Malletts Mill is an earth dam located in Penobscot County, Maine, built in 1836. It carries a Significant hazard potential classification and has a poor condition assessment.
Dam profile
NID height · 16 ft16 ft tall and 300 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 Malletts Mill
The primary purpose of Malletts Mill is fire protection, stock, or small fish pond. The dam maintains a small impoundment used for fire suppression, livestock watering, or as a fish pond. The dam is owned by Malletts Mill Inc (private). It impounds the Mattakeunk.
The dam stands 16 feet tall and stretches 300 feet across, creates a reservoir covering 28 acres, has a maximum storage capacity of 108 acre-feet, and collects water from a drainage area of 11 square miles. Completed in 1836, 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 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 08/07/2025.
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Location
| State | Maine |
| County | Penobscot |
| River/Stream | Mattakeunk |
| Coordinates | 45.37069, -68.27098 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 16 ft |
| Dam Height | 16 ft |
| Dam Length | 300 ft |
| Year Completed | 1836 (190 years old) |
Storage & Hydraulics
| NID Storage | 108 acre-ft |
| Max Storage | 108 acre-ft |
| Normal Storage | 72 acre-ft |
| Surface Area | 28 acres |
| Drainage Area | 11 sq mi |
Ownership & Safety
| Purpose | Fire Protection, Stock, Or Small Fish Pond |
| Owner | Malletts Mill Inc |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Poor |
| Last Inspection | 08/07/2025 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | ME00381 |
| Federal ID | ME00381 |
| More Info | State Dam Safety Program |