Rochester Sewage Lagoon Dam is an earth dam located in Strafford County, New Hampshire, built in 1980. It carries a Significant hazard potential classification and has a satisfactory condition assessment.
Dam profile
NID height · 10 ft10 ft tall and 4,300 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 Rochester Sewage Lagoon Dam
Rochester Sewage Lagoon Dam is a dam in Strafford, New Hampshire. The dam is owned by City of Rochester (local government). It impounds the Na near Rochester.
The dam stands 10 feet tall and stretches 4,300 feet across, creates a reservoir covering 23 acres, and has a maximum storage capacity of 265 acre-feet. Completed in 1980, the structure is 46 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 09/16/2022.
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Location
| State | New Hampshire |
| County | Strafford |
| Nearest City | Rochester |
| River/Stream | Na |
| Coordinates | 43.25910, -70.96690 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 10 ft |
| Dam Height | 10 ft |
| Dam Length | 4,300 ft |
| Year Completed | 1980 (46 years old) |
Storage & Hydraulics
| NID Storage | 265 acre-ft |
| Max Storage | 265 acre-ft |
| Normal Storage | 265 acre-ft |
| Surface Area | 23 acres |
Ownership & Safety
| Purpose | Other |
| Owner | City of Rochester |
| Owner Type | Local Government |
| Hazard Classification | Significant |
| Condition Assessment | Satisfactory |
| Last Inspection | 09/16/2022 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | NH00571 |
| Federal ID | NH00571 |
| More Info | State Dam Safety Program |