Upper Westborough Reservoir Dam Reservoir Report
Last Updated: December 15, 2025
The Upper Westborough Reservoir Dam in Worcester, Massachusetts, stands as a vital structure for water supply, completed in 1887 and boasting a capacity of 850 acre-feet.
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Summary
This earth dam, primarily buttress in design, spans 300 feet in length and reaches a height of 15 feet, with a significant hazard potential but a fair condition assessment as of 2013. With a controlled spillway and serving the purpose of water supply, this dam on Piccadilly Brook plays a crucial role in the local community.
Managed by the Department of Conservation and Recreation, the Upper Westborough Reservoir Dam is subject to state regulation and oversight, including inspection and enforcement to ensure its safety and functionality. Despite its age, the dam remains structurally sound and reliable, with a moderate risk assessment rating. Located in Westborough, this dam is a key component of the local water infrastructure, providing storage for 830 acre-feet of water and serving as a critical resource in times of need.
For water resource and climate enthusiasts, the Upper Westborough Reservoir Dam presents a fascinating case study in the management and maintenance of essential infrastructure. With its historical significance, environmental impact, and role in water supply, this dam showcases the intersection of engineering, conservation, and community needs. As efforts continue to ensure its safety and effectiveness, the Upper Westborough Reservoir Dam stands as a testament to the importance of sustainable water management practices in the face of evolving climate challenges.
Year Completed |
1887 |
Dam Length |
300 |
Dam Height |
15 |
River Or Stream |
PICCADILLY BROOK |
Primary Dam Type |
Earth |
Surface Area |
60 |
Hydraulic Height |
10 |
Drainage Area |
1.16 |
Nid Storage |
850 |
Hazard Potential |
Significant |
Foundations |
Unlisted/Unknown |
Nid Height |
15 |
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.
Upper Westborough Reservoir Dam
Wood Street 291-299, Hopkinton