Manchester Road Bridge

Amherst, New Hampshire

Client: Town of Amherst, NH


  • Engineering Study
  • Design
  • Permitting
  • Right-of-Way
  • Bidding Administration
  • Construction Administration
  • Construction Observation

Project Summary

The former Manchester Road Bridge over Beaver Brook Bridge was constructed in 1980 and is situated directly adjacent to the intersection of Manchester and Mack Hill Roads. The bridge consisted of 3 corrugated metal pipes (CMPs), each with a clear span opening of approximately 10′ which were hydraulically inadequate for large rain event flows. Due to significant section loss in the bottoms and sides of the CMPs, the bridge was closed to all traffic.

Hoyle, Tanner designed a new 40′ single-span, prestressed concrete deck beam bridge on cast-in-place concrete abutments and 600′ of roadway and intersection improvements. Due to the location of the bridge in a National Register Historic District, extensive coordination with the Historic District Commission was completed. As a result of these meetings, aesthetic additions were made to the bridge including powder coated railing, and concrete form liners to emulate the previous bridge wingwalls and concrete coloring. The project also included extensive utility coordination and relocation as well as preparation of a Conditional Letter of Map Revisions to address changes to the FEMA flood elevations in the vicinity of the bridge.

The project was partially funded through the NHDOT Municipally-Managed State Bridge Aid Program.

Click on thumbnail to view