USDA Forest Service White Mountain National Forest South Gale Road and Bridges Reconstruction

Bethlehem, New Hampshire

A storm event damaged four bridges and sections of the roadway, removing surfacing, and cutting into the subgrade. DuBois & King provided engineering and construction services for a design-build project to reconstruct 0.6 miles of South Gale Road and to address damages to four bridges.

DuBois & King led the design-build team and provided all engineering design services. The project included restoring the roadway sections, providing stability, improving drainage, and replacing aggregate surfacing and some asphalt surfacing. The road work included embankment construction, drainage excavation, and installation of a culvert and paved aprons to four bridges.

Three single-span treated timber road bridges were replaced and one repaired. The pre-existing bridges had solid-sawn timber stringers, nail-laminated decks, and timber wall abutments. Three bridges were replaced with new concrete panel abutments and wingwalls faced with real stone. The superstructures are prefabricated, glue-laminated timber stringers and decks, with matching timber railings. The fourth bridge required repair to the abutments, installation of a wearing surface, paving of the approaches, and the replacement of riprap stream armor.

D&K services included field survey and base mapping; utility coordination; geotechnical borings; wetlands identification; permit applications; preliminary and final design plans; and construction phase services.