Exeter Sewage Lagoon Dam is an earth dam located in Rockingham County, New Hampshire, built in 1989. It carries a Significant hazard potential classification and has a satisfactory condition assessment.
Dam profile
NID height · 12 ft12 ft tall and 1,270 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 Exeter Sewage Lagoon Dam
Exeter Sewage Lagoon Dam is a dam in Rockingham, New Hampshire. The dam is owned by Town of Exeter Public Works (local government). It impounds the Na near Exeter.
The dam stands 12 feet tall and stretches 1,270 feet across, creates a reservoir covering 8 acres, and has a maximum storage capacity of 55 acre-feet. Completed in 1989, the structure is 37 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. The most recent inspection on record was 09/30/2020.
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Location
| State | New Hampshire |
| County | Rockingham |
| Nearest City | Exeter |
| River/Stream | Na |
| Coordinates | 42.99690, -70.94130 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 12 ft |
| Dam Height | 12 ft |
| Dam Length | 1,270 ft |
| Year Completed | 1989 (37 years old) |
Storage & Hydraulics
| NID Storage | 55 acre-ft |
| Max Storage | 55 acre-ft |
| Normal Storage | 55 acre-ft |
| Surface Area | 8 acres |
| Max Discharge | 30 cfs |
Ownership & Safety
| Purpose | Other |
| Owner | Town of Exeter Public Works |
| Owner Type | Local Government |
| Hazard Classification | Significant |
| Condition Assessment | Satisfactory |
| Last Inspection | 09/30/2020 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | NH00977 |
| Federal ID | NH00977 |
| More Info | State Dam Safety Program |