Massapoag Pond Dam
Massapoag Pond Dam is an earth dam located in Middlesex County, Massachusetts. It carries a Significant hazard potential classification and has a fair condition assessment.
About Massapoag Pond Dam
The primary purpose of Massapoag Pond Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Lake Massapoag Rod And Gun Club, Inc. (private). It impounds the Salmon Brook near Dunstable.
The dam stands 14 feet tall and stretches 150 feet across, creates a reservoir covering 37 acres, has a maximum storage capacity of 730 acre-feet, and collects water from a drainage area of 13 square miles.
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 05/06/2020.
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Location
| State | Massachusetts |
| County | Middlesex |
| Nearest City | Dunstable |
| River/Stream | Salmon Brook |
| Coordinates | 42.65770, -71.49637 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 14 ft |
| Dam Length | 150 ft |
Storage & Hydraulics
| NID Storage | 730 acre-ft |
| Max Storage | 730 acre-ft |
| Normal Storage | 292 acre-ft |
| Surface Area | 37 acres |
| Drainage Area | 13 sq mi |
| Max Discharge | 527 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | Lake Massapoag Rod and Gun Club, Inc. |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Fair |
| Last Inspection | 05/06/2020 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | MA00136 |
| Federal ID | MA00136 |
| More Info | State Dam Safety Program |