Long Pond
Long Pond is a stone dam located in Hancock County, Maine, built in 1930. It carries a Significant hazard potential classification and has a poor condition assessment.
About Long Pond
The primary purpose of Long Pond is hydroelectric. The dam generates hydroelectric power by channeling water through turbines, converting the energy of flowing water into electricity. The dam is owned by Mount Desert (local government). It impounds the Long Pond Brook.
The dam stands 8 feet tall and stretches 85 feet across, creates a reservoir covering 897 acres, and has a maximum storage capacity of 3,480 acre-feet. Completed in 1930, the structure is well-established, with more than 75 years 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 poor, meaning the dam has recognized safety deficiencies that require remediation to address risks. An emergency action plan is in place for this dam. The most recent inspection on record was 08/15/2024.
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Location
| State | Maine |
| County | Hancock |
| River/Stream | Long Pond Brook |
| Coordinates | 44.34950, -68.35757 |
Physical Characteristics
| Dam Type | Stone |
| NID Height | 8 ft |
| Dam Height | 8 ft |
| Dam Length | 85 ft |
| Year Completed | 1930 (96 years old) |
Storage & Hydraulics
| NID Storage | 3,480 acre-ft |
| Max Storage | 3,480 acre-ft |
| Normal Storage | 2,900 acre-ft |
| Surface Area | 897 acres |
Ownership & Safety
| Purpose | Hydroelectric |
| Owner | Mount Desert |
| Owner Type | Local Government |
| Hazard Classification | Significant |
| Condition Assessment | Poor |
| Last Inspection | 08/15/2024 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | ME00398 |
| Federal ID | ME00398 |
| More Info | State Dam Safety Program |