Cocassett Lake Dam

About Cocassett Lake Dam

The primary purpose of Cocassett Lake Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Cocassett Lake Association, Inc. (private). It impounds the Cocassett River near Foxborough.

The dam stands 16 feet tall and stretches 350 feet across, creates a reservoir covering 32 acres, has a maximum storage capacity of 215 acre-feet, and collects water from a drainage area of 2 square miles. Completed in 1813, the structure is one of the older dams in the region, with over a century and a half of service.

This dam has a significant hazard potential classification, meaning that a failure could cause significant economic damage — flooding roads, bridges, or property downstream — but is not expected to result in loss of life. Its condition is rated fair — the dam has minor deficiencies that are being addressed or do not pose an immediate safety threat. An emergency action plan is in place for this dam. The most recent inspection on record was 10/18/2022.

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