Leonards Mill is a timber crib dam located in Penobscot County, Maine, built in 1796. It carries a Low hazard potential classification.
Dam profile
NID height · 7 ft7 ft tall and 135 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 Leonards Mill
The primary purpose of Leonards Mill 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 Maine Forest & Logging Museum Inc. (private). It impounds the Blackman Stream.
The dam stands 7 feet tall and stretches 135 feet across, creates a reservoir covering 1,200 acres, has a storage capacity of 4,200 acre-feet, and collects water from a drainage area of 36 square miles. Completed in 1796, the structure is one of the older dams in the region, with over a century and a half of service.
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. The most recent inspection on record was 08/18/1997. That was over 29 years ago.
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Location
| State | Maine |
| County | Penobscot |
| River/Stream | Blackman Stream |
| Coordinates | 44.87246, -68.63427 |
Physical Characteristics
| Dam Type | Timber Crib |
| NID Height | 7 ft |
| Dam Height | 7 ft |
| Dam Length | 135 ft |
| Year Completed | 1796 (230 years old) |
Storage & Hydraulics
| NID Storage | 4,200 acre-ft |
| Normal Storage | 4,200 acre-ft |
| Surface Area | 1,200 acres |
| Drainage Area | 36 sq mi |
Ownership & Safety
| Purpose | Hydroelectric |
| Owner | Maine Forest & Logging Museum Inc. |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 08/18/1997 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | ME96077 |
| Federal ID | ME96077 |
| More Info | State Dam Safety Program |