Hoppin Hill Reservoir Dam

Weston & Sampson provided engineering analysis, design, permitting, bidding, and construction management services associated with the rehabilitation of Hoppin Hill Reservoir Dam located in Attleboro, Massachusetts.

The 1,000-foot-long, 27-foot-tall HIGH hazard potential embankment dam was in poor overall condition with significant structural, operational, and maintenance deficiencies. Rehabilitation construction included installation of a two-stage inclined chimney filter and drain in combination with downstream slope flattening to control seepage and increase overall embankment stability. Improvements were also made to the dam’s appurtenances, including replacement of the concrete spillway structure and meandering chute channel, demolition and removal of the low-level outlet aeration basin and outfall channel, extension of the low-level outlet conduit in coordination with embankment filling, and replacement of the low-level outlet control gate. We helped the city win $1,000,000 in a combined grant and low interest loan from MA EEA for the repairs.