Tremont Mill Pond

About Tremont Mill Pond

The primary purpose of Tremont Mill Pond is hydroelectric. The dam generates hydroelectric power by channeling water through turbines, converting the energy of flowing water into electricity. The dam is owned by Town Of Wareham, Ma (local government). It impounds the Weweantic River near Wareham.

The dam stands 15 feet tall and stretches 1,200 feet across, creates a reservoir covering 57 acres, has a maximum storage capacity of 340 acre-feet, and collects water from a drainage area of 53 square miles. Completed in 1845, the structure is one of the older dams in the region, with over a century and a half of service.

This dam carries a high hazard potential classification, which means that a failure or uncontrolled release of water would likely cause loss of human life. This classification reflects the consequences of failure, not the likelihood — it indicates that people live or work in the area downstream. Its condition is rated unsatisfactory, indicating serious safety deficiencies exist that require immediate attention or remedial action. An emergency action plan is in place for this dam. The most recent inspection on record was 06/10/2025.

Living Downstream

If you live or work downstream of this dam, consider taking these steps: learn your local evacuation routes, check whether your county emergency management office has a dam failure inundation map, and sign up for local emergency alerts. The Massachusetts dam safety program can provide more specific information about emergency planning for this structure.

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