Mount Sunapee Sewage Lagoon Dam Reservoir Report
Nearby: Wildlife Pond Dam Wendall Marsh Dam
Last Updated: December 14, 2025
The Mount Sunapee Sewage Lagoon Dam, located in Newbury, New Hampshire, was completed in 1973 and stands at a height of 22 feet.
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Summary
This earthen dam, with a length of 1300 feet, serves a primary purpose of "Other" and is classified as a buttress dam type. The dam has a storage capacity of 14 acre-feet and covers a surface area of 2.8 acres.
Managed by the NHDES Dam Bureau, the dam is regulated, permitted, inspected, and enforced by the state of New Hampshire. Despite being rated as having a "Significant" hazard potential, the dam is currently in "Satisfactory" condition as of the last assessment in September 2017. The dam has no spillway and is not associated with any locks or outlet gates.
With a high risk assessment rating, the Mount Sunapee Sewage Lagoon Dam is closely monitored for any potential issues or emergencies. The dam plays a crucial role in water resource management in the area and serves as an important infrastructure for the community. Climate and water resource enthusiasts would find this dam's data and management practices of particular interest in understanding the intersection of infrastructure, climate adaptation, and water resource management.
Year Completed |
1973 |
Dam Length |
1300 |
Dam Height |
22 |
River Or Stream |
NA |
Primary Dam Type |
Earth |
Surface Area |
2.8 |
Nid Storage |
14 |
Hazard Potential |
Significant |
Foundations |
Unlisted/Unknown |
Nid Height |
22 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Dam Data Reference
Condition Assessment
SatisfactoryNo existing or potential dam safety deficiencies are recognized. Acceptable performance is expected under all loading conditions (static, hydrologic, seismic) in accordance with the minimum applicable state or federal regulatory criteria or tolerable risk guidelines.
Fair
No existing dam safety deficiencies are recognized for normal operating conditions. Rare or extreme hydrologic and/or seismic events may result in a dam safety deficiency. Risk may be in the range to take further action. Note: Rare or extreme event is defined by the regulatory agency based on their minimum
Poor A dam safety deficiency is recognized for normal operating conditions which may realistically occur. Remedial action is necessary. POOR may also be used when uncertainties exist as to critical analysis parameters which identify a potential dam safety deficiency. Investigations and studies are necessary.
Unsatisfactory
A dam safety deficiency is recognized that requires immediate or emergency remedial action for problem resolution.
Not Rated
The dam has not been inspected, is not under state or federal jurisdiction, or has been inspected but, for whatever reason, has not been rated.
Not Available
Dams for which the condition assessment is restricted to approved government users.
Hazard Potential Classification
HighDams assigned the high hazard potential classification are those where failure or mis-operation will probably cause loss of human life.
Significant
Dams assigned the significant hazard potential classification are those dams where failure or mis-operation results in no probable loss of human life but can cause economic loss, environment damage, disruption of lifeline facilities, or impact other concerns. Significant hazard potential classification dams are often located in predominantly rural or agricultural areas but could be in areas with population and significant infrastructure.
Low
Dams assigned the low hazard potential classification are those where failure or mis-operation results in no probable loss of human life and low economic and/or environmental losses. Losses are principally limited to the owner's property.
Undetermined
Dams for which a downstream hazard potential has not been designated or is not provided.
Not Available
Dams for which the downstream hazard potential is restricted to approved government users.
Mount Sunapee Sewage Lagoon Dam
Rand Pond boat launch