Nemasket Park Dam
Nemasket Park Dam is an earth dam located in Plymouth County, Massachusetts, built in 1964. It carries a Significant hazard potential classification and has a fair condition assessment.
About Nemasket Park Dam
The primary purpose of Nemasket Park Dam is flood risk reduction. The dam is designed to control downstream flooding by temporarily storing excess water during storms and releasing it at a controlled rate. The dam is owned by Town Of Middleborough (local government). It impounds the Nemasket River near Middleborough.
The dam stands 23 feet tall and stretches 340 feet across, creates a reservoir covering 14 acres, has a maximum storage capacity of 326 acre-feet, and collects water from a drainage area of 62 square miles. Completed in 1964, the structure is well into its service life at over 50 years 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 fair — the dam has minor deficiencies that are being addressed or do not pose an immediate safety threat. The most recent inspection on record was 10/27/2020.
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Location
| State | Massachusetts |
| County | Plymouth |
| Nearest City | Middleborough |
| River/Stream | Nemasket River |
| Coordinates | 41.89028, -70.90444 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 23 ft |
| Dam Length | 340 ft |
| Year Completed | 1964 (62 years old) |
Storage & Hydraulics
| NID Storage | 326 acre-ft |
| Max Storage | 326 acre-ft |
| Normal Storage | 14 acre-ft |
| Surface Area | 14 acres |
| Drainage Area | 62 sq mi |
| Max Discharge | 1,530 cfs |
| Spillway Type | Controlled |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | Town of Middleborough |
| Owner Type | Local Government |
| Hazard Classification | Significant |
| Condition Assessment | Fair |
| Last Inspection | 10/27/2020 |
| Emergency Action Plan | No |
Identifiers
| NID ID | MA00015 |
| Federal ID | MA00015 |
| More Info | State Dam Safety Program |