Union Pond Dam Reservoir Report

Last Updated: December 5, 2025

Union Pond Dam, also known as Union Pond Aka Anabel Pond, is a private water supply dam located in Stamford, Fairfield County, Connecticut.


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Summary

The dam, primarily made of masonry, stands at a height of 16 feet and spans a length of 77 feet. Its main purpose is to provide water supply, with a normal storage capacity of 0 acre-feet and a surface area of 1.5 acres. The dam is situated on the EAST BR MIANUS RIVER and falls under the regulatory oversight of the Connecticut Department of Energy and Environmental Protection (DEEP).

With a significant hazard potential and a condition assessment currently marked as "Not Rated," Union Pond Dam is subject to regular inspections every 7 years to ensure its structural integrity and safety. The dam does not have an Emergency Action Plan (EAP) in place as of the latest data update in March 2021, and additional risk management measures have not been specified. The spillway width of the dam is 30 feet, indicating its capacity to handle excess water flow during periods of high discharge.

For water resource and climate enthusiasts, Union Pond Dam presents an intriguing case study in the management and regulation of private dams for water supply purposes. Its location in a densely populated area like Stamford underscores the importance of maintaining the infrastructure's safety and resilience in the face of potential hazards. As efforts continue to monitor and assess the dam's condition, stakeholders and regulators will play a crucial role in ensuring the long-term sustainability of this vital water resource.

Dam Length

77

Dam Height

16

River Or Stream

EAST BR MIANUS RIVER

Primary Dam Type

Masonry

Surface Area

1.5

Drainage Area

2.03

Hazard Potential

Significant

Nid Height

16
       
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.