New Wilton Reservoir Dam Reservoir Report

Last Updated: December 17, 2025

The New Wilton Reservoir Dam, also known as Stockwell Brook Dam, is a vital structure located in Wilton, New Hampshire.


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Summary

Built in 1933, this earth dam stands at a height of 24 feet and spans a length of 123 feet, serving primarily as a water supply source. The reservoir has a maximum storage capacity of 335 acre-feet and covers a surface area of 22.1 acres, drawing water from the Stockwell Brook.

Managed by the NHDES Dam Bureau and regulated by the state of New Hampshire, this dam is inspected regularly to ensure its fair condition and significant hazard potential are addressed. With a moderate risk assessment rating, the New Wilton Reservoir Dam plays a crucial role in providing water for the local community while also being mindful of potential environmental impacts and safety concerns. Enthusiasts of water resources and climate will find this dam's history, design, and management practices fascinating as they contribute to the sustainable utilization of water in the region.

Year Completed

1933

Dam Length

123

Dam Height

24

River Or Stream

STOCKWELL BROOK

Primary Dam Type

Earth

Surface Area

22.1

Drainage Area

0.4

Nid Storage

335

Hazard Potential

Significant

Foundations

Unlisted/Unknown

Nid Height

24
       
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.