Pine Island Lake Dike is an earth dam located in Hampshire County, Massachusetts, built in 1920. It carries a Significant hazard potential classification and has a fair condition assessment.
Dam profile
NID height · 15 ft15 ft tall and 270 ft long. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic embankment section and the water level is illustrative.
About Pine Island Lake Dike
The primary purpose of Pine Island Lake Dike is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Pine Island Lake, Inc. (private). It impounds the Tributary to North Branch of Manhan River near Westhampton.
The dam stands 15 feet tall and stretches 270 feet across, creates a reservoir covering 71 acres, has a maximum storage capacity of 1,062 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1920, 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 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 10/29/2021.
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Location
| State | Massachusetts |
| County | Hampshire |
| Nearest City | Westhampton |
| River/Stream | Tributary to North Branch of Manhan River |
| Coordinates | 42.34158, -72.77042 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 15 ft |
| Dam Length | 270 ft |
| Year Completed | 1920 (106 years old) |
Storage & Hydraulics
| NID Storage | 1,062 acre-ft |
| Max Storage | 1,062 acre-ft |
| Normal Storage | 645 acre-ft |
| Surface Area | 71 acres |
| Drainage Area | 0 sq mi |
| Spillway Type | None |
Ownership & Safety
| Purpose | Recreation |
| Owner | Pine Island Lake, Inc. |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Fair |
| Last Inspection | 10/29/2021 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | MA00596 |
| Federal ID | MA00595S001 |
| More Info | State Dam Safety Program |