Millen Lake Dam
Millen Lake Dam is an earth dam located in Sullivan County, New Hampshire, built in 1970. It carries a Significant hazard potential classification and has a satisfactory condition assessment.
About Millen Lake Dam
The primary purpose of Millen Lake Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Millen Lake Association (private). It impounds the Tr Ashuelot River near Washington.
The dam stands 23 feet tall and stretches 115 feet across, creates a reservoir covering 156 acres, has a maximum storage capacity of 1,348 acre-feet, and collects water from a drainage area of 1 square miles. Completed in 1970, the structure is well into its service life at over 50 years old.
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 satisfactory, indicating no existing or potential dam safety deficiencies are recognized. An emergency action plan is in place for this dam. The most recent inspection on record was 07/17/2019.
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Location
| State | New Hampshire |
| County | Sullivan |
| Nearest City | Washington |
| River/Stream | Tr Ashuelot River |
| Coordinates | 43.15827, -72.12774 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 23 ft |
| Dam Height | 23 ft |
| Dam Length | 115 ft |
| Year Completed | 1970 (56 years old) |
Storage & Hydraulics
| NID Storage | 1,348 acre-ft |
| Max Storage | 1,348 acre-ft |
| Normal Storage | 463 acre-ft |
| Surface Area | 156 acres |
| Drainage Area | 1 sq mi |
| Max Discharge | 242 cfs |
Ownership & Safety
| Purpose | Recreation |
| Owner | MILLEN LAKE ASSOCIATION |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Satisfactory |
| Last Inspection | 07/17/2019 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | NH00236 |
| Federal ID | NH00236 |
| More Info | State Dam Safety Program |