Sargent Center Infiltration Lagoon Reservoir Report

Last Updated: December 19, 2025

The Sargent Center Infiltration Lagoon in Hancock, New Hampshire is a privately owned structure regulated by the NHDES Dam Bureau.


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Summary

This Earth dam stands at a height of 11.1 feet and is primarily used for infiltration purposes. With a storage capacity of 5 acre-feet and a normal storage of 2.5 acre-feet, this lagoon plays a crucial role in managing water resources in the area.

Despite not having a spillway, this lagoon has a significant hazard potential and is considered to have a high risk level according to assessments. The condition assessment is not rated, indicating the need for further evaluation. With a last inspection date in October 2020 and an inspection frequency of 4 times a year, it is clear that the safety and functionality of the Sargent Center Infiltration Lagoon are regularly monitored to ensure its effectiveness in water management and climate adaptation efforts in the region.

Located in close proximity to the New England and New York Districts of the US Army Corps of Engineers, this lagoon serves as a vital piece of infrastructure in the water resource management network. As climate change continues to impact water availability and quality, structures like the Sargent Center Infiltration Lagoon play a crucial role in ensuring sustainable water use and resilience to changing climate conditions in the Hillsborough County, New Hampshire area.

Dam Length

800

Dam Height

11.1

River Or Stream

NA

Primary Dam Type

Earth

Surface Area

1

Nid Storage

5

Hazard Potential

Significant

Foundations

Unlisted/Unknown

Nid Height

11
       
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.