Municipal Sewage Lagoon 2 Reservoir Report

Last Updated: December 14, 2025

Municipal Sewage Lagoon 2, located in Newport, New Hampshire, is a significant earth dam that was completed in 1968.


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Summary

With a height of 11 feet and a length of 1260 feet, this lagoon provides a storage capacity of 22 million gallons of sewage. Despite its fair condition assessment, the dam is regulated by the NHDES DAM BUREAU and is subject to regular inspections, enforcement, and permitting processes.

This lagoon serves as an essential infrastructure for the local government, with a primary purpose designated as "Other." While it does not have a spillway, outlet gates, or locks, it is crucial for managing wastewater in the area. The hazard potential is rated as significant, with a high risk assessment level (2), highlighting the importance of proper maintenance and risk management measures to ensure the safety and functionality of the structure.

As water resource and climate enthusiasts, understanding the role of Municipal Sewage Lagoon 2 in the local community is crucial for sustainable water management practices. With its strategic location and significant storage capacity, this dam plays a vital role in protecting the environment and public health through effective sewage treatment and disposal. Continued oversight and maintenance will be essential to address any potential risks and ensure the long-term integrity of this important infrastructure.

Year Completed

1968

Dam Length

1260

Dam Height

11

River Or Stream

NA

Primary Dam Type

Earth

Surface Area

2.2

Nid Storage

22

Hazard Potential

Significant

Foundations

Unlisted/Unknown

Nid Height

11
       
Seasonal Comparison

Weather Forecast

Dam Data Reference

Condition Assessment

Satisfactory
No 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

High
Dams 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.