Swansea Dam Reservoir Report
Last Updated: December 17, 2025
Swansea Dam, located in Bristol, Massachusetts, is a masonry dam with a primary purpose of recreation.
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Summary
Standing at a height of 13 feet with a hydraulic height of 10.3 feet, the dam overlooks Lewin Brook and provides a serene backdrop for outdoor enthusiasts. With a storage capacity of 113 acre-feet and a surface area of 0.02 square miles, the dam offers a tranquil setting for visitors to enjoy water-based activities.
State-regulated by the Department of Conservation and Recreation, Swansea Dam holds significant hazard potential but is currently assessed to be in satisfactory condition. The dam's spillway, of uncontrolled type, serves as a safety feature to prevent overtopping during periods of high water flow. With a drainage area of 3.53 square miles, the dam plays a crucial role in managing water levels and ensuring the safety of local communities downstream.
Despite its moderate risk assessment, Swansea Dam continues to attract visitors seeking recreational opportunities in a natural setting. With ongoing inspections and enforcement measures in place, the dam remains a well-maintained structure that contributes to the conservation and enjoyment of water resources in the area.
Dam Length |
105 |
Dam Height |
13 |
River Or Stream |
LEWIN BROOK |
Primary Dam Type |
Masonry |
Surface Area |
0.02 |
Hydraulic Height |
10.3 |
Drainage Area |
3.53 |
Nid Storage |
113 |
Hazard Potential |
Significant |
Foundations |
Unlisted/Unknown |
Nid Height |
13 |
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.
Swansea Dam
Brownell Street 2, Fall River