Weymouth Great Pond Dam
Weymouth Great Pond Dam is an earth dam located in Norfolk County, Massachusetts, built in 1884. It carries a Significant hazard potential classification and has a satisfactory condition assessment.
About Weymouth Great Pond Dam
The primary purpose of Weymouth Great Pond Dam is water supply. The dam stores water for municipal, industrial, or agricultural use, helping ensure a reliable supply for the surrounding area. The dam is owned by Town Of Weymouth (local government). It impounds the Tributary To Mill River near Weymouth.
The dam stands 10 feet tall and stretches 200 feet across, creates a reservoir covering 358 acres, has a maximum storage capacity of 1,420 acre-feet, and collects water from a drainage area of 2 square miles. Completed in 1884, the structure is over a century old.
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 satisfactory, indicating no existing or potential dam safety deficiencies are recognized. An emergency action plan is in place for this dam. The most recent inspection on record was 05/13/2021.
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Location
| State | Massachusetts |
| County | Norfolk |
| Nearest City | Weymouth |
| River/Stream | Tributary To Mill River |
| Coordinates | 42.16964, -70.96677 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 10 ft |
| Dam Length | 200 ft |
| Year Completed | 1884 (142 years old) |
Storage & Hydraulics
| NID Storage | 1,420 acre-ft |
| Max Storage | 1,420 acre-ft |
| Normal Storage | 493 acre-ft |
| Surface Area | 358 acres |
| Drainage Area | 2 sq mi |
| Max Discharge | 132 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Water Supply |
| Owner | Town of Weymouth |
| Owner Type | Local Government |
| Hazard Classification | Significant |
| Condition Assessment | Satisfactory |
| Last Inspection | 05/13/2021 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | MA00777 |
| Federal ID | MA00777 |
| More Info | State Dam Safety Program |