The NH 3A and Dunklee Road intersection previously existed as an unsignalized ‘T’ intersection that required operators of tractor-trailers to drive in the oncoming lane when turning right onto NH 3A—an unsafe condition. Located in an industrial/commercial context, NH 3A is frequently used to bypass a tolled section of I-93 near the I-93/I-98/NH-3A junction. Working…
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…
Patriot Hydro sought the operational and maintenance benefits of converting water-level controls from timber flashboards to a remotely operated inflatable bladder system at a 12.4-MW hydroelectric project. An unusual amount of woody debris had accumulated in the facility’s intake channel. D&K evaluated the dam and hydrologic and hydraulic conditions to determine the feasibility of installing…
Spanning 12 ft across Bela Brook, a hydraulically inadequate metal arch culvert had begun to rust and had a history of scour damage. The Town of Bow chose to replace the structure, which had been replaced on the NHDOT Redlist. Our team designed a structure that increased the crossing’s hydraulic capacity by lengthening the span…