Groveton Municipal Lagoons Dam is an earth dam located in Coos County, New Hampshire, built in 2012. It carries a Significant hazard potential classification and has a satisfactory condition assessment.
Dam profile
NID height · 20 ft20 ft tall and 3,000 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 Groveton Municipal Lagoons Dam
Groveton Municipal Lagoons Dam is a dam in Coos, New Hampshire. The dam is owned by Northumberland Board of Selectmen (local government). It impounds the Na near Northumberland.
The dam stands 20 feet tall and stretches 3,000 feet across, creates a reservoir covering 16 acres, and has a maximum storage capacity of 55 acre-feet. Completed in 2012, the structure is relatively new.
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. The most recent inspection on record was 10/27/2021.
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Location
| State | New Hampshire |
| County | Coos |
| Nearest City | Northumberland |
| River/Stream | Na |
| Coordinates | 44.59723, -71.52133 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 20 ft |
| Dam Height | 20 ft |
| Dam Length | 3,000 ft |
| Year Completed | 2012 (14 years old) |
Storage & Hydraulics
| NID Storage | 55 acre-ft |
| Max Storage | 55 acre-ft |
| Normal Storage | 21 acre-ft |
| Surface Area | 16 acres |
Ownership & Safety
| Purpose | Other |
| Owner | Northumberland Board of Selectmen |
| Owner Type | Local Government |
| Hazard Classification | Significant |
| Condition Assessment | Satisfactory |
| Last Inspection | 10/27/2021 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | NH03797 |
| Federal ID | NH03797 |
| More Info | State Dam Safety Program |