Seeley Pond Dam Reservoir Report

Last Updated: December 5, 2025

Seeley Pond Dam, located in Wilton, Connecticut, serves as a recreational spot along the Mayapple Brook.


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Summary

This concrete dam, standing at 10 feet tall and spanning 85 feet in length, offers a surface area of 2 acres for outdoor enthusiasts to enjoy. Despite its primary purpose for recreation, the dam holds a significant hazard potential and is currently assessed as being in poor condition, last inspected in August 2016.

Managed by a private owner, the dam is regulated by the Connecticut Department of Energy and Environmental Protection (DEEP) and falls under state jurisdiction for permitting, inspection, and enforcement. With an uncontrolled spillway and other controlled outlet gates, the dam poses moderate risk, prompting the need for risk management measures to be implemented. Although its condition is deemed poor, efforts to improve safety and ensure emergency preparedness may be necessary in the future to mitigate potential hazards and safeguard the surrounding community.

For water resource and climate enthusiasts, the Seeley Pond Dam presents an intriguing case study of a recreational structure with both environmental and safety considerations. As discussions around dam safety and risk management continue to evolve, the state of Connecticut and local stakeholders may need to address the maintenance and regulation of this dam to ensure the well-being of the ecosystem and community it serves.

Dam Length

85

Dam Height

10

River Or Stream

MAYAPPLE BROOK

Primary Dam Type

Concrete

Surface Area

2

Drainage Area

0.78

Outlet Gates

Other Controlled

Hazard Potential

Significant

Foundations

Rock, Soil

Nid Height

10
       
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.