Mallard Lake Dam Reservoir Report
Last Updated: December 26, 2025
Mallard Lake Dam, located in North Stamford, Connecticut, is a privately owned structure that serves as a recreational area along the TR-RIPPONAN River.
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Summary
Built in 1939, this masonry dam stands at 11 feet tall and spans 300 feet in length, providing a storage capacity of 100 acre-feet. While primarily used for recreational purposes, the dam also helps regulate water flow and maintain the surrounding ecosystem.
Managed by the New York State Department of Environmental Conservation (NYS DEC), Mallard Lake Dam has been inspected and regulated to ensure its safety and compliance with state standards. With a low hazard potential and a moderate risk assessment rating, the dam is considered to be in satisfactory condition, although it has not been formally rated. The spillway, with a width of 10 feet, is uncontrolled, allowing excess water to flow freely in times of high discharge, minimizing the risk of overflow and potential downstream flooding.
Despite its age, Mallard Lake Dam continues to provide valuable recreational opportunities and support the local environment. As a significant piece of infrastructure in the region, it is essential for water resource and climate enthusiasts to appreciate the role this dam plays in maintaining the balance of the TR-RIPPONAN River ecosystem and the surrounding community.
Year Completed |
1939 |
Dam Length |
300 |
Dam Height |
11 |
River Or Stream |
TR-RIPPONAN RIVER |
Primary Dam Type |
Masonry |
Surface Area |
15 |
Drainage Area |
0.2 |
Nid Storage |
100 |
Hazard Potential |
Low |
Nid Height |
11 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Dam Data Reference
Condition Assessment
SatisfactoryNo 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
HighDams 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.
Mallard Lake Dam