Mattapoisett River Dam
Mattapoisett River Dam is an earth dam located in Plymouth County, Massachusetts, built in 1898. It carries a Significant hazard potential classification and has a satisfactory condition assessment.
About Mattapoisett River Dam
Mattapoisett River Dam is a dam in Plymouth, Massachusetts. The dam is owned by Town Of Mattapoisett (local government). It impounds the Mattapoisett River near Mattapoisett.
The dam stands 10 feet tall and stretches 250 feet across, creates a reservoir covering 2 acres, has a maximum storage capacity of 35 acre-feet, and collects water from a drainage area of 24 square miles. Completed in 1898, 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 04/22/2021.
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Location
| State | Massachusetts |
| County | Plymouth |
| Nearest City | Mattapoisett |
| River/Stream | Mattapoisett River |
| Coordinates | 41.65702, -70.83429 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 10 ft |
| Dam Length | 250 ft |
| Year Completed | 1898 (128 years old) |
Storage & Hydraulics
| NID Storage | 35 acre-ft |
| Max Storage | 35 acre-ft |
| Normal Storage | 20 acre-ft |
| Surface Area | 2 acres |
| Drainage Area | 24 sq mi |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Owner | Town of Mattapoisett |
| Owner Type | Local Government |
| Hazard Classification | Significant |
| Condition Assessment | Satisfactory |
| Last Inspection | 04/22/2021 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | MA02447 |
| Federal ID | MA02447 |
| More Info | State Dam Safety Program |