Asylum Reservoir #4 Dam Reservoir Report
Last Updated: December 5, 2025
Asylum Reservoir #4 Dam, formerly known as Asylum Reservoir #1, is a concrete dam located in Middlesex, Connecticut, with a primary purpose of water supply.
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Summary
Standing at a height of 30 feet and stretching 290 feet in length, this dam has a storage capacity of 500 acre-feet and covers a surface area of 18.9 acres. The dam is under state regulation by the Department of Energy and Environmental Protection (DEEP) in Connecticut, ensuring that it meets inspection, permitting, and enforcement standards.
With a significant hazard potential but a satisfactory condition assessment as of February 2020, the Asylum Reservoir #4 Dam is considered to have a moderate risk level. It features an uncontrolled spillway with a width of 37 feet and is situated on an unnamed river or stream in Middletown. While the dam has not undergone any modifications in recent years, it is subject to regular inspections every five years to monitor its safety and integrity. Overall, this dam serves as a crucial infrastructure for water resource management in the region, highlighting the importance of its maintenance and regulatory oversight in mitigating potential risks.
Although the Asylum Reservoir #4 Dam does not have associated locks or outlet gates, its presence plays a vital role in providing water supply to the surrounding communities in Middlesex, Connecticut. The dam's construction type, core materials, and foundation specifics are documented as part of its structural information, contributing to the overall understanding of its design and functionality. As climate change continues to impact water resources, the maintenance and management of dams like Asylum Reservoir #4 are essential in ensuring water security and resilience in the face of evolving environmental challenges.
Dam Length |
290 |
Dam Height |
30 |
River Or Stream |
UNNAMED |
Primary Dam Type |
Concrete |
Surface Area |
18.9 |
Drainage Area |
0.54 |
Nid Storage |
500 |
Hazard Potential |
Significant |
Foundations |
Unlisted/Unknown |
Nid Height |
30 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Connecticut R At Middle Haddam
|
14900cfs |
Coginchaug River At Middlefield
|
60cfs |
Salmon River Near East Hampton
|
119cfs |
Quinnipiac River At Wallingford
|
147cfs |
Quinnipiac River At Southington
|
16cfs |
Eightmile R At North Plain
|
24cfs |
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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