Armstrong Pond Dam Reservoir Report

Last Updated: December 19, 2025

Armstrong Pond Dam, located in Braintree, Massachusetts, is a concrete gravity dam that stands at a height of 19.5 feet with a hydraulic height of 12.5 feet.


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Summary

The dam serves multiple purposes, including providing a storage capacity of 48 acre-feet and regulating the flow of the Monatiquot River. With a normal storage capacity of 17.2 acre-feet and a surface area of 4.4 acres, the dam plays a crucial role in managing water resources in the area.

Owned privately, Armstrong Pond Dam is regulated by the Department of Conservation and Recreation in Massachusetts. The dam has a high hazard potential and was last inspected in June 2017, with a condition assessment rating of fair. The dam's emergency action plan was last revised in August 2015, and it meets guidelines for risk management measures.

Enthusiasts interested in water resource management and climate change will find Armstrong Pond Dam to be a fascinating structure, with its unique design and important role in regulating water flow and storage in the Monatiquot River. The dam's location in Norfolk County, Massachusetts, highlights its significance in the local ecosystem and the need for continued monitoring and maintenance to ensure its safety and effectiveness in the face of changing environmental conditions.

Dam Length

86

Dam Height

19.5

River Or Stream

MONATIQUOT RIVER

Primary Dam Type

Concrete

Surface Area

4.4

Hydraulic Height

12.5

Drainage Area

25.9

Nid Storage

48

Hazard Potential

High

Foundations

Unlisted/Unknown

Nid Height

20
       
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.