Long Pond Dam
Long Pond Dam is an earth dam located in Middlesex County, Massachusetts, built in 1900. It carries a Low hazard potential classification and has a fair condition assessment.
About Long Pond Dam
The primary purpose of Long Pond 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 Ayer (local government). It impounds the Tributary Of Cold Spring Brook near Ayer.
The dam stands 8 feet tall and stretches 190 feet across, creates a reservoir covering 60 acres, has a maximum storage capacity of 330 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1900, the structure is over a century old.
This dam has a low hazard potential classification, meaning that failure would cause minimal damage, limited primarily to the dam owner's property, with no expected 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 10/14/2015. That was over 10 years ago.
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Location
| State | Massachusetts |
| County | Middlesex |
| Nearest City | Ayer |
| River/Stream | Tributary Of Cold Spring Brook |
| Coordinates | 42.56562, -71.54598 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 8 ft |
| Dam Length | 190 ft |
| Year Completed | 1900 (126 years old) |
Storage & Hydraulics
| NID Storage | 330 acre-ft |
| Max Storage | 330 acre-ft |
| Normal Storage | 150 acre-ft |
| Surface Area | 60 acres |
| Drainage Area | 0 sq mi |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | Town of Ayer |
| Owner Type | Local Government |
| Hazard Classification | Low |
| Condition Assessment | Fair |
| Last Inspection | 10/14/2015 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MA01220 |
| Federal ID | MA01220 |
| More Info | State Dam Safety Program |