Highland Lake Dam
Highland Lake Dam is an earth dam located in Merrimack County, New Hampshire, built in 1935. It carries a Significant hazard potential classification and has a fair condition assessment.
About Highland Lake Dam
The primary purpose of Highland Lake Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Town Of Andover (local government). It impounds the Tr Sucker Brook near Andover.
The dam stands 10 feet tall and stretches 180 feet across, creates a reservoir covering 210 acres, has a maximum storage capacity of 1,050 acre-feet, and collects water from a drainage area of 5 square miles. Completed in 1935, 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 fair — the dam has minor deficiencies that are being addressed or do not pose an immediate safety threat. An emergency action plan is in place for this dam. The most recent inspection on record was 09/20/2022.
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Location
| State | New Hampshire |
| County | Merrimack |
| Nearest City | Andover |
| River/Stream | Tr Sucker Brook |
| Coordinates | 43.45968, -71.74898 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 10 ft |
| Dam Height | 10 ft |
| Dam Length | 180 ft |
| Year Completed | 1935 (91 years old) |
Storage & Hydraulics
| NID Storage | 1,050 acre-ft |
| Max Storage | 1,050 acre-ft |
| Normal Storage | 440 acre-ft |
| Surface Area | 210 acres |
| Drainage Area | 5 sq mi |
| Max Discharge | 670 cfs |
Ownership & Safety
| Purpose | Recreation |
| Owner | TOWN OF ANDOVER |
| Owner Type | Local Government |
| Hazard Classification | Significant |
| Condition Assessment | Fair |
| Last Inspection | 09/20/2022 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | NH00035 |
| Federal ID | NH00035 |
| More Info | State Dam Safety Program |