Case Study: Sawyer Mills Dam Removal

Sawyer Mill Upper & Lower Dam Removals Design, Permitting, & Construction Services

Paul D’Orazio (owner) in association with NH Department of Environmental Services (Dover, NH)

 

Gomez and Sullivan is providing design, permitting, and bidding services for the removal of the Sawyer Mill Upper and Lower Dams on the Bellamy River in Dover, NH; both privately owned. The Upper Dam is 67 feet long and 12 feet high and is constructed from mortared cut stone block. The Lower Dam is 64 feet long and 11 feet high and is of similar construction. The NHDES Dam Bureau had issued a Letter of Deficiency for these two High Hazard Potential dams- the main deficiency being inadequate spillway capacity. The goals for removing the Upper and Lower Sawyer Mill Dams is to restore ecological processes including migratory fish passage, natural sediment transport, and to remove the dams from State regulatory inspection. Work includes review of previously prepared hydrologic, hydraulic and sediment analyses; topographic survey, bathymetric survey, sediment depth mapping and contaminant sampling, sediment management plan, structural impact assessment of the adjoining buildings and upstream Route 108 Bridge; engineering design plans, cost estimates, preparation and filing of permit applications, bid documents and bidding assistance.