Second Connecticut Lake Dam Reservoir Report

Last Updated: December 12, 2025

Located in Pittsburg, New Hampshire, the Second Connecticut Lake Dam stands as a testament to the state's commitment to harnessing hydroelectric power.


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Summary

Completed in 1935, this earth dam boasts a height of 28 feet and a length of 568 feet, with a capacity to store up to 12,500 acre-feet of water. Situated on the Connecticut River, this dam plays a crucial role in regulating water flow, generating power, and supporting the surrounding ecosystem.

Managed by the New Hampshire Department of Environmental Services Dam Bureau, the Second Connecticut Lake Dam is subject to regular inspections and enforcement measures to ensure its structural integrity and compliance with state regulations. With a fair condition assessment and low hazard potential, this dam presents a moderate risk of failure, prompting the need for ongoing risk management and emergency preparedness. Despite its age, the Second Connecticut Lake Dam continues to serve as a vital component of New Hampshire's water resource infrastructure.

For water resource and climate enthusiasts, the Second Connecticut Lake Dam offers a fascinating glimpse into the intersection of human ingenuity and environmental stewardship. As a key player in the region's hydroelectric network, this dam symbolizes the delicate balance between energy production and ecological preservation. With its historical significance and ongoing importance in water management, the Second Connecticut Lake Dam stands as a testament to the enduring legacy of water resource development in New Hampshire.

Year Completed

1935

Dam Length

568

Dam Height

28

River Or Stream

CONNECTICUT RIVER

Primary Dam Type

Earth

Surface Area

1300

Drainage Area

45

Nid Storage

12500

Hazard Potential

Low

Foundations

Unlisted/Unknown

Nid Height

28
       
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.