Long Pond Dam Repairs

Long Pond Dam required design of repairs and associated permit application preparation, construction drawings and technical specifications. The pond contains Common Loon habitat and Fuss & O’Neill coordinated with the New Hampshire Fish & Game Department during development of drawdown procedures before incorporating them into design and permitting documents.

Repairs to Long Pond Dam included removal of wooden flashboards and raising the concrete ogee spillway to match the flashboard elevations. In this manner, the normal pond level would not change and impacts to the Common Loon habitat would be minimized. In addition to modifying the spillway crest, improvements to the dam included re-lining the low level outlet and replacing the gate structure; removal of badly deteriorated structural concrete from upstream and downstream training walls and retaining walls; and re-facing the walls with new reinforced concrete and leveling the dam crest.