Upper Flint Pond Dam Reservoir Report

Last Updated: December 17, 2025

Upper Flint Pond Dam is a state-regulated structure located in Tyngsborough, Massachusetts, along the Bridge Meadow Brook.


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Summary

The dam, primarily used for recreation, stands at a height of 9.5 feet with a hydraulic height of 8.5 feet and a length of 125 feet. It holds a normal storage capacity of 180 acre-feet and has a surface area of 72 acres, serving as a popular spot for outdoor enthusiasts in the Middlesex County area.

Despite its recreational appeal, Upper Flint Pond Dam has been assessed as having a poor condition and a significant hazard potential. The last inspection in September 2017 revealed the need for improvement, with a moderate risk level assigned. The dam is state-inspected, permitted, and enforced by the Department of Conservation and Recreation, ensuring its compliance with safety regulations for the surrounding community.

Given its significant hazard potential, ongoing risk assessment, and state oversight, Upper Flint Pond Dam serves as a focal point for water resource and climate enthusiasts interested in the management and maintenance of critical infrastructure. With its location in a picturesque natural setting and its importance for recreational activities, the dam presents both challenges and opportunities for sustainable water resource management in the region.

Dam Length

125

Dam Height

9.5

River Or Stream

BRIDGE MEADOW BROOK

Primary Dam Type

Masonry

Surface Area

72

Hydraulic Height

8.5

Drainage Area

7.9

Nid Storage

360

Hazard Potential

Significant

Foundations

Unlisted/Unknown

Nid Height

10
       
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.