D&K’s bridge engineers conduct condition assessments and load ratings, make recommendations for rehabilitations and replacements, and perform bridge inspections in accordance with the guidelines outlined in the Federal Highway Administration’s National Bridge Inspection Program and Bridge Inspectors Training Manual. Our professionals are thoroughly familiar with the latest AASHTO, state design codes and specifications, and principles…
The Neshobe River crosses through the heart of downtown Brandon, and the historic stone masonry bridge carrying Central Street/US 7 and numerous utilities had a history of substantially inadequate hydraulic capacity. As a demonstration of this issue, the town opened the front and rear doors of the adjacent town offices during a large storm event…
As part of a JV team, D&K provided engineering services for the replacement of two farm bridges. The project involved Phase I, a preliminary design and cost estimate phase; Phase II, a final design and design documentation phase; and Phase III, construction phase services. The Boudreau bridge design is for a 35-ft by 15-ft-wide H-20…
A large storm event overwhelmed the Plunkton Road Bridge. The bridge was damaged but stable enough to keep open until a new structure could be designed and constructed. D&K assessed the damage, surveyed the site, and provided the town with an evaluation of several options to replace the bridge. The project team also assisted with…
MaineDOT sought to enlarge and improve a stream crossing in conjunction with a highway widening and resurfacing project. Under a MaineDOT General Consultant Agreement, D&K designed a new buried, precast concrete box structure with bed retention sills to aid aquatic organism passage and comply with Maine Department of Environmental Protection crossing rules. The interior dimensions…
The Town of Bow needed to replace a 20-ft, rigid-frame culvert with inadequate scour protection, foundations, and geometry. The roadway serves heavy truck traffic and intersects with NH 3A, a state highway frequently used to bypass a tolled section of I-93 near the Interstate I-89 intersection with I-93. D&K designed a replacement structure to address…
The Vermont Agency of Transportation had to replace a buried water conveyance structure that was (hydraulically) undersized and causing the rail and roadway embankments to act as a dam during moderate and large storm events. Located 70 feet below grade in some places, the existing system of metal pipes and concrete structures was in poor…
The City of Lebanon needed to replace a functionally obsolete crossing with inadequate geometry that was at the end of its service life. The three-span, 145-ft-span steel stringer bridge that crosses over the New Hampshire Railroad serves NH 12A at a skew with the railroad tracks immediately adjacent to the congested intersection with US 4….
The Town of Royalton secured FEMA funds to replace a culvert that had been undermined by a large storm event. DuBois & King designed a 12-ft-wide by 7-ft-tall metal arch plate culvert that was sized to accommodate large, native boulders to attenuate flows and provide eddies for fish to rest in while traveling up the…