Lake Kanasatka Dam Reservoir Report

Last Updated: December 16, 2025

The Lake Kanasatka Dam, also known as Long Pond Dam, is a state-owned structure located in Moultonborough, Carroll County, New Hampshire.


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Summary

Completed in 1933, this earth dam stands at a height of 17 feet and spans a length of 240 feet, serving primarily for recreational purposes. With a storage capacity of 5640 acre-feet and a drainage area of 7.3 square miles, the dam regulates the flow of the Trout River into Lake Winnipesaukee and covers a surface area of 392 acres.

Despite its significant hazard potential and poor condition assessment, the Lake Kanasatka Dam is regularly inspected and maintained by the New Hampshire Department of Environmental Services Dam Bureau. The dam's spillway, with a width of 7 feet, is of the uncontrolled type. While it currently meets moderate risk levels, with a risk assessment rating of 3, there is a need for ongoing risk management measures to ensure the safety and integrity of this vital water resource infrastructure for both recreational and environmental enthusiasts in the region.

Year Completed

1933

Dam Length

240

Dam Height

17

River Or Stream

TR LAKE WINNIPESAUKEE

Primary Dam Type

Earth

Surface Area

392

Drainage Area

7.3

Nid Storage

5640

Hazard Potential

Significant

Foundations

Unlisted/Unknown

Nid Height

17
       
Seasonal Comparison

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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.