Liberty Street Dam
Liberty Street Dam is an earth dam located in Plymouth County, Massachusetts, built in 1695. It carries a Significant hazard potential classification and has a fair condition assessment.
About Liberty Street Dam
The primary purpose of Liberty Street Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Town Of Hanson (local government). It impounds the Indian Head Brook near Hanson.
The dam stands 11 feet tall and stretches 330 feet across, creates a reservoir covering 68 acres, has a maximum storage capacity of 705 acre-feet, and collects water from a drainage area of 2 square miles. Completed in 1695, the structure is one of the older dams in the region, with over a century and a half 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. The most recent inspection on record was 10/20/2020.
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Location
| State | Massachusetts |
| County | Plymouth |
| Nearest City | Hanson |
| River/Stream | Indian Head Brook |
| Coordinates | 42.06501, -70.86502 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 11 ft |
| Dam Length | 330 ft |
| Year Completed | 1695 (331 years old) |
Storage & Hydraulics
| NID Storage | 705 acre-ft |
| Max Storage | 705 acre-ft |
| Normal Storage | 108 acre-ft |
| Surface Area | 68 acres |
| Drainage Area | 2 sq mi |
| Max Discharge | 82 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | Town of Hanson |
| Owner Type | Local Government |
| Hazard Classification | Significant |
| Condition Assessment | Fair |
| Last Inspection | 10/20/2020 |
| Emergency Action Plan | No |
Identifiers
| NID ID | MA00390 |
| Federal ID | MA00390 |
| More Info | State Dam Safety Program |