Manhan River Dam is a concrete dam located in Hampshire County, Massachusetts, built in 1998. It carries a Significant hazard potential classification and has a fair condition assessment.
Dam profile
NID height · 16 ft16 ft tall and 115 ft long. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic concrete gravity section and the water level is illustrative.
About Manhan River Dam
The primary purpose of Manhan River Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by City of Easthampton (local government). It impounds the Manhan River near Easthampton.
The dam stands 16 feet tall and stretches 115 feet across, creates a reservoir covering 1 acres, has a maximum storage capacity of 150 acre-feet, and collects water from a drainage area of 69 square miles. Completed in 1998, the structure is 28 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. An emergency action plan is in place for this dam. The most recent inspection on record was 09/05/2019.
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Location
| State | Massachusetts |
| County | Hampshire |
| Nearest City | Easthampton |
| River/Stream | Manhan River |
| Coordinates | 42.27432, -72.67189 |
Physical Characteristics
| Dam Type | Concrete |
| NID Height | 16 ft |
| Dam Length | 115 ft |
| Year Completed | 1998 (28 years old) |
Storage & Hydraulics
| NID Storage | 150 acre-ft |
| Max Storage | 150 acre-ft |
| Normal Storage | 30 acre-ft |
| Surface Area | 1 acres |
| Drainage Area | 69 sq mi |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | City of Easthampton |
| Owner Type | Local Government |
| Hazard Classification | Significant |
| Condition Assessment | Fair |
| Last Inspection | 09/05/2019 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | MA00757 |
| Federal ID | MA00757 |
| More Info | State Dam Safety Program |