Aspetuck Reservoir Dam Reservoir Report
Last Updated: December 5, 2025
Located in Westport, Connecticut, the Aspetuck Reservoir Dam stands as a vital structure for water supply, completed in 1913.
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Summary
This earth dam spans 1,180 feet with a height of 11 feet, creating a storage capacity of 413 acre-feet. Serving as a key component in the local water infrastructure, the dam regulates the flow of the Aspetuck River and provides 202 acre-feet of normal storage.
Managed by the state regulatory agency DEEP, the dam has been deemed to have a significant hazard potential, although its condition assessment stands at fair. With a spillway width of 500 feet and uncontrolled spillway type, the dam's risk assessment is moderate. Regular inspections are conducted, with the last assessment in June 2019 and a scheduled frequency of every 5 years.
Enthusiasts of water resources and climate will find the Aspetuck Reservoir Dam to be a fascinating structure, balancing the needs of water supply with the challenges of maintaining safety and integrity. The dam plays a crucial role in the region's water management system, highlighting the importance of infrastructure resilience in the face of changing environmental conditions.
Year Completed |
1913 |
Dam Length |
1180 |
Dam Height |
11 |
River Or Stream |
ASPETUCK RIVER |
Primary Dam Type |
Earth |
Surface Area |
63 |
Drainage Area |
17.6 |
Nid Storage |
413 |
Hazard Potential |
Significant |
Foundations |
Unlisted/Unknown |
Nid Height |
11 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Saugatuck R Nr Westport
|
32cfs |
Saugatuck River Near Redding
|
22cfs |
Mill R Nr Fairfield
|
65cfs |
Sasco Brook Near Southport
|
4cfs |
Rooster River At Fairfield
|
3cfs |
Norwalk R At South Wilton
|
23cfs |
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.
Aspetuck Reservoir Dam