Haverhill Bath Bridge, Haverhill, NH 2008
This $1,250,000 project was undertaken using a very unique tension type shoring system. This 256 foot bridge is a town lattice truss with arches and spans 256 feet over the Ammonoosuc River. The restoration included extensive replacements of rotten and broken truss members, 50% replacement of needle beams, complete reconstruction and replacement of 5 out of the 8 arch ends at their bearings, and choice replacements of floor beams, tie beams, bearing beams, rafters, and bracing components.
The bridge also received all new floor decking and siding, along with a new standing seam metal roof and a No-Char fire retardant coating. The north and south abutments, along with the center pier received new concrete caps. The bridge suffered from both a sweep and lean of the trusses and arches towards the sidewalk. The sweep was removed and the trusses and arches where plumbed and reshaped to their original geometry.
This $867,000 project was substantially completed in six months. This bridge spans 121-feet across the Black River and is built in the Town Lattice Truss style. The work on the bridge structure involved substantial structural repairs to the each lattice truss, including complete replacement of the bottom chords, 30% replacement of lattice members, all new floor beams and lower lateral bracing, new laminated deck, partial rafter and knee brace replacement, and all new roof sheathing and siding. New standing seam metal roofing was also installed.
Other work included new steel guardrail, new concrete abutment caps, re-graded approaches, and placement of 145 CY of stone 4 to 5 feet in diameter in the river to buttress the dried laid stone abutment. The concrete abutment was refaced and insecticide/fungicide and fire retardant coatings were applied.
