Towle Road Bridge Replacement

Chester, New Hampshire

Alternatives analysis, design, and construction phase services for the replacement of a failing bridge that consisted of two 5-ft diameter steel culverts. D&K performed ground surveys, base map preparation, subsurface investigations, and a preliminary hydraulic analysis to size the new structure to pass the 50-year storm event. Alternatives considered included several suitable bridge types including a new precast concrete arch structure, a precast voided slab deck, and a cast-in-place concrete deck slab. The evaluations considered geometric, hydraulic, and structural requirements; detailed construction cost comparisons; roadway improvements; and environmental impacts and permitting requirements.

DuBois & King engineers proceeded to provide engineering services for a 20-ft span, precast concrete arch and prepared Preliminary Plans indicating engineering details of the new bridge and roadway with an updated construction cost estimate. Preliminary design work included preparation and submission of permits to the New Hampshire Department of Environmental Services. Bid and construction phase administration and engineering services were provided for the project. The project was developed in accordance with the NHDOT Municipally Managed Program bridge design procedures.