Asylum Reservoir Dam #6 Reservoir Report
Last Updated: December 5, 2025
Asylum Reservoir Dam #6, also known as Hubbard Pond, is a concrete dam located in Middletown, Connecticut, with a primary purpose of water supply.
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Summary
Completed in 1954, the dam stands at a height of 28 feet and has a length of 630 feet, providing a storage capacity of 176 acre-feet and a surface area of 17.6 acres. The dam is situated on an unnamed tributary to the Connecticut River and is regulated by the Connecticut Department of Energy and Environmental Protection (DEEP).
With a significant hazard potential and a fair condition assessment as of the last inspection in February 2020, the dam is equipped with a slide (sluice gate) outlet gate and an uncontrolled spillway with a width of 46 feet. The dam's drainage area is 0.27 square miles, and it has a maximum discharge capacity of 793 cubic feet per second. Despite its moderate risk level, the dam is regularly inspected every 5 years to ensure its structural integrity and compliance with state regulations.
For water resource and climate enthusiasts, Asylum Reservoir Dam #6 serves as a vital infrastructure for water supply in the area, contributing to the management of water resources and ensuring the safety of surrounding communities. As a state-regulated structure with a history dating back to the mid-20th century, the dam exemplifies the importance of maintaining and monitoring critical infrastructure to mitigate potential risks and safeguard water security in the face of changing climate conditions.
Year Completed |
1954 |
Dam Length |
630 |
Dam Height |
28 |
River Or Stream |
UNNAMED TRIBUTARY TO CT RIVER |
Primary Dam Type |
Concrete |
Surface Area |
17.6 |
Drainage Area |
0.27 |
Nid Storage |
176 |
Outlet Gates |
Slide (sluice gate) |
Hazard Potential |
Significant |
Foundations |
Unlisted/Unknown |
Nid Height |
28 |
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.
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