Mountain Pond North Dam Reservoir Report

Last Updated: December 16, 2025

Mountain Pond North Dam, located in Sanbornton, New Hampshire, serves as a crucial water supply structure for the surrounding area.


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Summary

Constructed in 1913, this earth dam stands at a height of 14 feet and has a length of 97 feet, providing a storage capacity of 137 acre-feet. The dam is primarily regulated by the NHDES Dam Bureau and undergoes regular inspections to ensure its structural integrity and safety.

With a low hazard potential and fair condition assessment, Mountain Pond North Dam poses a moderate risk level that is actively managed to mitigate potential threats. Despite its age, the dam continues to fulfill its purpose of water supply efficiently, with a normal storage capacity of 100 acre-feet and a drainage area of 0.16 square miles. The dam's spillway, although uncontrolled, ensures a maximum discharge capacity of 168 cubic feet per second, further emphasizing its importance in managing water resources in the region.

Overall, Mountain Pond North Dam stands as a vital infrastructure for water resource management in Belknap County, New Hampshire. Its historical significance, coupled with its functional efficiency and regulatory oversight, underscores the importance of sustainable dam operations in maintaining a reliable water supply for the local community. As climate change impacts continue to affect water availability, the role of structures like Mountain Pond North Dam becomes increasingly crucial in ensuring water security for future generations.

Year Completed

1913

Dam Length

97

Dam Height

14

River Or Stream

TR PEMIGEWASSET RIVER

Primary Dam Type

Earth

Surface Area

24

Drainage Area

0.16

Nid Storage

137

Hazard Potential

Low

Foundations

Unlisted/Unknown

Nid Height

14
       
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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.