Curtis Pond, the dam, and its site serve as a beloved cultural hub and source of identity to Calais and the Maple Corner community. The dam underwent excessive seepage, movement of the stone wall, and piping of the earth/sand backfill through voids in the wall. The project had long-term enthusiastic partners, including the Curtis Pond…
The Allen Site Dam is a 1,520-ft-long by 21-ft-high earthen NRCS flood-control dam in a suburban context. The Town of Walpole wanted the dam maintained to provide flood mitigation for an increased level of downstream property development. D&K provided survey, inspection, breach analysis, and a range of other services to evaluate the current state of…
The Norwich Reservoir Dam was a run-of-the-river, cyclopean concrete gravity dam located on the Charles Brown Brook. The dam impounded a reservoir which became silted in, and the dam served no useful function. The dam caused significant negative impacts to the brook and to downstream reaches. The dam blocked fish passage and caused downstream sediment…
The Harrison Lake National Fish Hatchery required rehabilitation of several aging kettles that controlled water level in ponds, movement of water between ponds, and pond draining. D&K completed a topographic survey of the site to identify the location and as-built elevations of each kettle and valve replacement. Our structural engineers reviewed the original kettle design…
Sweet Pond Dam is a 20-ft-high by 77-ft-long circa-1928 dam that impounds an 18-acre pond with a contributing drainage area of approximately 1 square mile. The dam sustained uncontrolled and excessive seepage through highly fractured and weathered bedrock and posed a barrier to AOP. D&K provided planning, evaluation, alternatives analysis, preliminary and final design, permitting…
A 200-ft-long by 20-ft-high town roadway embankment was destabilized by scour from the White River from spring snow melt and a storm event. The Town of Bethel applied for and received FEMA funding and engaged D&K to evaluate, survey, design, and provide permitting assistance and construction phase services for repairs to the slope and the…
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…
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…