Derry Waste Lagoon Dam is an earth dam located in Rockingham County, New Hampshire, built in 1978. It carries a Significant hazard potential classification and has a satisfactory condition assessment.
Dam profile
NID height · 21 ft21 ft tall and 3,560 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 Derry Waste Lagoon Dam
Derry Waste Lagoon Dam is a dam in Rockingham, New Hampshire. The dam is owned by Town of Derry (local government). It impounds the Na near Derry.
The dam stands 21 feet tall and stretches 3,560 feet across, creates a reservoir covering 17 acres, and has a maximum storage capacity of 346 acre-feet. Completed in 1978, the structure is 48 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 11/12/2020.
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Location
| State | New Hampshire |
| County | Rockingham |
| Nearest City | Derry |
| River/Stream | Na |
| Coordinates | 42.86770, -71.33330 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 21 ft |
| Dam Height | 21 ft |
| Dam Length | 3,560 ft |
| Year Completed | 1978 (48 years old) |
Storage & Hydraulics
| NID Storage | 346 acre-ft |
| Max Storage | 346 acre-ft |
| Normal Storage | 346 acre-ft |
| Surface Area | 17 acres |
Ownership & Safety
| Purpose | Other |
| Owner | Town of Derry |
| Owner Type | Local Government |
| Hazard Classification | Significant |
| Condition Assessment | Satisfactory |
| Last Inspection | 11/12/2020 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | NH00961 |
| Federal ID | NH00961 |
| More Info | State Dam Safety Program |