Cow Pond Brook Dam Reservoir Report
Nearby: Massapoag Pond Dam Woodwards Mill Dam
Last Updated: December 17, 2025
Cow Pond Brook Dam, located in Tyngsborough, Massachusetts, is a private dam regulated by the Department of Conservation and Recreation.
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Summary
This masonry dam, with a height of 12.5 feet and a hydraulic height of 11 feet, serves primarily for recreational purposes. The dam has a storage capacity of 185 acre-feet, with a normal storage level of 119 acre-feet and a surface area of 17.7 acres.
Despite its recreational purpose, the Cow Pond Brook Dam poses a significant hazard potential with a poor condition assessment as of the last inspection in October 2014. The dam lacks an emergency action plan and has not been updated in recent years. The risk assessment for the dam is moderate, indicating a level 3 risk. With limited information on risk management measures in place, there is a need for further evaluation and potential improvements to ensure the safety and stability of the dam for both recreational users and surrounding communities.
Dam Length |
67 |
Dam Height |
12.5 |
River Or Stream |
SALMON BROOK |
Primary Dam Type |
Masonry |
Surface Area |
17.7 |
Hydraulic Height |
11 |
Drainage Area |
10.1 |
Nid Storage |
185 |
Hazard Potential |
Significant |
Foundations |
Unlisted/Unknown |
Nid Height |
13 |
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.
Cow Pond Brook Dam
Flint Pond Road, Tyngsborough