Black Pond Dam Reservoir Report

Last Updated: December 18, 2025

Black Pond Dam, located in Windsor, New Hampshire, is a privately owned earth dam completed in 1926 for recreational purposes.


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Summary

The dam stands at a height of 9.85 feet and has a storage capacity of 368 acre-feet, with a maximum discharge of 364 cubic feet per second. It spans 91 feet in length and is situated on Black Pond Brook, covering a surface area of 86 acres with a drainage area of 4 square miles.

Managed by the NHDES Dam Bureau, the dam is regulated, inspected, and enforced by the state to ensure its safety and compliance with regulations. Despite being classified as having a low hazard potential, the dam is rated as fair in condition assessment, with a moderate risk level. The last inspection in October 2017 found the dam to be in satisfactory condition, with an inspection frequency of 6 years.

Overall, Black Pond Dam serves as a vital recreational resource in the area, providing water storage for various activities while being monitored closely for safety and regulatory compliance. With its historical significance and environmental impact on Black Pond Brook, the dam continues to play a crucial role in water resource management and climate resilience efforts in New Hampshire.

Year Completed

1926

Dam Length

91

Dam Height

9.85

River Or Stream

BLACK POND BROOK

Primary Dam Type

Earth

Surface Area

86

Drainage Area

4

Nid Storage

368

Hazard Potential

Low

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.