Lake Armington Dam Reservoir Report

Last Updated: December 13, 2025

Lake Armington Dam, located in Piermont, New Hampshire, is a concrete structure completed in 1900 primarily for recreation purposes.


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Summary

With a height of 9 feet and a length of 220 feet, the dam controls the flow of Eastman Brook and creates a reservoir with a maximum storage capacity of 2,678 acre-feet. The dam's spillway, which is uncontrolled and 88 feet wide, helps manage potential flooding events by allowing excess water to flow safely downstream.

Managed by the New Hampshire Department of Environmental Services' Dam Bureau, the Lake Armington Dam is regulated, inspected, and enforced by the state to ensure its safety and compliance with regulations. Despite being classified with a significant hazard potential, the dam is currently assessed to be in fair condition as of November 2016. The risk assessment for the dam is moderate, with emergency action plans in place to address any potential issues that may arise. Overall, Lake Armington Dam serves as a vital structure for both water resource management and recreational activities in the area, attracting enthusiasts of water resources and climate to its picturesque surroundings.

Year Completed

1900

Dam Length

220

Dam Height

9

River Or Stream

EASTMAN BROOK

Primary Dam Type

Concrete

Surface Area

159

Drainage Area

2.6

Nid Storage

2678

Hazard Potential

Significant

Foundations

Unlisted/Unknown

Nid Height

9
       
Seasonal Comparison

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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.