Hapgood Pond Dam Reservoir Report

Last Updated: December 15, 2025

Hapgood Pond Dam, located in Londonderry, Vermont, is a federal-owned structure managed by the USDA Forest Service.


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Summary

Built in 1980, the dam serves as a water supply source and is situated on Flood Brook, with a height of 20 feet and a length of 128 feet. With a normal storage capacity of 43 acre-feet and a maximum discharge of 318 cubic feet per second, the dam plays a crucial role in managing water resources in the region.

Although the dam has a low hazard potential and is not currently rated for its condition, it underwent structural modifications in 2000 to ensure its continued safety and functionality. The last inspection of the dam took place in May 2014, with an inspection frequency of 10 years. The risk assessment for Hapgood Pond Dam indicates a moderate risk level (3), prompting the need for ongoing monitoring and potential risk management measures to safeguard both the dam and the surrounding area from potential hazards.

Enthusiasts of water resources and climate change will find Hapgood Pond Dam to be a fascinating case study in dam infrastructure management. With its primary purpose of water supply and its location in a picturesque natural setting, the dam represents a balance between human needs and environmental stewardship. As discussions around climate resilience and water management continue to evolve, Hapgood Pond Dam serves as a tangible example of the intersection between infrastructure, sustainability, and risk management in the face of changing environmental conditions.

Years Modified

2000 - Structural

Year Completed

1980

Dam Length

128

Dam Height

20

River Or Stream

FLOOD BROOK

Primary Dam Type

Other

Surface Area

8

Hydraulic Height

14

Drainage Area

4

Nid Storage

86

Structural Height

27

Hazard Potential

Low

Nid Height

27
       
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.