White Pond Dam, a small pond popular with locals for fishing and kayaking, was required by the State Dam Bureau to improve their existing dam due to concerns with potential flooding on NH Rt. 107. The project consisted of two phases, the first raising the existing dam 3 feet, and second improving an auxiliary overflow. The dam extension was constructed using cast in place concrete utilizing imprinting form liners designed to leave an ashlar pattern look to the finished concrete. Improvements and upgrades were also made to the spillway and adjacent parking area. The overflow portion of the project (a separate location upstream) required excavation of the existing surface and installation of subsurface scour protections mats. The ABC’s (articulating concrete block) mats were set on a soil and stone layer designed to withstand large flood events. The installation of the mats required strategic preparation and coordination to ensure a safe and timely install. The new dam and spillway continue to provide access and recreation on the pond for both its residents and the public.
