Water Works: Improvements to Massabesic Lake Dam

The City of Manchester is seeking a qualified contractor to design, fabricate, and install a hydraulic crest‑gate system and associated civil works to improve the Massabesic Lake Dam. The scope includes a 98‑ft hydraulic crest gate, precast control building, extensive earthwork, concrete repairs, electrical service, and required permitting. The contractor must also provide O&M manuals, training, and coordinate with multiple agencies for environmental compliance. • Design, supply, install, test, and commission a hydraulically actuated crest‑gate (≈ 98 ft wide). • Perform dam‑related civil works: dike raising, embankment stabilization, retaining‑wall reconstruction, and precast building installation. • Install 200 A underground electrical service, SCADA integration, and complete all permitting (NHDES wetland, USACE NWP, city building). • Deliver O&M manuals, warranties, and training; comply with strict environmental protection for wetlands and protected species. • Project timeline tight: Phase 1 substantial completion by Oct 1 2026; final completion by Nov 1 2027, with a final bid deadline of July 8 2026.