Keewaydin Lake is a concrete dam located in Oxford County, Maine, built in 1850. It carries a Low hazard potential classification and has a fair condition assessment.
Dam profile
NID height · 11 ft11 ft tall and 173 ft long. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic concrete gravity section and the water level is illustrative.
About Keewaydin Lake
The primary purpose of Keewaydin Lake is flood risk reduction. The dam is designed to control downstream flooding by temporarily storing excess water during storms and releasing it at a controlled rate. The dam is owned by Stoneham (local government). It impounds the Mill Brook near Stoneham.
The dam stands 11 feet tall and stretches 173 feet across, creates a reservoir covering 307 acres, has a maximum storage capacity of 1,445 acre-feet, and collects water from a drainage area of 10 square miles. Completed in 1850, 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. 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 10/12/2017.
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Location
| State | Maine |
| County | Oxford |
| Nearest City | Stoneham |
| River/Stream | Mill Brook |
| Coordinates | 44.25644, -70.82811 |
Physical Characteristics
| Dam Type | Concrete |
| NID Height | 11 ft |
| Dam Height | 11 ft |
| Dam Length | 173 ft |
| Year Completed | 1850 (176 years old) |
Storage & Hydraulics
| NID Storage | 1,445 acre-ft |
| Max Storage | 1,445 acre-ft |
| Normal Storage | 1,050 acre-ft |
| Surface Area | 307 acres |
| Drainage Area | 10 sq mi |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | Stoneham |
| Owner Type | Local Government |
| Hazard Classification | Low |
| Condition Assessment | Fair |
| Last Inspection | 10/12/2017 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | ME00076 |
| Federal ID | ME00076 |
| More Info | State Dam Safety Program |