Ponkapoag Pond Dam
Ponkapoag Pond Dam is an earth dam located in Norfolk County, Massachusetts, built in 1930. It carries a Significant hazard potential classification and has a fair condition assessment.
About Ponkapoag Pond Dam
The primary purpose of Ponkapoag Pond Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Ma Department Of Conservation & Recreation (state). It impounds the Ponkapoag Brook near Canton.
The dam stands 7 feet tall and stretches 1,300 feet across, creates a reservoir covering 285 acres, has a maximum storage capacity of 1,653 acre-feet, and collects water from a drainage area of 1 square miles. Completed in 1930, the structure is well-established, with more than 75 years 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 05/02/2023.
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Location
| State | Massachusetts |
| County | Norfolk |
| Nearest City | Canton |
| River/Stream | Ponkapoag Brook |
| Coordinates | 42.19003, -71.10510 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 7 ft |
| Dam Length | 1,300 ft |
| Year Completed | 1930 (96 years old) |
Storage & Hydraulics
| NID Storage | 1,653 acre-ft |
| Max Storage | 1,653 acre-ft |
| Normal Storage | 1,126 acre-ft |
| Surface Area | 285 acres |
| Drainage Area | 1 sq mi |
| Max Discharge | 40 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | MA Department of Conservation & Recreation |
| Owner Type | State |
| Hazard Classification | Significant |
| Condition Assessment | Fair |
| Last Inspection | 05/02/2023 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | MA03107 |
| Federal ID | MA03107 |
| More Info | State Dam Safety Program |