • Permitting

Project Summary

The previous South Avenue bridge consisted of a Jack Arch superstructure on concrete encased stone abutments which was constructed in 1935.  Due to the relatively rare nature of the bridge superstructure, a thorough study of all remaining Jack Arch bridges in New Hampshire was required as part of the Section 106 process.  The previous bridge was inspected and it was determined that the superstructure was beyond repair, however with slight modifications the substructure could be retained.  This significantly reduced the overall project cost as the abutments were built integrally with one an abutting business foundation which would have required significant shoring if the abutment was replaced.

The bridge superstructure was replaced with a precast, prestressed concrete deck beam superstructure on new cast in place beam seats.  The use of the precast superstructure allowed for a shortened construction duration and minimized disruption to the public.  The project also included 260 feet of roadway improvements including intersection reconstruction and ADA related improvements to the approach sidewalks.  This project is partially funded through the NHDOT Municipal Bridge Aid Program.

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